Cryptology ePrint Archive: Report 2013/628
Parallelizable Authenticated Encryption from Functions
Abstract: A new authenticated encryption (AE) mode for blockcipher is presented.
The proposed scheme has attractive features for fast and compact operation.
It requires rate-1 blockcipher call, and uses the encryption function of a blockcipher for both encryption and decryption.
Moreover, the scheme enables one-pass, parallel operation under two-block partition.
The proposed scheme thus attains similar characteristics as the seminal OCB mode, without using the inverse blockcipher.
The key idea of our proposal is a novel usage of two-round Feistel permutation, where the round functions are derived from the theory of tweakable blockcipher.
We also describe an instantiation of our idea using a non-invertible primitive, such as a keyed hash function.
Category / Keywords: secret-key cryptography / authenticated encryption, blockcipher, mode of operation
Date: received 30 Sep 2013
Contact author: k-minematsu at ah jp nec com
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Version: 20130930:165459 (All versions of this report)
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