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Cryptography, part 2 (Spring 2014, Intellectual...

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Avatar for Vitaly Pavlenko Vitaly Pavlenko
March 26, 2014
Programming
140
1

Cryptography, part 2 (Spring 2014, Intellectual High School)

https://github.com/vpavlenko/cryptography-new-task

Avatar for Vitaly Pavlenko

Vitaly Pavlenko

March 26, 2014

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Transcript

  1. Криптография - 2 Виталий Павленко, «Интеллектуал»

  2. Симметричное шифрование

  3. None
  4. None
  5. None
  6. None

  7. • Типичный блочный шифр: принимает 256-битный вход X, 256-битный ключ

    K и возвращает 256- битный выход Y • Как использовать его для шифрования файла размером 1 Мб?
  8. None
  9. None
  10. None

  11. Хэши

  12. None
  13. None
  14. None
  15. None

  16. • Как сделать цифровую подпись?

  17. None

  18. Length-extension attack

  19. None

  20. • MD5 не надёжен: люди научились находить коллизию • fastcoll

    умеет генерировать два разных файла с одинаковым хэшем (содержимое вам не подвластно) • Как сделать две таких программы: одно делает print(‘Protected’), другое print(‘Cracked’), а хэши программ одинаковые?

  21. HTTPS

  22. None
  23. None
  24. None
  25. None
  26. None
  27. None
  28. None

  29. Анекдоты Из книги Д. Склярова «Искусство защиты и взлома информации»

  30. None
  31. None
  32. None

  33. • Ломается ли хитрый шифр, если неизвестен ключ?