Abstract
In asymmetric cryptography, public key of an authenticated user is accessible to remaining authenticated users in a communication network. Consequently, an ill minded user can avail and modify public key of a legal user. Therefore, it results the problem of public key authentication. There is a scope to explore the ways to secure the public key of an authorized user together with achieving necessary security services. Several key authentication schemes were developed to assure the public key of authorized users. This paper presents the existing key authentication schemes from the instigation of public-key cryptography to till now.
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