Cryptanalysis of ORYX


Published: Apr 04, 2000 Updated: Apr 04, 2000 Section: Network Security Library :: Cryptography Author: Company: Counterpane Internet Security, Inc. Printable Version Adjust font size: 1 2 3 4 5

We present an attack on the ORYX stream cipher that requires only 25-27 bytes of known plaintext and has time complexity of 216. This attack directly recovers the full 96-bit internal state of ORYX, regardless of the key schedule. As the ORYX cipher is used to encrypt the data transmissions in the North American Cellular system, these results are further evidence that many of the encryption algorithms used in second generation mobile communications offer a low level of security.

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