HAVAL is a hash function proposed by Zheng et al.in 1992,including 3-,4-and 5-pass versions.We improve pseudo-preimage and preimage attacks on 3-pass HAVAL at the complexity of 2 172 and 2 209.6,respectively,as compar...HAVAL is a hash function proposed by Zheng et al.in 1992,including 3-,4-and 5-pass versions.We improve pseudo-preimage and preimage attacks on 3-pass HAVAL at the complexity of 2 172 and 2 209.6,respectively,as compared to the previous best known results:2 192 and 2 225 by Sasaki et al.in 2008.We extend the skip interval for partial-patching and apply the initial structure technique to find the better message chunks,and combine the indirect-partial-matching,partial-fixing and multi-neutral-word partial-fixing techniques to improve the attacks based on the meet-in-the-middle method.These are the best pseudo-preimage and preimage attacks on 3-pass HAVAL.展开更多
The cryptographic hash functions Extended MD4 and RIPEMD are double-branch hash functions, which consist of two parallel branches. Extended MD4 was proposed by Rivest in 1990, and RIPEMD was devised in the framework o...The cryptographic hash functions Extended MD4 and RIPEMD are double-branch hash functions, which consist of two parallel branches. Extended MD4 was proposed by Rivest in 1990, and RIPEMD was devised in the framework of the RIPE project （RACE Integrity Primitives Evaluation, 1988-1992）. On the basis of differential analysis and meet-in-the- middle attack principle, this paper proposes a collision attack on the full Extended MD4 and a pseudo-preimage attack on the full RIPEMD respectively. The collision attack on Extended MD4 holds with a complexity of 237, and a collision instance is presented. The pseudo-preimage attack on RIPEMD holds with a complexity of 21254, which optimizes the complexity order for brute-force attack. The results in this study will also be beneficial to the analysis of other double-branch hash functions such as RIPEMD-160.展开更多
基金the National Natural Science Foundation of China (Nos.60573032,60773092 and 61073149)the Research Fund for the Doctoral Program of Higher Education of China (No.20090073110027)the Fund for the Key Laboratory of Information Network Secuity of Ministry of Public Security
文摘HAVAL is a hash function proposed by Zheng et al.in 1992,including 3-,4-and 5-pass versions.We improve pseudo-preimage and preimage attacks on 3-pass HAVAL at the complexity of 2 172 and 2 209.6,respectively,as compared to the previous best known results:2 192 and 2 225 by Sasaki et al.in 2008.We extend the skip interval for partial-patching and apply the initial structure technique to find the better message chunks,and combine the indirect-partial-matching,partial-fixing and multi-neutral-word partial-fixing techniques to improve the attacks based on the meet-in-the-middle method.These are the best pseudo-preimage and preimage attacks on 3-pass HAVAL.
基金This work was supported by the National Natural Science Foundation of China under Grant No. 61103238, the ＂Chen Guang＂ project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation of China under Grant No. 09CG29, and the Fundamental Research Funds for the Central Universities of China.
文摘The cryptographic hash functions Extended MD4 and RIPEMD are double-branch hash functions, which consist of two parallel branches. Extended MD4 was proposed by Rivest in 1990, and RIPEMD was devised in the framework of the RIPE project （RACE Integrity Primitives Evaluation, 1988-1992）. On the basis of differential analysis and meet-in-the- middle attack principle, this paper proposes a collision attack on the full Extended MD4 and a pseudo-preimage attack on the full RIPEMD respectively. The collision attack on Extended MD4 holds with a complexity of 237, and a collision instance is presented. The pseudo-preimage attack on RIPEMD holds with a complexity of 21254, which optimizes the complexity order for brute-force attack. The results in this study will also be beneficial to the analysis of other double-branch hash functions such as RIPEMD-160.
