Flaws are introduced at eve y stage of the protocol development cycle. The engineer is faced with the problem of how t o avoid them. The first step is to gain an understanding of the diflerent flavours of cryptographic protocol flaws, ie. get to know the enemy. This paper provides a classification of protocol flaws, including two new paws in an application of the mental poker protocol, and discusses appropriate countermeasures f o r relevant paw-categories.

Beller, Chang and Yacobi [2] have recently proposed a set of secret key and public key protocols to meet authentication and privacy requirements for conversation set-up protocols for the initiating party of portable communication systems. This paper improves upon the protocols to obtain a higher assurance of authentication and key distribution. Conversation set-up protocols for the responding party are discussed, a public key protocol providing end-to-end authentication and privacy is described, and relative as well as collective merits of the protocols are emphasised.

No abstract

No abstract

No abstract