### DES - Data Encryption Standard

wikipedia: Data Encryption Standard 56 bit key

- August 27, 1974

- (1997) 96 Days - RSA DES Challenge
- (1998-02) 41 Days - RSA DES Challenge II-1
- (07-1998) 56 Hours - RSA DES Challenge II-2 - Cost $250,000 - Winnings $10,000
- (01-1999) 22 Hours 15 Minutes - RSA DES Challenge III
- EFF Deep Crack + distribited.net - 250,000 DES engines

### Triple DES

aka: TDES or 3DES

wikipedia: Triple DES -- Effective key strenght (112 bits) -- uses 3 - 56 bit keys - for a key length 168 bit key

- Published 1998 ANSI X9.52 - CBCM mode - Triple-DES - Multiple encryption
- Published 1999 FIPS PUB 46-3

### AES - Advanced Encryption Standard

wikipedia: Advanced Encryption Standard 128, 192 and 256 bit keys

wikipedia: NIST AES Process

September 12, 1997 Rijndael, developed by a Swedish team, is more computationally efficient than 3DES by a wide margin and supports key lengths of 128, 192 and 256 bits. The cipher was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen, and submitted to the AES selection process under the name "Rijndael", a portmanteau of the names of the inventors. 2003 - National Institute of Standards and Technology (NIST)

all key lengths are secure enough for classified information

128 key length is sufficient to protect up to theSECRETlevel. 192 or 256 key lengths are required forTOP SECRETlevel.

Note: Rijndael is Pronounced “Rhine Dahl”

### RSA Key

wikipedia: RSA

- December 14, 1977
- The algorithm was publicly described in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman at MIT; the letters RSA are the initials of their surnames, listed in the same order as on the paper.
- NIST considers a 1024 bit key effective throught 2010
- NIST recommends a minimum key size of 2048 through 2030