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2004
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A Hierarchical Key-Insulated Signature Scheme in the CA Trust Model

10 years 1 months ago
A Hierarchical Key-Insulated Signature Scheme in the CA Trust Model
In key-insulated cryptography, there are many private keys with different indexes and a single, fixed public key. When the trust model includes multiple Certification Authorities (CAs), it can be used to shorten the verification path and mitigate the damage caused by the compromise of a CA’s private key. Existing work requires that the total number of CAs be fixed and that a trusted keystore store all private keys. This paper presents a hierarchical key-insulated signature scheme, called HKI, which converts existing key-insulated methods to a hierarchical scheme. Our scheme allows the system to repeatedly generate a new private key for a new CA and also provides two important features, namely a shortened verification path and mitigated damage. By basing our approach on a general key-insulated scheme, we have made it possible to take advantage of any future improvements in computation complexity, key length, or robustness in current key-insulated methods.
Zhengyi Le, Yi Ouyang, James Ford, Fillia Makedon
Added 02 Jul 2010
Updated 02 Jul 2010
Type Conference
Year 2004
Where ISW
Authors Zhengyi Le, Yi Ouyang, James Ford, Fillia Makedon
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