System and method for identity verification, forming joint signatures and session key agreement in an RSA public cryptosystem
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United States of America Patent
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Dec 24, 1996
Grant Date -
N/A
app pub date -
Jul 20, 1994
filing date -
Jul 20, 1994
priority date (Note) -
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Abstract
A method for improving an RSA cryptosystem by generating a user private exponent key, having an associated modulus N, and a user public exponent key for each user of the system. Each user's public exponent key is provided to all users of the system. Each user's private exponent key is divided into a two user key portions. A first user key portion is maintained exclusively by the user for whom the associated private exponent key was generated. A second user key portion is entrusted to one or more other users of the RSA system. The bit length of the first user key portion is no greater than fifteen percent of the bit length of the associated modulus N but not less than 56 bits. The two portions of the private exponent key may be used by two users to exchange two numbers, the product of which is used as a session key to secure communications between the two users. The portions of the private exponent key may also be used by different users to verify the identity of each to the other. Additionally, the portions of the private exponent key can be used to form joint signatures on documents.
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