B. Umaprasada Rao

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Blind signatures, introduced by Chaum, allow a user to obtain a signature on a message without revealing any thing about the message to the signer. Blind signatures play an important role in plenty of applications such as e-voting, e-cash system where anonymity is of great concern. Identity based(ID-based) public key cryptography can be a good alternative(More)
Multi signature is a signature scheme in which signers jointly generate a signature on a message. Threshold multisignature combines the traits of threshold signature and multisignature. In threshold multisignature, a group of users jointly generate a valid multisignature on a message and any one can verify the validity of the multisignature. However, in(More)
A directed signature scheme allows a designated verifier to directly verify a signature issued to him, and a third party to check the signature validity with the help of the signer or the designated verifier as well. Directed signatures are applicable where the signed message is sensitive to the signature receiver. Due to its merits, directed signature(More)
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