Efficient and secure self-escrowed public-key infrastructures

Brown, Jaimee, Gonzalez Nieto, Juan M., & Boyd, Colin (2007) Efficient and secure self-escrowed public-key infrastructures. In Deng, Robert & Samarati, Pierangela (Eds.) ASIACCS '07 Proceedings of the 2nd ACM symposium on Information, computer and communications security, ACM (The Association for Computing Machinery), pp. 284-294.


A self-escrowed public key infrastructure (SE-PKI) combines the usual functionality of a public-key infrastructure with the ability to recover private keys given some trap-door information. We present an additively homomorphic variant of an existing SE-PKI for ElGamal encryption. We also propose a new efficient SE-PKI based on the ElGamal and Okamoto-Uchiyama cryptosystems that is more efficient than the previous SE-PKI. This is the first SE-PKI that does not suffer from a key doubling problem of previous SE-PKI proposals. Additionally, we present the first self-escrowed encryption schemes secure against chosen-ciphertext attack in the standard model. These schemes are also quite efficient and are based on the Cramer-Shoup cryptosystem, and the Kurosawa-Desmedt hybrid variant in different groups.

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4 citations in Scopus
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ID Code: 49450
Item Type: Conference Paper
Refereed: Yes
ISBN: 1-59593-574-6
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 30 Mar 2012 03:04
Last Modified: 30 Mar 2012 03:04

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