DES (Digital Encryption Standard) is a symmetric form of encryption adopted that was adopted in 1977 and retired in 2005. It was used by government agencies as a way to protect sensitive data. It has since been retired due to modern computing power being strong enough to brute force the 56bit key length in reasonable time.
| Rounds | Key Length | Sub-key Length | Input Length | S-box Length | Output Length |
|---|---|---|---|---|---|
| 16 | 56-bits | 48-bits | 64-bits | 6-bit input -> 4-bit output | 64 bits |
| Rounds | Key Length | Sub-key Length | Input Length | S-box Length | Output Length |
|---|---|---|---|---|---|
| 5 | 9-bits | 8-bits | 12-bits | 4-bit input -> 3-bit output | 12 bits |