Cryptology ePrint Archive: Report 2016/1090

OleF: An Inverse-Free Online Cipher

Ritam Bhaumik and Mridul Nandi

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.

Category / Keywords: secret-key cryptography / OleF, online cipher, blockcipher, inverse-free, diblock

Original Publication (in the same form): IACR-FSE-2017

Date: received 20 Nov 2016, last revised 29 Nov 2016

Contact author: bhaumik ritam at gmail com

Available format(s): PDF | BibTeX Citation

Note: There were some late changes to the Camera-Ready version. This is the preprint of the final submitted version.

Version: 20161129:121752 (All versions of this report)

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