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I need a alternative encryption alcorithm to AES. It shouldn't be AES, Twofish or Serpent and it must be very strong. I dont care about the performance.

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What properties do you need? ChaCha is enjoying increased popularity, but being a stream cipher it's not suitable for every application. Depending on the application, authenticated encryption may be a better choice than plain encryption. – CodesInChaos Dec 21 '14 at 16:06
Why should it not be AES, Twofish, or Serpent? – cpast Dec 21 '14 at 16:50
up vote 1 down vote accepted

Camellia perhaps? NESSIE (EU) and CRYPTREC (Japan) both endorse it.

Your requirements are brief and mysterious so it's difficult to give further suggestions.

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