Twofish Encryption

Twofish is a symmetric key block cipher designed by Bruce Schneier and a team of cryptographers as a successor to Blowfish.

Key Generation

Generate a secure key and initialization vector (IV) for Twofish encryption

Encrypt File

Upload a file and encrypt it with Twofish

Decrypt File

Upload an encrypted file and decrypt it with Twofish

About Twofish Encryption

Twofish is a symmetric key block cipher designed by Bruce Schneier and a team of cryptographers as a successor to Blowfish. It was one of the five finalists in the Advanced Encryption Standard (AES) competition, though it was not selected as the final standard.

  • Twofish has a block size of 128 bits and key sizes up to 256 bits.
  • It is a 16-round Feistel network with a bijective F function.
  • The cipher incorporates key-dependent S-boxes, a relatively complex key schedule, and a highly nonlinear maximum distance separable matrix.
  • Twofish is unpatented and has been placed in the public domain.
Key Features:
  • Security: Twofish has been extensively analyzed and no practical cryptanalytic attacks against it have been found.
  • Performance: It was designed to be efficient on a wide range of platforms and is particularly fast in software implementations.
  • Flexibility: Twofish supports key sizes of 128, 192, and 256 bits, making it adaptable to different security requirements.
  • Key-dependent S-boxes: Unlike many other block ciphers, Twofish uses S-boxes that are derived from the encryption key, adding an extra layer of security.
Comparison with AES:

While AES (Rijndael) was ultimately selected as the standard, Twofish remains a strong alternative:

  • Twofish is generally slightly slower than AES in software but can be faster in certain hardware implementations.
  • Twofish's key setup is more complex than AES, which can be a disadvantage for applications that frequently change keys.
  • Both algorithms are considered secure against known attacks, with no practical vulnerabilities discovered.