International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

K. Phani Kumar

Publications

Year
Venue
Title
2006
EPRINT
Identity Based Strong Designated Verifier Signature Scheme
K. Phani Kumar G. Shailaja Ashutosh Saxena
Identity based cryptosystem simplifies the key management and revocation problem. Here we propose an Identity Based Strong Designated Verifier Signature (IBSDVS) scheme using bilinear pairings. The Designated Verifier Signature scheme described in [10] is identity based but it suffers from the deligatability as pointed out in [4]. We analyse the security of the scheme and show that the problem of delegatability does not exist in our scheme.
2006
EPRINT
Pairing based Mutual Authentication Scheme Using Smart Cards
G. Shailaja K. Phani Kumar Ashutosh Saxena
Bilinear pairings based mutual authentication scheme using smart card is presented. We propose a novel technique of using two different servers, one for registration and other for authentication. The scheme is resilient to replay, forgery, man-in-the-middle and insider attacks.
2006
EPRINT
Secure and Efficient Threshold Key Issuing Protocol for ID-based Cryptosystems
K. Phani Kumar G. Shailaja Ashutosh Saxena
Key issuing protocols deal with overcoming the two inherent problems: key escrow and secure channel requirement of the identity based cryptosystems. An efficient key issuing protocol enables the identity based cryptosystems to be more acceptable and applicable in the real world. We present a secure and efficient threshold key issuing protocol. In our protocol, neither KGC nor KPA can impersonate the users to obtain the private keys and thus it achieves the trust level III \cite{girault}. The protocol is secure against replay, man-in-the-middle and insider attacks.

Coauthors

Ashutosh Saxena (3)
G. Shailaja (3)