Blowfish (cipher)

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Encryption speed, key strength and extensive peer review of the algorithm were the key motivating factors behind the decision to utilize Blowfish encryption. In , the SWEET32 attack demonstrated how to leverage birthday attacks to perform plaintext recovery i. The outputs are added modulo 2 32 and XORed to produce the final bit output see image in the upper right corner. It's probably no surprise that each team picked its own entry as the best -- but every other team picked Rijndael as the second best. From a practical standpoint of attacking it, it means that for longer key sizes, an attacker is better off researching attacks than trying to guess the key, because there's a good chance they'll be able to find a practical attack. You want the most "vetted" algorithm possible and right now that is AES.

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Blowfish has a bit block size and a variable key length from 32 bits up to bits. It is a round Feistel cipher and uses large key-dependent S-boxes. In structure it resembles CAST, which uses fixed S-boxes. With bit Blowfish encryption, key sizes range from 32 to bits, with 16 cycles of repetition performed – regardless of your key size – during encryption. Blowfish standardizes on bit block sizes, so higher key sizes are recommended for the encryption to achieve sufficient security. Blowfish has only shown to be weak on implementations that don't make use of the full 16 rounds. And while AES is newer, that fact should make you lean more towards BlowFish (if you were only taking age into consideration).