Symmetric-key algorithm: Difference between revisions

Revision as of 15:09, 5 December 2022

Revision as of 05:33, 8 December 2022

Line 7:

* Stream ciphers encrypt the digits (typically [[byte]]s), or letters (in substitution ciphers) of a message one at a time. An example is [[ChaCha20]].

**[[Substitution cipher]]s are well-known ciphers, but can be easily decrypted using a [[frequency table]].<ref>{{Cite book|last1=Bellare|first1=Mihir|url=https://web.cs.ucdavis.edu/~rogaway/classes/227/spring05/book/main.pdf|title=Introduction to Modern Cryptography|last2=Rogaway|first2=Phillip|year=2005|language=English}}</ref>

* Block ciphers take a number of bits and encrypt them as a single unit, padding the plaintext soto that it isachieve a multiple of the block size. The [[Advanced Encryption Standard]] (AES) algorithm, approved by [[NIST]] in December 2001, uses 128-bit blocks.

== Implementations ==