Computer Science / Cryptography

Cryptography and Hashing Overview

بواسطة: Coursera

Overview

Continue learning about blockchain technology by diving into the nature of ownership and how the blockchain is one way to approach decentralized transaction handling. This course also demystifies cryptography and hashing, which are critical for authenticating users and guaranteeing transaction privacy.

This course requires the purchase of two books for the completion of assignments:

Drescher, D. (2017). Blockchain Basics: A Non-Technical Introduction in 25 Steps. (ISBN-13: 978-1484226032)
Antonoupoulos, A. M. (2017). The Internet of Money, Volume Two. (ISBN-13: 978-1947910065)

Syllabus

  • The Nature of Ownership
    • This week we will examine and study the ways that the blockchain keeps track of ownership transactions through the use of electronic ledgers. After an item changes hands many times, one can literally see each handoff by looking at the continuously growing string of data blocks in the blockchain.
  • Organizational Usage of Blockchain Technology
    • In this second week we will explore and discuss the vast array of benefits that a blockchain technology system can bring to different industries and business markets. We will also consider together how Blockchain technology is an ideal system to manage educational achievement and merit.
  • Cryptography and Hashing
    • The key to the blockchain’s success is the use of hash values and encryption. These are the same technologies that allow you to log into your favorite website without revealing your password and the same technologies that allow you to send a private, encrypted text message. By the end of the week you will apply a hashing algorithm to a character string and see the results.
  • Applying Hashes
    • As you will see in this final week, it is sometimes important to step back from a purely functional discussion of what the blockchain can do to what it means when it does it. You will apply cryptography and hashing to a simple scenario in order to determine the authenticity of a simulated email message.

Taught by

Stefano M. Stefan

Computer Science / Cryptography
Cryptography and Hashing Overview
الذهاب الي الدورة

Cryptography and Hashing Overview

بواسطة: Coursera

  • Coursera
  • مجانية
  • الإنجليزية
  • متاح شهادة
  • متاح في أي وقت
  • beginner
  • French, Portuguese, Russian, English, Spanish, Arabic, German, Thai, Indonesian, Kazakh, Hindi, Swedish, Korean, Greek, Italian, Chinese, Ukrainian, Japanese, Polish, Dutch, Turkish
MessagesTimelineExceptionsViews14RouteQueries7Models6GateSessionRequest
8.1.2PHP Version258msRequest Duration2MBMemory UsageGET ar/الدورات/{slug}Route
    • Booting (164ms)
    • Application (93.26ms)
    • 1 x Booting (63.65%)
      164.42ms
      1 x Application (36.1%)
      93.26ms
      14 templates were rendered
      • public.courses.show (resources/views/public/courses/show.blade.php)3bladefile
        Params
        0
        course
        1
        links
        2
        config
      • public.courses.partials.breadcrumbs (resources/views/public/courses/partials/breadcrumbs.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.courses.partials.heading (resources/views/public/courses/partials/heading.blade.php)7bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
        6
        classes
      • public.courses.partials.details (resources/views/public/courses/partials/details.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.courses.partials.breadcrumbs (resources/views/public/courses/partials/breadcrumbs.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.courses.partials.heading (resources/views/public/courses/partials/heading.blade.php)7bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
        6
        classes
      • public.layouts.main (resources/views/public/layouts/main.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.layouts.partials.meta (resources/views/public/layouts/partials/meta.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.layouts.partials.navbar (resources/views/public/layouts/partials/navbar.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.auth.profile.partials.links (resources/views/public/auth/profile/partials/links.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      • public.auth.profile.partials.link (resources/views/public/auth/profile/partials/link.blade.php)8bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
        6
        route
        7
        title
      • public.auth.profile.partials.link (resources/views/public/auth/profile/partials/link.blade.php)8bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
        6
        route
        7
        title
      • public.auth.profile.partials.link (resources/views/public/auth/profile/partials/link.blade.php)8bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
        6
        route
        7
        title
      • public.layouts.partials.flash-session (resources/views/public/layouts/partials/flash-session.blade.php)6bladefile
        Params
        0
        __env
        1
        app
        2
        errors
        3
        course
        4
        links
        5
        config
      uri
      GET ar/الدورات/{slug}
      middleware
      web, localize:ar
      controller
      App\Http\Controllers\CourseController@show
      as
      ar.courses.show
      namespace
      prefix
      /ar
      where
      file
      app/Http/Controllers/CourseController.php:17-35
      7 statements were executed3.35ms
      corspedia
      • select * from `courses` where `slug_ar` = 'cryptography-and-hashing-overview' limit 1
        2.13ms/app/Http/Controllers/CourseController.php:20corspedia
        Metadata
        Bindings
        • 0. cryptography-and-hashing-overview
        Backtrace
        • 17. /app/Http/Controllers/CourseController.php:20
        • 18. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 19. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 20. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 21. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • update `courses` set `visitors` = `visitors` + 1, `courses`.`updated_at` = '2025-04-13 09:48:14' where `id` = 118
        480μs/app/Http/Controllers/CourseController.php:21corspedia
        Metadata
        Bindings
        • 0. 2025-04-13 09:48:14
        • 1. 118
        Backtrace
        • 17. /app/Http/Controllers/CourseController.php:21
        • 18. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 19. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 20. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 21. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select `id`, `name_en`, `name_ar`, `topic_id`, `slug_en`, `slug_ar` from `subjects` where `subjects`.`id` in (8)
        150μs/app/Http/Controllers/CourseController.php:23corspedia
        Metadata
        Backtrace
        • 20. /app/Http/Controllers/CourseController.php:23
        • 21. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 22. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 23. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 24. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select `id`, `name_en`, `name_ar`, `slug_en`, `slug_ar` from `topics` where `topics`.`id` in (1)
        120μs/app/Http/Controllers/CourseController.php:23corspedia
        Metadata
        Backtrace
        • 25. /app/Http/Controllers/CourseController.php:23
        • 26. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 27. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 28. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 29. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `institutions` where `institutions`.`id` in (20) and `institutions`.`deleted_at` is null
        150μs/app/Http/Controllers/CourseController.php:23corspedia
        Metadata
        Backtrace
        • 20. /app/Http/Controllers/CourseController.php:23
        • 21. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 22. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 23. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 24. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `providers` where `providers`.`id` in (2) and `providers`.`deleted_at` is null
        140μs/app/Http/Controllers/CourseController.php:23corspedia
        Metadata
        Backtrace
        • 20. /app/Http/Controllers/CourseController.php:23
        • 21. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 22. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 23. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 24. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `html_files` where `html_files`.`id` = 118 limit 1
        180μs/app/Models/Course.php:84corspedia
        Metadata
        Bindings
        • 0. 118
        Backtrace
        • 21. /app/Models/Course.php:84
        • 28. view::public.courses.show:29
        • 30. /vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:125
        • 31. /vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
        • 32. /vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:72
      App\Models\HtmlFile
      1
      App\Models\Provider
      1
      App\Models\Institution
      1
      App\Models\Topic
      1
      App\Models\Subject
      1
      App\Models\Course
      1
        _token
        QlQew5auEYLhftFO3UhG4IprvfZs20OplK13PJ07
        locale
        ar
        _previous
        array:1 [ "url" => "https://www.corspedia.com/ar/%D8%A7%D9%84%D8%AF%D9%88%D8%B1%D8%A7%D8%AA/crypto...
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /ar/%D8%A7%D9%84%D8%AF%D9%88%D8%B1%D8%A7%D8%AA/cryptography-and-hashing-overview
        status_code
        200
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        request_request
        []
        request_headers
          0 of 0   
        array:24 [▼
  "sec-ch-ua-mobile" => array:1 [▶
    0 => "?0"
  ]
  "sec-ch-ua" => array:1 [▶
    0 => ""HeadlessChrome";v="129", "Not=A?Brand";v="8", "Chromium";v="129""
  ]
  "cache-control" => array:1 [▶
    0 => "no-cache"
  ]
  "pragma" => array:1 [▶
    0 => "no-cache"
  ]
  "upgrade-insecure-requests" => array:1 [▶
    0 => "1"
  ]
  "priority" => array:1 [▶
    0 => "u=0, i"
  ]
  "user-agent" => array:1 [▶
    0 => "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
  ]
  "cf-ipcountry" => array:1 [▶
    0 => "US"
  ]
  "cf-connecting-ip" => array:1 [▶
    0 => "18.189.7.216"
  ]
  "accept" => array:1 [▶
    0 => "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"
  ]
  "sec-fetch-site" => array:1 [▶
    0 => "none"
  ]
  "cf-visitor" => array:1 [▶
    0 => "{"scheme":"https"}"
  ]
  "sec-fetch-mode" => array:1 [▶
    0 => "navigate"
  ]
  "sec-fetch-user" => array:1 [▶
    0 => "?1"
  ]
  "x-forwarded-proto" => array:1 [▶
    0 => "https"
  ]
  "cdn-loop" => array:1 [▶
    0 => "cloudflare; loops=1"
  ]
  "accept-encoding" => array:1 [▶
    0 => "gzip, br"
  ]
  "sec-fetch-dest" => array:1 [▶
    0 => "document"
  ]
  "sec-ch-ua-platform" => array:1 [▶
    0 => ""Windows""
  ]
  "x-forwarded-for" => array:1 [▶
    0 => "18.189.7.216"
  ]
  "cf-ray" => array:1 [▶
    0 => "92fa0be99d2b10f7-ORD"
  ]
  "host" => array:1 [▶
    0 => "www.corspedia.com"
  ]
  "content-length" => array:1 [▶
    0 => ""
  ]
  "content-type" => array:1 [▶
    0 => ""
  ]
]
        request_server
          0 of 0   
        array:50 [▼
  "USER" => "www-data"
  "HOME" => "/var/www"
  "HTTP_SEC_CH_UA_MOBILE" => "?0"
  "HTTP_SEC_CH_UA" => ""HeadlessChrome";v="129", "Not=A?Brand";v="8", "Chromium";v="129""
  "HTTP_CACHE_CONTROL" => "no-cache"
  "HTTP_PRAGMA" => "no-cache"
  "HTTP_UPGRADE_INSECURE_REQUESTS" => "1"
  "HTTP_PRIORITY" => "u=0, i"
  "HTTP_USER_AGENT" => "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
  "HTTP_CF_IPCOUNTRY" => "US"
  "HTTP_CF_CONNECTING_IP" => "18.189.7.216"
  "HTTP_ACCEPT" => "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"
  "HTTP_SEC_FETCH_SITE" => "none"
  "HTTP_CF_VISITOR" => "{"scheme":"https"}"
  "HTTP_SEC_FETCH_MODE" => "navigate"
  "HTTP_SEC_FETCH_USER" => "?1"
  "HTTP_X_FORWARDED_PROTO" => "https"
  "HTTP_CDN_LOOP" => "cloudflare; loops=1"
  "HTTP_ACCEPT_ENCODING" => "gzip, br"
  "HTTP_SEC_FETCH_DEST" => "document"
  "HTTP_SEC_CH_UA_PLATFORM" => ""Windows""
  "HTTP_X_FORWARDED_FOR" => "18.189.7.216"
  "HTTP_CF_RAY" => "92fa0be99d2b10f7-ORD"
  "HTTP_HOST" => "www.corspedia.com"
  "REDIRECT_STATUS" => "200"
  "SERVER_NAME" => "corspedia.com"
  "SERVER_PORT" => "443"
  "SERVER_ADDR" => "141.95.147.152"
  "REMOTE_USER" => ""
  "REMOTE_PORT" => "20208"
  "REMOTE_ADDR" => "172.69.58.221"
  "SERVER_SOFTWARE" => "nginx/1.18.0"
  "GATEWAY_INTERFACE" => "CGI/1.1"
  "HTTPS" => "on"
  "REQUEST_SCHEME" => "https"
  "SERVER_PROTOCOL" => "HTTP/2.0"
  "DOCUMENT_ROOT" => "/var/www/corspedia/public"
  "DOCUMENT_URI" => "/index.php"
  "REQUEST_URI" => "/ar/%D8%A7%D9%84%D8%AF%D9%88%D8%B1%D8%A7%D8%AA/cryptography-and-hashing-overview"
  "SCRIPT_NAME" => "/index.php"
  "CONTENT_LENGTH" => ""
  "CONTENT_TYPE" => ""
  "REQUEST_METHOD" => "GET"
  "QUERY_STRING" => ""
  "SCRIPT_FILENAME" => "/var/www/corspedia/public/index.php"
  "PATH_INFO" => ""
  "FCGI_ROLE" => "RESPONDER"
  "PHP_SELF" => "/index.php"
  "REQUEST_TIME_FLOAT" => 1744537693.9487
  "REQUEST_TIME" => 1744537693
]
        request_cookies
        []
        response_headers
          0 of 0   
        array:5 [▼
  "content-type" => array:1 [▶
    0 => "text/html; charset=UTF-8"
  ]
  "cache-control" => array:1 [▶
    0 => "no-cache, private"
  ]
  "date" => array:1 [▶
    0 => "Sun, 13 Apr 2025 09:48:14 GMT"
  ]
  "set-cookie" => array:2 [▶
    0 => "XSRF-TOKEN=eyJpdiI6IjJjZjE4V3NWT1BzOWRzZVlKS21Qd3c9PSIsInZhbHVlIjoiaGhBYXFxTjlCR0JMRmlOMm5SWlFYVGFpbzJELzNMTGY0aXlaNUhGUlpTWkFwUWdaTHc3ZjBSdWlQTjN4YUlDWnZlVVFMdWpaOWdPOW5UajNOUk9WaGNNclFQRjBXTmZsbUpzWURES0FHTFFlbzBkN3dxNE1Ud1RjT2FWUXo4VEsiLCJtYWMiOiJiNzNjYzYwNzIxYzlhNzllYWUzYTg0M2I3MTYzY2ZiODBkNDE1YzIyNWQzYmIxYzM0YTQyYmVlOTU4NDc2ZDBjIiwidGFnIjoiIn0%3D; expires=Sun, 13 Apr 2025 11:48:14 GMT; Max-Age=7200; path=/; samesite=lax ◀XSRF-TOKEN=eyJpdiI6IjJjZjE4V3NWT1BzOWRzZVlKS21Qd3c9PSIsInZhbHVlIjoiaGhBYXFxTjlCR0JMRmlOMm5SWlFYVGFpbzJELzNMTGY0aXlaNUhGUlpTWkFwUWdaTHc3ZjBSdWlQTjN4YUlDWnZlVVFMd ▶"
    1 => "laravel_session=eyJpdiI6IlRnN0VDeElkRUxuMXJyZlJORllOcnc9PSIsInZhbHVlIjoiR1FaQlFHak5UOGlVMWZ1N0RrWHJvZHVIaFAwV3Q2OXN1VGpGc2NWNHNxVFR3NjJ2K3Y0Tms1dnIwcXZxdUc5VEc3QmRrZjVRZ052ajZlZG9JK0hkNkd1dlZmczhibDVVOEJoQUJtZlNOR282dEQxdnFXcTZzdlVlL3hSWjA2RjgiLCJtYWMiOiI3ZjQyN2U4NWY1OTYxNzIwY2VjY2FjOGY0YWI2NDM0ZTI2M2ZkNzhmYWE2ZDFiYzNiMWY1ZjNlMDk4Y2E5NDYxIiwidGFnIjoiIn0%3D; expires=Sun, 13 Apr 2025 11:48:14 GMT; Max-Age=7200; path=/; httponly; samesite=lax ◀laravel_session=eyJpdiI6IlRnN0VDeElkRUxuMXJyZlJORllOcnc9PSIsInZhbHVlIjoiR1FaQlFHak5UOGlVMWZ1N0RrWHJvZHVIaFAwV3Q2OXN1VGpGc2NWNHNxVFR3NjJ2K3Y0Tms1dnIwcXZxdUc5VEc3 ▶"
  ]
  "Set-Cookie" => array:2 [▶
    0 => "XSRF-TOKEN=eyJpdiI6IjJjZjE4V3NWT1BzOWRzZVlKS21Qd3c9PSIsInZhbHVlIjoiaGhBYXFxTjlCR0JMRmlOMm5SWlFYVGFpbzJELzNMTGY0aXlaNUhGUlpTWkFwUWdaTHc3ZjBSdWlQTjN4YUlDWnZlVVFMdWpaOWdPOW5UajNOUk9WaGNNclFQRjBXTmZsbUpzWURES0FHTFFlbzBkN3dxNE1Ud1RjT2FWUXo4VEsiLCJtYWMiOiJiNzNjYzYwNzIxYzlhNzllYWUzYTg0M2I3MTYzY2ZiODBkNDE1YzIyNWQzYmIxYzM0YTQyYmVlOTU4NDc2ZDBjIiwidGFnIjoiIn0%3D; expires=Sun, 13-Apr-2025 11:48:14 GMT; path=/ ◀XSRF-TOKEN=eyJpdiI6IjJjZjE4V3NWT1BzOWRzZVlKS21Qd3c9PSIsInZhbHVlIjoiaGhBYXFxTjlCR0JMRmlOMm5SWlFYVGFpbzJELzNMTGY0aXlaNUhGUlpTWkFwUWdaTHc3ZjBSdWlQTjN4YUlDWnZlVVFMd ▶"
    1 => "laravel_session=eyJpdiI6IlRnN0VDeElkRUxuMXJyZlJORllOcnc9PSIsInZhbHVlIjoiR1FaQlFHak5UOGlVMWZ1N0RrWHJvZHVIaFAwV3Q2OXN1VGpGc2NWNHNxVFR3NjJ2K3Y0Tms1dnIwcXZxdUc5VEc3QmRrZjVRZ052ajZlZG9JK0hkNkd1dlZmczhibDVVOEJoQUJtZlNOR282dEQxdnFXcTZzdlVlL3hSWjA2RjgiLCJtYWMiOiI3ZjQyN2U4NWY1OTYxNzIwY2VjY2FjOGY0YWI2NDM0ZTI2M2ZkNzhmYWE2ZDFiYzNiMWY1ZjNlMDk4Y2E5NDYxIiwidGFnIjoiIn0%3D; expires=Sun, 13-Apr-2025 11:48:14 GMT; path=/; httponly ◀laravel_session=eyJpdiI6IlRnN0VDeElkRUxuMXJyZlJORllOcnc9PSIsInZhbHVlIjoiR1FaQlFHak5UOGlVMWZ1N0RrWHJvZHVIaFAwV3Q2OXN1VGpGc2NWNHNxVFR3NjJ2K3Y0Tms1dnIwcXZxdUc5VEc3 ▶"
  ]
]
        session_attributes
          0 of 0   
        array:5 [▼
  "_token" => "QlQew5auEYLhftFO3UhG4IprvfZs20OplK13PJ07"
  "locale" => "ar"
  "_previous" => array:1 [▶
    "url" => "https://www.corspedia.com/ar/%D8%A7%D9%84%D8%AF%D9%88%D8%B1%D8%A7%D8%AA/cryptography-and-hashing-overview"
  ]
  "_flash" => array:2 [▶
    "old" => []
    "new" => []
  ]
  "PHPDEBUGBAR_STACK_DATA" => []
]