Cryptography unit2

1. Unit 2:Symmetric key AlgorithmS

2. Unit 2:Symmetric key AlgorithmS

3. Unit 2:Symmetric key AlgorithmS

4. Unit 2:Symmetric key AlgorithmS

5. Unit 2:Symmetric key AlgorithmS
Block Cipher principles:
1. Number of Rounds –
The number of Rounds is regularly considered in design criteria, it just reflects the
number of rounds to be suitable for an algorithm to make it more complex, in DES
we have 16 rounds ensuring it to be more secure while in AES we have 10 rounds
which makes it more secure.
2. Design of function F –The core part of the Feistel Block cipher structure is the
Round Function. The complexity of cryptanalysis can be derived from the Round
function i.e. the increasing level of complexity for the round function would be greatly
contributing to an increase in complexity. To increase the complexity of the round
function, the avalanche effect is also included in the round function, as the change of
a single bit in plain text would produce a mischievous output due to the presence of
avalanche effect.

6. Unit 2:Symmetric key AlgorithmS
Block Cipher :
PT
CT
64 64 64 64 64 64 64 64 64 64
64 64 64 64 64 64 64 64 64 64
KEY
40,56,64,128,256 bits

7. Unit 2:Symmetric key AlgorithmS

8. Unit 2:Symmetric key AlgorithmS

9. Unit 2:Symmetric key AlgorithmS
(DES)

10. Unit 2:Symmetric key AlgorithmS
(DES)

11. Unit 2:Symmetric key AlgorithmS
(DES)

12. Unit 2:Symmetric key AlgorithmS
(DES)

13. Unit 2:Symmetric key AlgorithmS
(DES)

14. Unit 2:Symmetric key AlgorithmS
(DES)

15. Unit 2:Symmetric key AlgorithmS
(DES)

16. Unit 2:Symmetric key AlgorithmS
(DES) Expansion Permutation

17. Unit 2:Symmetric key AlgorithmS
(DES)

18. Unit 2:Symmetric key AlgorithmS
(DES)

19. Unit 2:Symmetric key AlgorithmS
(DES)

20. Unit 2:Symmetric key AlgorithmS
(DES)

21. Unit 2:Symmetric key AlgorithmS
(DES)

22. Unit 2:Symmetric key AlgorithmS
(DES)

23. Unit 2:Symmetric key AlgorithmS
(DES)

24. Unit 2:Symmetric key AlgorithmS
(AES)

25. Unit 2:Symmetric key AlgorithmS
(AES)

26. Unit 2:Symmetric key AlgorithmS
(AES)

27. Unit 2:Symmetric key AlgorithmS
(AES)

28. Unit 2:Symmetric key AlgorithmS
(AES)

29. Unit 2:Symmetric key AlgorithmS
(AES)

30. Unit 2:Symmetric key AlgorithmS
(AES)

31. Unit 2:Symmetric key AlgorithmS
(AES)

32. Unit 2:Symmetric key AlgorithmS
(AES)

33. Unit 2:Symmetric key AlgorithmS
(AES)

34. Unit 2:Symmetric key AlgorithmS
(AES Key expansion)

35. Unit 2:Symmetric key AlgorithmS
(AES Key expansion)

36. Unit 2:Symmetric key AlgorithmS
(AES Key expansion)

37. Unit 2:Symmetric key AlgorithmS
(AES Key expansion)

38. Unit 2:Symmetric key AlgorithmS
(AES Key expansion)

39. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

40. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

41. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

42. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

43. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

44. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

45. Unit 2:Symmetric key AlgorithmS
(Block cipher operation)

46. Principles of Public key cryptography

47. Principles of Public key cryptography

48. Principles of Public key cryptography

49. Principles of Public key cryptography

50. Principles of Public key cryptography

51. Principles of Public key cryptography

52. RSA Algorithm