How to construct pseudorandom permutations from pseudorandom functions
SIAM Journal on Computing - Special issue on cryptography
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FSE'06 Proceedings of the 13th international conference on Fast Software Encryption
EME*: extending EME to handle arbitrary-length messages with associated data
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An Improved Security Bound for HCTR
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Tweakable Pseudorandom Permutation from Generalized Feistel Structure
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Efficient tweakable enciphering schemes from (block-wise) universal hash functions
IEEE Transactions on Information Theory
On Some Weaknesses in the Disk Encryption Schemes EME and EME2
ICISS '09 Proceedings of the 5th International Conference on Information Systems Security
Double ciphertext mode: a proposal for secure backup
International Journal of Applied Cryptography
Double ciphertext mode: a proposal for secure backup
International Journal of Applied Cryptography
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IMACC'11 Proceedings of the 13th IMA international conference on Cryptography and Coding
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Naor and Reingold had proposed the construction of a strong pseudo-random permutation (SPRP) by using a layer of ECB encryption between two layers of invertible block-wise universal hash functions. At Crypto 2007, Halevi presented constructions of invertible block-wise universal hash functions and a new mode of operation (called TET) based on them. In this paper, we present a new mode of operation called HEH using the Naor-Reingold approach. This is built using a new construction of invertible block-wise universal hash function. The new construction improves over Halevi's construction by removing restrictions on the hashing key. This in turn, leads to HEH improving over TET by allowing more efficient encryption and decryption of variable length messages as well as supporting better key agility. For the important application of disk encryption, we present a variant called HEHfp which has better key agility than TET.