Concept of Purposed Protocol Sample Clauses

Concept of Purposed Protocol. The purposed protocol is developed to prevent single point of failure, to reduce computation and communication cost, to satisfy the security requirement and to prevent security attack. There are two important techniques in protocol including key tree and braid groups. The protocol is designed based on STR protocol for reducing the communication cost to constant round. The braid groups is implemented for reducing the computation cost to avoid modular exponential operation. Moreover, the purposed protocol is researched as contributory key agreement protocol in key establishment, the group members compute the group key by themselves. The security requirement is considered in all membership events including join, leave, merge, partition, and refreshing. There are two protocols in this research including the group key agreement protocol using tree-based braid groups and the extended protocol with authentication. CHAPTER 2 LITERATURE REVIEW‌ There are some definitions and terminology regarding authenticated key agreement protocol. A key agreement protocol is a key establishment technique whereby a shared secret key is derived by two(or more) parties as a function of information contributed, or associated with, each of these, such that no party can predetermine the resulting value. A key agreement protocol is contributory if each party equally contributes to the key and guarantees its freshness. Let A and B be two honest parties i.e. legitimate who execute the steps of a protocol correctly. A key agreement protocol is said to provide implicit key authentication (of B to A) if the party A is assured that no other party aside from a specially identified second party B can possibly learn the value of a particular secret key. A key agreement protocol which provides implicit key authentication to both participating parties is called an authenticated key agreement protocol (A-KA). A protocol provides key confirmation if a party is assured that its peer (or a group thereof) actually has possession or a particular secret key. A contributory key agreement protocol provides key integrity if a party is assured that its particular secret key is a function of only the individual contributions of all protocol parties. In particular, extraneous contribution(s) to the group key cannot be tolerated even if it does not afford the attacker(s) with any additional knowledge. A protocol is said to have perfect forward secrecy if compromise of long-term keys does not compromise past se...
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