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Title:
Security of Hybrid Key Establishment using Concatenation
Authors: Adam Petcher, Matthew Campagna
Abstract:In a hybrid key establishment system, multiple independent key establishment schemes are combined in a manner that also combines their security properties. Such constructions can combine systems that are secure in different settings and achieve the combined security of all systems. For example, classical and post-quantum systems can be combined in order to secure communication against current threats as well as future quantum adversaries. This paper describes machine-checked proofs of security for a commonly-used hybrid key establishment system that concatenates the secrets produced by other key establishment systems. Practical interpretation of these results is also provided in order to guide the use of this system in applications and standards.
ePrint: https://eprint.iacr.org/2023/972
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