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Paper 2016/1028

Ratcheted Encryption and Key Exchange: The Security of Messaging

Mihir Bellare and Asha Camper Singh and Joseph Jaeger and Maya Nyayapati and Igors Stepanovs

Abstract

We give a theoretical treatment of ratcheting, lifting it from a technique used in secure messaging protocols to a cryptographic primitive. To allow a modular treatment, we decouple the creation of keys from their use. We define ratcheted key exchange and give a protocol proven to achieve it. We then define ratcheted encryption and show how to achieve it generically from ratcheted key exchange and standard encryption.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Preprint. MINOR revision.
Keywords
Symmetric encryptionforward securitybackward securityauthenticated key exchangeDiffie-Hellman
Contact author(s)
istepano @ eng ucsd edu
History
2019-03-16: last of 3 revisions
2016-11-01: received
See all versions
Short URL
https://ia.cr/2016/1028
License
Creative Commons Attribution
CC BY
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