| General | |
|---|---|
| Designers | Horst Feistel et al. |
| First published | 1971 |
| Successors | DES |
| Cipher detail | |
| Key sizes | 48, 64 or 128 bits |
| Block sizes | 48, 32 or 128 bits |
| Structure | Substitution–permutation network, Feistel network |
| Rounds | 16 |
In cryptography, Lucifer was the name given to several of the earliest civilian block ciphers, developed by Horst Feistel and his colleagues at IBM. Lucifer was a direct precursor to the Data Encryption Standard. One version, alternatively named DTD-1,[1] saw commercial use in the 1970s for electronic banking.