Seonglae ChoData 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)
Feistel cipher
In cryptography, a Feistel cipher (also known as Luby–Rackoff block cipher) is a symmetric structure used in the construction of block ciphers, named after the German-born physicist and cryptographer Horst Feistel, who did pioneering research while working for IBM; it is also commonly known as a Feistel network. A large number of block ciphers use the scheme, including the US Data Encryption Standard, the Soviet/Russian GOST and the more recent Blowfish and Twofish ciphers. In a Feistel cipher, encryption and decryption are very similar operations, and both consist of iteratively running a function called a "round function" a fixed number of times.
https://en.wikipedia.org/wiki/Feistel_cipher