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Article

A new authenticated encryption mode for arbitrary block cipher based on universal hash function

In this article we present a new authenticated encryption mode for arbitrary block cipher. This mode is a combination of well known XEX (XorEncryption-Xor) mechanism used in XTS encryption mode and universal hash function with predetermined properties from special class of functions. The bit length of authentication code being twice as much as the length of a cipher block is an important feature of our mode. The other important feature is the possibility of parallel implementation. The description, some security considerations and aspects of practical implementation are supplied.