Proxy signatures for delegating signing operation
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
A new approach for delegation using hierarchical delegation tokens
Proceedings of the IFIP TC6/TC11 international conference on Communications and multimedia security II
Cryptography and Network Security: Principles and Practice
Cryptography and Network Security: Principles and Practice
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
Efficient Identification and Signatures for Smart Cards
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
An analysis of proxy signatures: is a secure channel necessary?
CT-RSA'03 Proceedings of the 2003 RSA conference on The cryptographers' track
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In an organization, it is a common practice for a user (the delegator) to delegate some rights, in particular the signing right, to another user (the delegate). From the perspective of digital signature, a secure scheme is required to handle the delegation process so that the authorization as well as the signature of the delegate can be verified efficiently. In general, delegation can occur more than one level, thus forming a delegation chain. Among the existing approaches, delegation certificate [1] is a popular technique for performing delegation and handling chained delegation. However, it is not scalable because the verification of authorization is inefficient. In this paper, we extend Kim et al.'s proxy signature [6], which only handles one level of delegation, to support efficient verification for a delegation chain. We first show that a straight-forward extension of Kim et al.'s scheme does not support strong non-repudiation. Wepropose a possible way to modify the scheme to support the property.