Cryptology ePrint Archive: Report 2021/1439

An Addendum to the ZUC-256 Stream Cipher

ZUC Design Team

Abstract: ZUC-256 is a stream cipher, together with AES-256 and SNOW-V, proposed as the core primitive in future set of 3GPP confidentiality and integrity algorithms for the upcoming 5G applications which offer the 256-bit security. \\ While the original initialization scheme of ZUC-256 can work with a 256-bit key and an IV of length up to 184 bits, we describe a new initialization scheme of ZUC-256 that supports an IV of the exact 128 bits in this paper. Compared to the original initialization scheme, this new key/IV setup algorithm avoids the division of the whole key/IV byte and provides a simple and natural-looking initialization scheme for ZUC-256.

Category / Keywords: secret-key cryptography / 5G, Stream ciphers, ZUC, 256-bit security.

Date: received 26 Oct 2021

Contact author: martin_zhangbin at hotmail com

Available format(s): PDF | BibTeX Citation

Note: This paper describes a new initialization scheme of ZUC-256 with 128-bit IV and its security analysis done by the ZUC design team.

Version: 20211027:085054 (All versions of this report)

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