Cryptography by Stanford University | 1337 Institute of Technology

Warning (2): simplexml_load_file(http://gdata.youtube.com/feeds/api/videos?q=0t1oCt88XJk): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
 [APP/View/Helper/CommonHelper.php, line 218]Code Context$url = array(
	'host' => '*****',
	'scheme' => 'http',
	'path' => '/watch',
	'query' => 'v=0t1oCt88XJk'
)
$vid = null
$output = array(
	'v' => '0t1oCt88XJk'
)
$video_id = '0t1oCt88XJk'
$data = array(
	'video_type' => 'youtube',
	'video_id' => '0t1oCt88XJk'
)
$http_response_header = array(
	(int) 0 => 'HTTP/1.0 404 Not Found',
	(int) 1 => 'Content-Type: text/html; charset=UTF-8',
	(int) 2 => 'Referrer-Policy: no-referrer',
	(int) 3 => 'Content-Length: 1577',
	(int) 4 => 'Date: Fri, 15 Jan 2021 17:18:44 GMT'
)
simplexml_load_file - [internal], line ??
CommonHelper::video_info() - APP/View/Helper/CommonHelper.php, line 218
include - APP/View/Courses/view.ctp, line 33
View::_evaluate() - CORE/Cake/View/View.php, line 921
View::_render() - CORE/Cake/View/View.php, line 884
View::render() - CORE/Cake/View/View.php, line 476
Controller::render() - CORE/Cake/Controller/Controller.php, line 956
CoursesController::view() - APP/Controller/CoursesController.php, line 241
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 186
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 161
[main] - APP/webroot/index.php, line 94

Warning (2): simplexml_load_file() [http://php.net/function.simplexml-load-file]: I/O warning : failed to load external entity "http://gdata.youtube.com/feeds/api/videos?q=0t1oCt88XJk" [APP/View/Helper/CommonHelper.php, line 218]Code Context$url = array(
	'host' => '*****',
	'scheme' => 'http',
	'path' => '/watch',
	'query' => 'v=0t1oCt88XJk'
)
$vid = null
$output = array(
	'v' => '0t1oCt88XJk'
)
$video_id = '0t1oCt88XJk'
$data = array(
	'video_type' => 'youtube',
	'video_id' => '0t1oCt88XJk'
)
$http_response_header = array(
	(int) 0 => 'HTTP/1.0 404 Not Found',
	(int) 1 => 'Content-Type: text/html; charset=UTF-8',
	(int) 2 => 'Referrer-Policy: no-referrer',
	(int) 3 => 'Content-Length: 1577',
	(int) 4 => 'Date: Fri, 15 Jan 2021 17:18:44 GMT'
)
simplexml_load_file - [internal], line ??
CommonHelper::video_info() - APP/View/Helper/CommonHelper.php, line 218
include - APP/View/Courses/view.ctp, line 33
View::_evaluate() - CORE/Cake/View/View.php, line 921
View::_render() - CORE/Cake/View/View.php, line 884
View::render() - CORE/Cake/View/View.php, line 476
Controller::render() - CORE/Cake/Controller/Controller.php, line 956
CoursesController::view() - APP/Controller/CoursesController.php, line 241
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 186
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 161
[main] - APP/webroot/index.php, line 94

Notice (8): Trying to get property of non-object [APP/View/Helper/CommonHelper.php, line 220]Code Context                $xml = simplexml_load_file("http://gdata.youtube.com/feeds/api/videos?q=$video_id");
                 
                foreach ($xml->entry as $entry) {
$url = array(
	'host' => '*****',
	'scheme' => 'http',
	'path' => '/watch',
	'query' => 'v=0t1oCt88XJk'
)
$vid = null
$output = array(
	'v' => '0t1oCt88XJk'
)
$video_id = '0t1oCt88XJk'
$data = array(
	'video_type' => 'youtube',
	'video_id' => '0t1oCt88XJk'
)
$http_response_header = array(
	(int) 0 => 'HTTP/1.0 404 Not Found',
	(int) 1 => 'Content-Type: text/html; charset=UTF-8',
	(int) 2 => 'Referrer-Policy: no-referrer',
	(int) 3 => 'Content-Length: 1577',
	(int) 4 => 'Date: Fri, 15 Jan 2021 17:18:44 GMT'
)
$xml = false
CommonHelper::video_info() - APP/View/Helper/CommonHelper.php, line 220
include - APP/View/Courses/view.ctp, line 33
View::_evaluate() - CORE/Cake/View/View.php, line 921
View::_render() - CORE/Cake/View/View.php, line 884
View::render() - CORE/Cake/View/View.php, line 476
Controller::render() - CORE/Cake/Controller/Controller.php, line 956
CoursesController::view() - APP/Controller/CoursesController.php, line 241
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 186
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 161
[main] - APP/webroot/index.php, line 94

Warning (2): Invalid argument supplied for foreach() [APP/View/Helper/CommonHelper.php, line 220]Code Context                $xml = simplexml_load_file("http://gdata.youtube.com/feeds/api/videos?q=$video_id");
                 
                foreach ($xml->entry as $entry) {
$url = array(
	'host' => '*****',
	'scheme' => 'http',
	'path' => '/watch',
	'query' => 'v=0t1oCt88XJk'
)
$vid = null
$output = array(
	'v' => '0t1oCt88XJk'
)
$video_id = '0t1oCt88XJk'
$data = array(
	'video_type' => 'youtube',
	'video_id' => '0t1oCt88XJk'
)
$http_response_header = array(
	(int) 0 => 'HTTP/1.0 404 Not Found',
	(int) 1 => 'Content-Type: text/html; charset=UTF-8',
	(int) 2 => 'Referrer-Policy: no-referrer',
	(int) 3 => 'Content-Length: 1577',
	(int) 4 => 'Date: Fri, 15 Jan 2021 17:18:44 GMT'
)
$xml = false
CommonHelper::video_info() - APP/View/Helper/CommonHelper.php, line 220
include - APP/View/Courses/view.ctp, line 33
View::_evaluate() - CORE/Cake/View/View.php, line 921
View::_render() - CORE/Cake/View/View.php, line 884
View::render() - CORE/Cake/View/View.php, line 476
Controller::render() - CORE/Cake/Controller/Controller.php, line 956
CoursesController::view() - APP/Controller/CoursesController.php, line 241
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 186
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 161
[main] - APP/webroot/index.php, line 94

Cryptography

Cryptography is an indispensable tool for protecting information in computer systems.
Take This Course Free

by Stanford University

Cryptography is an indispensable tool for protecting information in computer systems. This course explains the inner workings of cryptographic primitives and how to correctly use them. Students will learn how to reason about the security of cryptographic constructions and how to apply this knowledge to real-world applications. The course begins with a detailed discussion of how two parties who have a shared secret key can communicate securely when a powerful adversary eavesdrops and tampers with traffic. We will examine many deployed protocols and analyze mistakes in existing systems. The second half of the course discusses public-key techniques that let two or more parties generate a shared secret key. We will cover the relevant number theory and discuss public-key encryption and basic key-exchange. Throughout the course students will be exposed to many exciting open problems in the field.

Source: Stanford University

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(default) 22 queries took 5 ms
Nr	Query	Affected	Num. rows	Took (ms)
1	SELECT `Advertiser`.`id`, `Advertiser`.`title`, `Advertiser`.`description`, `Advertiser`.`link`, `Advertiser`.`button_title`, `Advertiser`.`logo`, `Advertiser`.`logo_blob`, `Advertiser`.`status`, `Advertiser`.`created`, `Advertiser`.`modified` FROM `1337iot`.`advertisers` AS `Advertiser` WHERE `status` = 1 ORDER BY rand() ASC LIMIT 1	0	0	1
2	SELECT `Configuration`.`id`, `Configuration`.`heading`, `Configuration`.`default_header`, `Configuration`.`value`, `Configuration`.`created`, `Configuration`.`modified` FROM `1337iot`.`configurations` AS `Configuration` WHERE 1 = 1	28	28	0
3	SELECT `Cmspages`.`name`, `Cmspages`.`seourl` FROM `1337iot`.`cmspages` AS `Cmspages` WHERE `Cmspages`.`showinfooter` = '1' AND `Cmspages`.`status` = '1' ORDER BY `Cmspages`.`name` ASC	5	5	0
4	SELECT `UserViewCourse`.`id`, `UserViewCourse`.`user_id` FROM `1337iot`.`user_view_courses` AS `UserViewCourse` WHERE `UserViewCourse`.`course_id` = 52	10	10	0
5	SELECT distinct(`UserViewCourse`.`course_id`), `Course`.`id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`price`, `Course`.`coverimage`, `Course`.`user_id`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `UserViewCourse`.`course_id`) AS `UserViewCourse__students`, (select avg(rating) rating from course_reviews CourseReview where `CourseReview`.`course_id` = `UserViewCourse`.`course_id`) AS `UserViewCourse__review`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `UserViewCourse__name` FROM `1337iot`.`user_view_courses` AS `UserViewCourse` LEFT JOIN `1337iot`.`users` AS `User` ON (`UserViewCourse`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`UserViewCourse`.`course_id` = `Course`.`id`) WHERE `UserViewCourse`.`user_id` in (24036,24359,22320,24810,26148,28430,187,31817,25887,23538) LIMIT 3	3	3	1
6	SELECT `CourseReview`.`rating`, `CourseReview`.`Created`, `CourseReview`.`review_text`, `Userdetail`.`first_name`, `Userdetail`.`last_name`, `Userdetail`.`image`, `Userdetail`.`user_id`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` =52) AS `CourseReview__avgrating` FROM `1337iot`.`course_reviews` AS `CourseReview` LEFT JOIN `1337iot`.`userdetails` AS `Userdetail` ON (`Userdetail`.`user_id` = `CourseReview`.`user_id`) WHERE `CourseReview`.`course_id` = 52 LIMIT 3	0	0	0
7	SELECT COUNT(*) AS `count` FROM `1337iot`.`course_reviews` AS `CourseReview` LEFT JOIN `1337iot`.`users` AS `User` ON (`CourseReview`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`CourseReview`.`course_id` = `Course`.`id`) WHERE `CourseReview`.`course_id` = 52	1	1	0
8	SELECT `CourseSection`.`id`, `CourseSection`.`course_id`, `CourseSection`.`heading`, `CourseSection`.`section_index`, `CourseSection`.`prev`, `CourseSection`.`created`, `CourseSection`.`modified` FROM `1337iot`.`course_sections` AS `CourseSection` WHERE `CourseSection`.`course_id` = 52	12	12	0
9	SELECT `CourseLecture`.`id`, `CourseLecture`.`course_id`, `CourseLecture`.`course_section_id`, `CourseLecture`.`heading`, `CourseLecture`.`course_description`, `CourseLecture`.`content`, `CourseLecture`.`content_type`, `CourseLecture`.`content_title`, `CourseLecture`.`content_external_link`, `CourseLecture`.`content_source`, `CourseLecture`.`supplimentary_material`, `CourseLecture`.`lecture_index`, `CourseLecture`.`prev`, `CourseLecture`.`live_status`, `CourseLecture`.`file1_upload`, `CourseLecture`.`file2_upload`, `CourseLecture`.`created`, `CourseLecture`.`modified` FROM `1337iot`.`course_lectures` AS `CourseLecture` WHERE `CourseLecture`.`course_section_id` IN (73, 75, 76, 77, 78, 80, 82, 85, 86, 87, 88, 89)	65	65	0
10	SELECT `CourseQuiz`.`id`, `CourseQuiz`.`course_section_id`, `CourseQuiz`.`course_lecture_id`, `CourseQuiz`.`heading`, `CourseQuiz`.`content`, `CourseQuiz`.`publish`, `CourseQuiz`.`created`, `CourseQuiz`.`modified` FROM `1337iot`.`course_quizzes` AS `CourseQuiz` WHERE `CourseQuiz`.`course_section_id` IN (73, 75, 76, 77, 78, 80, 82, 85, 86, 87, 88, 89)	0	0	0
11	SELECT `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, `InstructionLevel`.`id`, `InstructionLevel`.`title`, `InstructionLevel`.`created`, `InstructionLevel`.`modified` FROM `1337iot`.`courses` AS `Course` LEFT JOIN `1337iot`.`instruction_levels` AS `InstructionLevel` ON (`Course`.`instruction_level_id` = `InstructionLevel`.`id`) WHERE `Course`.`id` = 52 AND `Course`.`status` = '1' LIMIT 1	1	1	0
12	SELECT `CourseAudience`.`id`, `CourseAudience`.`course_id`, `CourseAudience`.`title`, `CourseAudience`.`created`, `CourseAudience`.`modified` FROM `1337iot`.`course_audience` AS `CourseAudience` WHERE `CourseAudience`.`course_id` = (52)	0	0	0
13	SELECT `CourseGoal`.`id`, `CourseGoal`.`course_id`, `CourseGoal`.`title`, `CourseGoal`.`created`, `CourseGoal`.`modified` FROM `1337iot`.`course_goals` AS `CourseGoal` WHERE `CourseGoal`.`course_id` = (52)	0	0	0
14	SELECT `CourseRequirement`.`id`, `CourseRequirement`.`course_id`, `CourseRequirement`.`title`, `CourseRequirement`.`created`, `CourseRequirement`.`modified` FROM `1337iot`.`course_requirements` AS `CourseRequirement` WHERE `CourseRequirement`.`course_id` = (52)	0	0	0
15	SELECT `Userdetail`.*, `User`.`id` FROM `1337iot`.`users` AS `User` LEFT JOIN `1337iot`.`userdetails` AS `Userdetail` ON (`Userdetail`.`user_id` = `User`.`id`) WHERE `User`.`id` = 18 LIMIT 1	1	1	0
16	SELECT `Course`.`id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`coverimage`, `Course`.`summary`, `Course`.`price`, `Course`.`user_id`, (select count() as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name` FROM `1337iot`.`courses` AS `Course` WHERE `Course`.`user_id` = 18 AND `Course`.`publishstatus` = 'Publish' ORDER BY (select count() as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) desc LIMIT 2	2	2	0
17	SELECT COUNT(*) AS `count` FROM `1337iot`.`courses` AS `Course` LEFT JOIN `1337iot`.`users` AS `User` ON (`Course`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`languages` AS `Language` ON (`Course`.`language_id` = `Language`.`id`) LEFT JOIN `1337iot`.`instruction_levels` AS `InstructionLevel` ON (`Course`.`instruction_level_id` = `InstructionLevel`.`id`) WHERE `Course`.`user_id` = 18 AND `Course`.`publishstatus` = 'Publish'	1	1	0
18	SELECT `Userdetail`.`user_id`, `Userdetail`.`first_name`, `Userdetail`.`last_name`, `Userdetail`.`image` FROM `1337iot`.`user_learning_courses` AS `UserLearningCourse` Inner JOIN `1337iot`.`bundles` AS `Bundle` ON (`Bundle`.`status` = 1 AND `UserLearningCourse`.`bundle_id` = `Bundle`.`id`) LEFT JOIN `1337iot`.`userdetails` AS `Userdetail` ON (`UserLearningCourse`.`user_id` = `Userdetail`.`id`) WHERE `UserLearningCourse`.`course_id` = 52 LIMIT 14	14	14	0
19	SELECT COUNT(*) AS `count` FROM `1337iot`.`user_learning_courses` AS `UserLearningCourse` LEFT JOIN `1337iot`.`users` AS `User` ON (`UserLearningCourse`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`UserLearningCourse`.`course_id` = `Course`.`id`) Inner JOIN `1337iot`.`bundles` AS `Bundle` ON (`Bundle`.`status` = 1 AND `UserLearningCourse`.`bundle_id` = `Bundle`.`id`) WHERE `UserLearningCourse`.`course_id` = 52	1	1	1
20	SELECT `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name` FROM `1337iot`.`courses` AS `Course` WHERE `Course`.`id` = 52 AND `Course`.`publishstatus` = 'Publish' LIMIT 1	1	1	0
21	SELECT `UserLearningCourse`.`id`, `UserLearningCourse`.`user_id`, `UserLearningCourse`.`course_id`, `UserLearningCourse`.`completed`, `UserLearningCourse`.`created`, `UserLearningCourse`.`bundle_id`, `UserLearningCourse`.`modified`, `UserLearningCourse`.`payerid`, `User`.`id`, `User`.`fbid`, `User`.`username`, `User`.`password`, `User`.`remembertoken`, `User`.`loginfrom`, `User`.`status`, `User`.`passwordstatus`, `User`.`newsletter`, `User`.`profiletype`, `User`.`created`, `User`.`modified`, `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name`, `Bundle`.`id`, `Bundle`.`title`, `Bundle`.`is_expired`, `Bundle`.`status`, `Bundle`.`expired_on`, `Bundle`.`created`, `Bundle`.`modified` FROM `1337iot`.`user_learning_courses` AS `UserLearningCourse` LEFT JOIN `1337iot`.`users` AS `User` ON (`UserLearningCourse`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`UserLearningCourse`.`course_id` = `Course`.`id`) Inner JOIN `1337iot`.`bundles` AS `Bundle` ON (`Bundle`.`status` = 1 AND `UserLearningCourse`.`bundle_id` = `Bundle`.`id`) WHERE `UserLearningCourse`.`user_id` IS NULL AND `UserLearningCourse`.`course_id` = 52 LIMIT 1	0	0	1
22	SELECT `CourseUserQuestion`.`id`, `CourseUserQuestion`.`user_id`, `CourseUserQuestion`.`course_id`, `CourseUserQuestion`.`course_lecture_id`, `CourseUserQuestion`.`heading`, `CourseUserQuestion`.`question`, `CourseUserQuestion`.`created`, `CourseUserQuestion`.`modified`, (select `Userdetail`.`first_name` from userdetails Userdetail where `Userdetail`.`user_id` = `CourseUserQuestion`.`user_id`) AS `CourseUserQuestion__firstname`, (select `Userdetail`.`last_name` from userdetails Userdetail where `Userdetail`.`user_id` = `CourseUserQuestion`.`user_id`) AS `CourseUserQuestion__lastname`, (select lecture_index from course_lectures where `course_lectures`.`id` = `CourseUserQuestion`.`course_lecture_id`) AS `CourseUserQuestion__lectureindex`, `User`.`id`, `User`.`fbid`, `User`.`username`, `User`.`password`, `User`.`remembertoken`, `User`.`loginfrom`, `User`.`status`, `User`.`passwordstatus`, `User`.`newsletter`, `User`.`profiletype`, `User`.`created`, `User`.`modified`, `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name`, `CourseLecture`.`id`, `CourseLecture`.`course_id`, `CourseLecture`.`course_section_id`, `CourseLecture`.`heading`, `CourseLecture`.`course_description`, `CourseLecture`.`content`, `CourseLecture`.`content_type`, `CourseLecture`.`content_title`, `CourseLecture`.`content_external_link`, `CourseLecture`.`content_source`, `CourseLecture`.`supplimentary_material`, `CourseLecture`.`lecture_index`, `CourseLecture`.`prev`, `CourseLecture`.`live_status`, `CourseLecture`.`file1_upload`, `CourseLecture`.`file2_upload`, `CourseLecture`.`created`, `CourseLecture`.`modified` FROM `1337iot`.`course_user_questions` AS `CourseUserQuestion` LEFT JOIN `1337iot`.`users` AS `User` ON (`CourseUserQuestion`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`CourseUserQuestion`.`course_id` = `Course`.`id`) LEFT JOIN `1337iot`.`course_lectures` AS `CourseLecture` ON (`CourseUserQuestion`.`course_lecture_id` = `CourseLecture`.`id`) WHERE `CourseUserQuestion`.`course_id` = 52 AND `CourseUserQuestion`.`user_id` IS NULL ORDER BY `CourseUserQuestion`.`created` desc	0	0	1

(default) 22 queries took 5 ms

Query

Error

Affected

Num. rows

Took (ms)

SELECT `Advertiser`.`id`, `Advertiser`.`title`, `Advertiser`.`description`, `Advertiser`.`link`, `Advertiser`.`button_title`, `Advertiser`.`logo`, `Advertiser`.`logo_blob`, `Advertiser`.`status`, `Advertiser`.`created`, `Advertiser`.`modified` FROM `1337iot`.`advertisers` AS `Advertiser` WHERE `status` = 1 ORDER BY rand() ASC LIMIT 1

SELECT `Configuration`.`id`, `Configuration`.`heading`, `Configuration`.`default_header`, `Configuration`.`value`, `Configuration`.`created`, `Configuration`.`modified` FROM `1337iot`.`configurations` AS `Configuration` WHERE 1 = 1

SELECT `Cmspages`.`name`, `Cmspages`.`seourl` FROM `1337iot`.`cmspages` AS `Cmspages` WHERE `Cmspages`.`showinfooter` = '1' AND `Cmspages`.`status` = '1' ORDER BY `Cmspages`.`name` ASC

SELECT `UserViewCourse`.`id`, `UserViewCourse`.`user_id` FROM `1337iot`.`user_view_courses` AS `UserViewCourse` WHERE `UserViewCourse`.`course_id` = 52

SELECT distinct(`UserViewCourse`.`course_id`), `Course`.`id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`price`, `Course`.`coverimage`, `Course`.`user_id`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `UserViewCourse`.`course_id`) AS `UserViewCourse__students`, (select avg(rating) rating from course_reviews CourseReview where `CourseReview`.`course_id` = `UserViewCourse`.`course_id`) AS `UserViewCourse__review`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `UserViewCourse__name` FROM `1337iot`.`user_view_courses` AS `UserViewCourse` LEFT JOIN `1337iot`.`users` AS `User` ON (`UserViewCourse`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`UserViewCourse`.`course_id` = `Course`.`id`) WHERE `UserViewCourse`.`user_id` in (24036,24359,22320,24810,26148,28430,187,31817,25887,23538) LIMIT 3

SELECT `CourseReview`.`rating`, `CourseReview`.`Created`, `CourseReview`.`review_text`, `Userdetail`.`first_name`, `Userdetail`.`last_name`, `Userdetail`.`image`, `Userdetail`.`user_id`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` =52) AS `CourseReview__avgrating` FROM `1337iot`.`course_reviews` AS `CourseReview` LEFT JOIN `1337iot`.`userdetails` AS `Userdetail` ON (`Userdetail`.`user_id` = `CourseReview`.`user_id`) WHERE `CourseReview`.`course_id` = 52 LIMIT 3

SELECT COUNT(*) AS `count` FROM `1337iot`.`course_reviews` AS `CourseReview` LEFT JOIN `1337iot`.`users` AS `User` ON (`CourseReview`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`CourseReview`.`course_id` = `Course`.`id`) WHERE `CourseReview`.`course_id` = 52

SELECT `CourseSection`.`id`, `CourseSection`.`course_id`, `CourseSection`.`heading`, `CourseSection`.`section_index`, `CourseSection`.`prev`, `CourseSection`.`created`, `CourseSection`.`modified` FROM `1337iot`.`course_sections` AS `CourseSection` WHERE `CourseSection`.`course_id` = 52

SELECT `CourseLecture`.`id`, `CourseLecture`.`course_id`, `CourseLecture`.`course_section_id`, `CourseLecture`.`heading`, `CourseLecture`.`course_description`, `CourseLecture`.`content`, `CourseLecture`.`content_type`, `CourseLecture`.`content_title`, `CourseLecture`.`content_external_link`, `CourseLecture`.`content_source`, `CourseLecture`.`supplimentary_material`, `CourseLecture`.`lecture_index`, `CourseLecture`.`prev`, `CourseLecture`.`live_status`, `CourseLecture`.`file1_upload`, `CourseLecture`.`file2_upload`, `CourseLecture`.`created`, `CourseLecture`.`modified` FROM `1337iot`.`course_lectures` AS `CourseLecture` WHERE `CourseLecture`.`course_section_id` IN (73, 75, 76, 77, 78, 80, 82, 85, 86, 87, 88, 89)

SELECT `CourseQuiz`.`id`, `CourseQuiz`.`course_section_id`, `CourseQuiz`.`course_lecture_id`, `CourseQuiz`.`heading`, `CourseQuiz`.`content`, `CourseQuiz`.`publish`, `CourseQuiz`.`created`, `CourseQuiz`.`modified` FROM `1337iot`.`course_quizzes` AS `CourseQuiz` WHERE `CourseQuiz`.`course_section_id` IN (73, 75, 76, 77, 78, 80, 82, 85, 86, 87, 88, 89)

SELECT `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, `InstructionLevel`.`id`, `InstructionLevel`.`title`, `InstructionLevel`.`created`, `InstructionLevel`.`modified` FROM `1337iot`.`courses` AS `Course` LEFT JOIN `1337iot`.`instruction_levels` AS `InstructionLevel` ON (`Course`.`instruction_level_id` = `InstructionLevel`.`id`) WHERE `Course`.`id` = 52 AND `Course`.`status` = '1' LIMIT 1

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SELECT `CourseGoal`.`id`, `CourseGoal`.`course_id`, `CourseGoal`.`title`, `CourseGoal`.`created`, `CourseGoal`.`modified` FROM `1337iot`.`course_goals` AS `CourseGoal` WHERE `CourseGoal`.`course_id` = (52)

SELECT `CourseRequirement`.`id`, `CourseRequirement`.`course_id`, `CourseRequirement`.`title`, `CourseRequirement`.`created`, `CourseRequirement`.`modified` FROM `1337iot`.`course_requirements` AS `CourseRequirement` WHERE `CourseRequirement`.`course_id` = (52)

SELECT `Userdetail`.*, `User`.`id` FROM `1337iot`.`users` AS `User` LEFT JOIN `1337iot`.`userdetails` AS `Userdetail` ON (`Userdetail`.`user_id` = `User`.`id`) WHERE `User`.`id` = 18 LIMIT 1

SELECT `Course`.`id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`coverimage`, `Course`.`summary`, `Course`.`price`, `Course`.`user_id`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name` FROM `1337iot`.`courses` AS `Course` WHERE `Course`.`user_id` = 18 AND `Course`.`publishstatus` = 'Publish' ORDER BY (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) desc LIMIT 2

SELECT COUNT(*) AS `count` FROM `1337iot`.`courses` AS `Course` LEFT JOIN `1337iot`.`users` AS `User` ON (`Course`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`languages` AS `Language` ON (`Course`.`language_id` = `Language`.`id`) LEFT JOIN `1337iot`.`instruction_levels` AS `InstructionLevel` ON (`Course`.`instruction_level_id` = `InstructionLevel`.`id`) WHERE `Course`.`user_id` = 18 AND `Course`.`publishstatus` = 'Publish'

SELECT `Userdetail`.`user_id`, `Userdetail`.`first_name`, `Userdetail`.`last_name`, `Userdetail`.`image` FROM `1337iot`.`user_learning_courses` AS `UserLearningCourse` Inner JOIN `1337iot`.`bundles` AS `Bundle` ON (`Bundle`.`status` = 1 AND `UserLearningCourse`.`bundle_id` = `Bundle`.`id`) LEFT JOIN `1337iot`.`userdetails` AS `Userdetail` ON (`UserLearningCourse`.`user_id` = `Userdetail`.`id`) WHERE `UserLearningCourse`.`course_id` = 52 LIMIT 14

SELECT COUNT(*) AS `count` FROM `1337iot`.`user_learning_courses` AS `UserLearningCourse` LEFT JOIN `1337iot`.`users` AS `User` ON (`UserLearningCourse`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`UserLearningCourse`.`course_id` = `Course`.`id`) Inner JOIN `1337iot`.`bundles` AS `Bundle` ON (`Bundle`.`status` = 1 AND `UserLearningCourse`.`bundle_id` = `Bundle`.`id`) WHERE `UserLearningCourse`.`course_id` = 52

SELECT `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name` FROM `1337iot`.`courses` AS `Course` WHERE `Course`.`id` = 52 AND `Course`.`publishstatus` = 'Publish' LIMIT 1

SELECT `UserLearningCourse`.`id`, `UserLearningCourse`.`user_id`, `UserLearningCourse`.`course_id`, `UserLearningCourse`.`completed`, `UserLearningCourse`.`created`, `UserLearningCourse`.`bundle_id`, `UserLearningCourse`.`modified`, `UserLearningCourse`.`payerid`, `User`.`id`, `User`.`fbid`, `User`.`username`, `User`.`password`, `User`.`remembertoken`, `User`.`loginfrom`, `User`.`status`, `User`.`passwordstatus`, `User`.`newsletter`, `User`.`profiletype`, `User`.`created`, `User`.`modified`, `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name`, `Bundle`.`id`, `Bundle`.`title`, `Bundle`.`is_expired`, `Bundle`.`status`, `Bundle`.`expired_on`, `Bundle`.`created`, `Bundle`.`modified` FROM `1337iot`.`user_learning_courses` AS `UserLearningCourse` LEFT JOIN `1337iot`.`users` AS `User` ON (`UserLearningCourse`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`UserLearningCourse`.`course_id` = `Course`.`id`) Inner JOIN `1337iot`.`bundles` AS `Bundle` ON (`Bundle`.`status` = 1 AND `UserLearningCourse`.`bundle_id` = `Bundle`.`id`) WHERE `UserLearningCourse`.`user_id` IS NULL AND `UserLearningCourse`.`course_id` = 52 LIMIT 1

SELECT `CourseUserQuestion`.`id`, `CourseUserQuestion`.`user_id`, `CourseUserQuestion`.`course_id`, `CourseUserQuestion`.`course_lecture_id`, `CourseUserQuestion`.`heading`, `CourseUserQuestion`.`question`, `CourseUserQuestion`.`created`, `CourseUserQuestion`.`modified`, (select `Userdetail`.`first_name` from userdetails Userdetail where `Userdetail`.`user_id` = `CourseUserQuestion`.`user_id`) AS `CourseUserQuestion__firstname`, (select `Userdetail`.`last_name` from userdetails Userdetail where `Userdetail`.`user_id` = `CourseUserQuestion`.`user_id`) AS `CourseUserQuestion__lastname`, (select lecture_index from course_lectures where `course_lectures`.`id` = `CourseUserQuestion`.`course_lecture_id`) AS `CourseUserQuestion__lectureindex`, `User`.`id`, `User`.`fbid`, `User`.`username`, `User`.`password`, `User`.`remembertoken`, `User`.`loginfrom`, `User`.`status`, `User`.`passwordstatus`, `User`.`newsletter`, `User`.`profiletype`, `User`.`created`, `User`.`modified`, `Course`.`id`, `Course`.`user_id`, `Course`.`category_id`, `Course`.`language_id`, `Course`.`instruction_level_id`, `Course`.`title`, `Course`.`subtitle`, `Course`.`keywords`, `Course`.`summary`, `Course`.`lincence_logo`, `Course`.`lincence_url`, `Course`.`source_title`, `Course`.`source_url`, `Course`.`coverimage`, `Course`.`promovideo`, `Course`.`visibility`, `Course`.`pricetype`, `Course`.`price`, `Course`.`privacy_type`, `Course`.`publishstatus`, `Course`.`status`, `Course`.`created`, `Course`.`modified`, (select count(*) as countstudent from user_learning_courses as UserLearningCourse where `UserLearningCourse`.`course_id` = `Course`.`id`) AS `Course__students`, (select avg(rating) from course_reviews CourseReview where `CourseReview`.`course_id` = `Course`.`id`) AS `Course__avgrating`, (select concat(`Userdetail`.`first_name`,' ',`Userdetail`.`last_name`) as name from userdetails as Userdetail where `Userdetail`.`user_id` = `Course`.`user_id`) AS `Course__name`, `CourseLecture`.`id`, `CourseLecture`.`course_id`, `CourseLecture`.`course_section_id`, `CourseLecture`.`heading`, `CourseLecture`.`course_description`, `CourseLecture`.`content`, `CourseLecture`.`content_type`, `CourseLecture`.`content_title`, `CourseLecture`.`content_external_link`, `CourseLecture`.`content_source`, `CourseLecture`.`supplimentary_material`, `CourseLecture`.`lecture_index`, `CourseLecture`.`prev`, `CourseLecture`.`live_status`, `CourseLecture`.`file1_upload`, `CourseLecture`.`file2_upload`, `CourseLecture`.`created`, `CourseLecture`.`modified` FROM `1337iot`.`course_user_questions` AS `CourseUserQuestion` LEFT JOIN `1337iot`.`users` AS `User` ON (`CourseUserQuestion`.`user_id` = `User`.`id`) LEFT JOIN `1337iot`.`courses` AS `Course` ON (`CourseUserQuestion`.`course_id` = `Course`.`id`) LEFT JOIN `1337iot`.`course_lectures` AS `CourseLecture` ON (`CourseUserQuestion`.`course_lecture_id` = `CourseLecture`.`id`) WHERE `CourseUserQuestion`.`course_id` = 52 AND `CourseUserQuestion`.`user_id` IS NULL ORDER BY `CourseUserQuestion`.`created` desc

Cryptography

by Stanford University

MODULE 1: Introduction (Week 1)

MODULE 2: Stream Ciphers (Week 1)

MODULE 3: Block Ciphers (Week 2)

MODULE 4: Using Block Ciphers (Week 2)

MODULE 5: Message integrity (Week 3)

MODULE 6: Collision Resistance (Week 3)

MODULE 7: Authenticated Encryption (Week 4)

MODULE 8: Odds and Ends (Week 4)

MODULE 9: Basic Key Exchange(Week 5)

MODULE 10: Intro Number theory(Week 5)

MODULE 11: Public key Encryption from trapdoor permutations

MODULE 12: Public key encryption from Diffie-Hellmen (Week 6)

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