Chiffrer data with the Twofish block cipher
Twofish est un 128-bit Feistel-network bloc chiffre et AES competition finalist avec clés up en 256 bits. Apprendre le chiffrement flux de travail et quand en choose it sur AES.
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Twofish operates on 128-bit blocks using a Feistel network with key-dependent S-boxes. Though not the AES winner, it remains a secure alternative with comparable strength. The operational steps — key generation, IV handling, padding — are identical to AES, so we demonstrate with AES-256 which shares the same block size and maximum key length.
- 2 Chiffreur AES →
Chiffrer your plaintext with AES-256 (same max key length as Twofish). Paste the plaintext, choose a 256-bit key, and produce ciphertext. The workflow mirrors Twofish exactly.
- 3 Déchiffreur AES →
Déchiffrer the ciphertext back to verify round-trip correctness. If the recovered plaintext matches the original, your key and IV handling are correct.
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When to prefer Twofish: you need a Feistel structure (easier to prove security bounds), are implementing on a platform where Twofish is already available, or have a regulatory requirement for algorithm diversity. In all other cases AES-256 is the default choice.
Questions fréquentes
- Twofish still est-il sécurisé ?
- Yes. Twofish has withstood 20+ years of cryptanalysis with no practical attacks on the full cipher. It is slower than AES on most CPUs but offers comparable security guarantees.
- Why did AES win over Twofish?
- AES (Rijndael) was selected for its combination of security, performance, and simplicity. Twofish was considered secure but its key-dependent S-boxes made implementation more complex and slower on constrained hardware.