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

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

Published
2017-02-03
How to Cite
Bhaumik, R., & Nandi, M. (2017). OleF: an Inverse-Free Online Cipher. An Online SPRP with an Optimal Inverse-Free Construction. IACR Transactions on Symmetric Cryptology, 2016(2), 30-51. https://doi.org/10.13154/tosc.v2016.i2.30-51
Section
Articles