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Information Security and Cryptology — ICISC 2001

Volume 2288 of the series Lecture Notes in Computer Science pp 103-113

Date:

Concrete Security Analysis of CTR-OFB and CTR-CFB Modes of Operation

  • Jaechul SungAffiliated withCenter for Information Security Technologies(CIST), Korea University
  • , Sangjin LeeAffiliated withCenter for Information Security Technologies(CIST), Korea University
  • , Jongin LimAffiliated withCenter for Information Security Technologies(CIST), Korea University
  • , Wonil LeeAffiliated withCenter for Information Security Technologies(CIST), Korea University
  • , Okyeon YiAffiliated withInformation Security Technology Division, ETRI

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Abstract

In [1], they gave the notions of security for the symmetric encryption and provided a concrete security analysis of the XOR, CTR, and CBC schemes. Among the three schemes, the CTR scheme achieves the best concrete security in their analysis. In this paper, we propose the new schemes, CTR-OFB and CTR-CFB, which have the security as same as that of the CTR scheme on the point of the concrete security analysis and achieve higher resistance against some practical attacks than the CTR scheme.

Keywords

Modes of Operation Concrete Security Pseudorandom Function Family Symmetric Encryption Schemes