Abstract
In this correspondence, we show that partial information of plaintext can be used to simplify the decryption problem in the case of the GGH cryptosystem. Combined with Nguyen’s previous attack, we solve the numerical GGH challenge of the highest dimension 400, proposed on the Internet by the authors of the cryptosystem. We also discuss how to avoid this attack.
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This work was partially supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (No. R11-2007-035-01000-0).
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Lee, M.S., Hahn, S.G. Cryptanalysis of the GGH Cryptosystem. Math.Comput.Sci. 3, 201–208 (2010). https://doi.org/10.1007/s11786-009-0018-5
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DOI: https://doi.org/10.1007/s11786-009-0018-5