| Summary/Abstract |
Public key cryptosystems are secure only when the authenticity of the public key is assured. Shao proposed
a new scheme to overcome the problems of the existing schemes, which suffers from two major drawbacks. The
first drawback is the availability of users’ passwords in plaintext format in key server which are prone to attacks
by ill-minded users. The second one is depending on the key server blindly for certificate generation, without
further verification by the user. To overcome these severe drawbacks, we proposed an improved key authentication
scheme based on Chinese remainder theorem and discrete logarithms. Our scheme allows the user to generate his/
her certificate without the help of any trusted third party. This scheme is intended for online services, military and
defense applications to exchange keys securely.
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