The Security of the Extended Codebook (XCB) Mode of Operation

@article{McGrew2007TheSO,
  title={The Security of the Extended Codebook (XCB) Mode of Operation},
  author={David A. McGrew and Scott R. Fluhrer},
  journal={IACR Cryptol. ePrint Arch.},
  year={2007},
  volume={2007},
  pages={298}
}
  • David A. McGrew, Scott R. Fluhrer
  • Published 2007
  • Computer Science
  • IACR Cryptol. ePrint Arch.
  • The XCB mode of operation was outlined in 2004 as a contribution to the IEEE Security in Storage effort, but no security analysis was provided. In this paper, we provide a proof of security for XCB, and show that it is a secure tweakable (super) pseudorandom permutation. Our analysis makes several new contributions: it uses an algebraic property of XCB's internal universal hash function to simplify the proof, and it defines a nonce mode inwhich XCB can be securely used even when the plaintext… CONTINUE READING

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