Cryptography Part 2: Symmetric Encryption

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Today’s approaches to the cryptographic protection of information include symmetric and asymmetric encryption. In this lesson, I describe cryptographic entropy, how symmetric encryption achieves it, and the reason why it is not practical to crack AES encryption.

Table of Contents:
00:00 - Intro
00:30 - Cryptographic Entropy
02:40 - Stream Ciphers
06:10 - Block Ciphers
08:03 - Substitution Box (S-Box)
08:49 - Permutation Box (P-Box)
09:18 - Electronic Code Book (ECB)
09:50 - Cipher Block Chaining (CBC)
10:29 - Cipher Feedback Mode (CFB)
11:21 - Counter Cipher Mode (CTR)
11:56 - Kerkhoff's Principle
12:35 - When to use Symmetric Encryption
  1. Tom Olzak
  2. cissp
  3. Cryptography
  4. Symmetric encryption
  5. cipher block chaining
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I suppose that symmetric encryption that is effective uses complex entropy, and transmits nonce information when both parties receive the same key? Stream cipher is faster than block cipher, but that would make block cipher much more effective for information/messages that need to be kept highly confidential.

jonothanduran
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Excellent explanation. Thank you sir.

Can you make a special video that goes deeper into ChaCha20 and Salsa20? I don't think there is a video on Youtube that discusses these two algorithms in depth, maybe this will attract other viewers.

FitraRahim