How does encryption work?

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U just explained our entire syllabus, hatsoff🙌

vishalsudarshan
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DES (data encryption standard)
- 64 key size, 56 bit for encryption 8 for for error checking
- Divide text in 64 bit chunks, it bit size of text is not divisible by 64 add padding just add
- 16 rounds or number of iterations
- Vulnerable for brute for attack
- Developed in 1970 by IBM
- Use both substitution and permutation operations.

AES (advance encryption standard)
- 3 different key sizes, 128, 196 and 256 bits with 12, 14 and 16 rounds respectively
- Block size of 128 bits
- Works on substitution-permutation network
- Faster and more secure.

Double DES
- Repeating the process of DES 2 times different keys.
- Also not secure

Triple des
- DES is repeated 3 times with 3 different or 2 different keys.

Stream cipher is for data that is of unknown length. block cipher is for data that is of fixed known size and is divided into fixed sized block depending on the encryption algorithm used DES or AES.

naveedalirehmani