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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)
- 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
-
CC BY