An Inverse-free Single-Keyed Tweakable Enciphering Scheme

@inproceedings{Bhaumik2015AnIS,
  title={An Inverse-free Single-Keyed Tweakable Enciphering Scheme},
  author={Ritam Bhaumik and Mridul Nandi},
  booktitle={IACR Cryptology ePrint Archive},
  year={2015}
}
In CRYPTO 2003, Halevi and Rogaway proposed CMC, a tweakable enciphering scheme TES based on a blockcipher. It requires two blockcipher keys and it is not inverse-free i.e., the decryption algorithm uses the inverse decryption of the underlying blockcipher. We present here a new inverse-free, single-keyed TES. Our construction is a tweakable strong pseudorandom permutation TSPRP, i.e., it is secure against chosen-plaintext-ciphertext adversaries assuming that the underlying blockcipher is a… CONTINUE READING

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