Data Encryption Standard
Proposed by IBM in 1974 as a standard for encrypting sensitive, unclassified government information. Standardized in 1976/1977 (after tweaks from the submission after consultation with the NSA). 64 bit data block size and 56 bit key size (or 56+8 parity bits).
Feistel Cipher
A framework for building an encryption scheme so you can put any F.
TripleDES
대칭형 암호화를 수행하고, private key를 추가할 수 있다.
비밀번호를 사용하면 복호화가 가능하므로, 내부통신 또는 같은 도메인에서 사용한다.
The Fall of DES
- Key size too small (1998 the EFF built a custom DES-cracker for ~$250,000, broke key in 2 days)