arXiv subjects

Kooshiar Azimian

Publications and source records attributed to Kooshiar Azimian.

2 recordsLinked to original sources

arXiv2005

Relations between semantic security and indistinguishability against cpa, non-adaptive cca and adaptive cca in comparison based framework

In this paper we try to unify the frameworks of definitions of semantic security, indistinguishability and non-malleability by defining semantic security in comparison based framework. This facilitates the study of relations among these goals against different attack models and makes the proof of the equivalence of semantic security and indistinguishability easier and more understandable. Besides, our proof of the equivalence of semantic security and indistinguishability does not need any intermediate goals such as non devidability to change the definition framework.

cs.CR↗

arXiv2005

A Verifiable Partial Key Escrow, Based on McCurley Encryption Scheme

In this paper, firstly we propose two new concepts concerning the notion of key escrow encryption schemes: provable partiality and independency. Roughly speaking we say that a scheme has provable partiality if existing polynomial time algorithm for recovering the secret knowing escrowed information implies a polynomial time algorithm that can solve a well-known intractable problem. In addition, we say that a scheme is independent if the secret key and the escrowed information are independent. Finally, we propose a new verifiable partial key escrow, which has both of above criteria. The new scheme use McCurley encryption scheme as underlying scheme.

cs.CR↗