New Cryptographic Primitive: Definition, Model and Construction of Ratched Key Exchange
Dengguo Feng
In the application of traditional cryptography,people always assume that the endpoints are secure and the adversary is on the communication channel.However,the prevalence of malware and system vulnerabilities makes endpoint compromise a se-rious and immediate threat.For example,it is vulnerable to various attacks such as memory content being destroyed by viruses,randomness generator being corrupted,etc.What's worse,protocol sessions usually have a long lifetime,so they need to store session-related secret information for a long time.In this situation,it becomes essential to design high-strength security protocols even in the setting where the memory contents and intermediate values of computation (including the randomness) can be exposed.Ratchet key exchange is a basic tool to solve this problem.In this paper,we overview the definition,model and construction of ratchet key exchange,including unidirectional ratcheted key exchange,sesquidirectional ratcheted key exchange and bidirectionalratcheted key exchange,and prospect the future development of ratchet key exchange.
•Jan 1, 2022•0 citations