Loopholes in Two Public Key Cryptosystems Using the Modular Group

Authors:
Rainer Steinwandt
Affiliations:
-
Venue:
PKC '01 Proceedings of the 4th International Workshop on Practice and Theory in Public Key Cryptography: Public Key Cryptography
Year:
2001

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Abstract

We demonstrate that the public key cryptosystems using the modular group suggested in [4,5] are vulnerable to very simple ciphertextonly attacks. Consequently, in the present form both of these systems cannot be considered as sufficiently secure for cryptographic purposes.