Authenticated key exchange with entities from different settings and varied groups
ProvSec'12 Proceedings of the 6th international conference on Provable Security
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Key establishment is becoming a widely deployed cryptographic primitive. As such, there has been extensive research on designing algorithms that produce shared secret keys. These protocols require parties to either hold certificates or rely on identity (ID)-based primitives to achieve authentication. Chain and cross certifications allow users trusting different certification authorities to interact. Similarly, there are methods to extend ID-based solutions across multiple key generation centers (KGC). However, there has been no dedicated work on interoperability between the two settings. A straightforward solution would require each user to maintain certificates and ID-based static keys to accommodate all peers. The cost of maintaining many secret keys; matching keys with protocols; and preventing undesired interference would arguably make such a solution impractical. In this work, we offer an alternative where a user needs to keep a single static key pair and can subsequently engage in a session key establishment with peers holding certificates or identity-based keys. Thus, the proposed solution has none of disadvantages of maintaining multiple static private keys.