Forward-secure proxy signature scheme for cellphone service providers

Everyday Cellphone service providers are growing like mushrooms after rain providing reliable facilities for customers to meet their budget. In view of the growing demand, service providers require the services of various local agents all over the world. The service providers must delegate the power to these agents to execute the services and monitor their performance. If found efficient the agents can continue to operate else they may need to be revoked. We propose to provide this facility using Forward-Secure proxy Signature scheme. A proxy signature scheme allows one user to delegate his/her signing capability to another user called a proxy signer in such a way that the latter can sign messages on behalf of the former. After verification the verifier is convinced of the original signer's agreement on the signed message. Forward-Secure signatures enable the signer to guarantee the security of messages signed in the past even if his secret key is exposed today. We have come up with a forward secure proxy signature scheme which meets the basic requirements of a proxy signature scheme along with proxy revocation.