Abstract
In an ID-Based cryptosystem, identity of users are used to generate their public and private keys. In this system private key is generated by trusted private key generator (PKG). Unlike traditional PKI, this system enables the user to use public keys without exchanging public key certificates. With the exploitation of bilinear pairing, several secure and efficient ID-Based signature schemes have been proposed till now. In this paper, we have proposed an ID-Based signature scheme from bilinear pairing based on Ex-K-Plus problem. The proposed scheme is existentially unforgeable in the random oracle model under the hardness of K-CAA problem. Our scheme is also unforgeable due to hardness of ex-k-plus problem and computationally more efficient than other existing schemes.
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