Libelle (cipher)
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Libelle is a German cipher system, developed by the Federal Office for Information Security. The algorithm is not publicised, in an attempt to make cryptanalysis more difficult. Some experts think this security through obscurity is a bad approach, because public scrutiny of an algorithm would uncover potential weaknesses. In order to keep the algorithm secret, it is only distributed as a microchip named Pluto and not as a piece of software.
It's possible to have a secret cipher algorithm while still reaping the benefits of public cryptography research: make a non-weakening change to a public algorithm, like changing the Nothing up my sleeve numbers, or chaining the public cipher with an unrelated secret cipher.
See also
| Block ciphers [edit] |
| Algorithms: 3-Way | AES | Akelarre | Anubis | Blowfish | C2 | Camellia | CAST-128 | CAST-256 | CMEA | CS-Cipher | DEAL | DES | DES-X | FEAL | FOX | FROG | G-DES | GOST | Hasty Pudding Cipher | ICE | IDEA | Iraqi | KASUMI | KHAZAD | Khufu and Khafre | Libelle | LOKI89/91 | LOKI97 | Lucifer | MacGuffin | Madryga | MAGENTA | MARS | MISTY1 | MMB | NewDES | Noekeon | RC2 | RC5 | RC6 | REDOC | Red Pike | S-1 | SAFER | SEED | Serpent | SHACAL | SHARK | Skipjack | SMS4 | Square | TEA | Triple DES | Twofish | XTEA |
| Design: Feistel network | Key schedule | Product cipher | S-box | SPN Attacks: Brute force | Linear / Differential cryptanalysis | Mod n | Related key | XSL Standardization: AES process | CRYPTREC | NESSIE Misc: Avalanche effect | Block size | IV | Key size | Modes of operation | Piling-up lemma | Weak key |
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