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On the Security of the Improved Knapsack Cryptosystem
Hidenori KUWAKADO Hatsukazu TANAKA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E81-A
No.10
pp.2184-2185 Publication Date: 1998/10/25 Online ISSN:
DOI: Print ISSN: 0916-8508 Type of Manuscript: Special Section LETTER (Special Section on Information Theory and Its Applications) Category: Coded Modulation/Security Keyword: public-key cryptosystem, knapsack problem, choice of encryption keys, continued fraction, LLL algorithm,
Full Text: PDF(153.4KB)>>
Summary:
We discuss the security of the improved knapsack cryptosystem that Kobayashi and Kimura have proposed. Two attacking methods for their cryptosystem are proposed; one is the method for obtaining secret keys from public keys by using the continued fraction, and the other is for decrypting the ciphertext without knowing secret keys. We show that their cryptosystem is not secure against these attacks.
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