Conclusion
So far, no attack on MASHA has been published, besides the security analysis by its designers. In this study, based on optimizing the guess and determination process of the designers’ Guess and Determine attack, we propose an improved Guess and Determine attack on MASHA with time complexity of 2224, which improves their attack by a factor of 296. To the best of our knowledge, this is the best attack on MASHA so far.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant Nos. 61602514, 61802437, 61272488, 61202491, 61572516, 61272041, 61772547), National Cryptography Development Fund (Grant No. MMJJ20170125), and National Postdoctoral Program for Innovative Talents (Grant No. BX201700153).
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Ding, L., Gu, D., Wang, L. et al. Improved Guess and Determine attack on the MASHA stream cipher. Sci. China Inf. Sci. 64, 199105 (2021). https://doi.org/10.1007/s11432-018-9878-1
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DOI: https://doi.org/10.1007/s11432-018-9878-1