OleF: an Inverse-Free Online Cipher. An Online SPRP with an Optimal Inverse-Free Construction

Authors

  • Ritam Bhaumik Indian Statistical Institute, Kolkata, India
  • Mridul Nandi Indian Statistical Institute, Kolkata, India

DOI:

https://doi.org/10.13154/tosc.v2016.i2.30-51

Keywords:

OleF, online cipher, blockcipher, inverse-free, diblock

Abstract

Online ciphers, in spite of being insecure against an sprp adversary, can be desirable at places because of their ease of implementation and speed. Here we propose a single-keyed inverse-free construction that achieves online sprp security with an optimal number of blockcipher calls. We also include a partial block construction, without requiring any extra key.

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Published

2017-02-03

Issue

Volume 2016, Issue 2

Section

Articles

License

Copyright (c) 2017 Ritam Bhaumik, Mridul Nandi

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

OleF: an Inverse-Free Online Cipher. An Online SPRP with an Optimal Inverse-Free Construction. (2017). IACR Transactions on Symmetric Cryptology, 2016(2), 30-51. https://doi.org/10.13154/tosc.v2016.i2.30-51