Fork-resilient continuous group key agreement
J Alwen, M Mularczyk, Y Tselekounis - Annual International Cryptology …, 2023 - Springer
Abstract Continuous Group Key Agreement (CGKA) lets an evolving group of clients agree
on a sequence of group keys. An important application of CGKA is scalable end-to-end …
on a sequence of group keys. An important application of CGKA is scalable end-to-end …
CoCoA: concurrent continuous group key agreement
J Alwen, B Auerbach, MC Noval, K Klein… - … Conference on the …, 2022 - Springer
Messaging platforms like Signal are widely deployed and provide strong security in an
asynchronous setting. It is a challenging problem to construct a protocol with similar security …
asynchronous setting. It is a challenging problem to construct a protocol with similar security …
On the insider security of MLS
J Alwen, D Jost, M Mularczyk - Annual International Cryptology …, 2022 - Springer
Abstract The Messaging Layer Security (MLS) protocol is an open standard for end-to-end
(E2E) secure group messaging being developed by the IETF, poised for deployment to …
(E2E) secure group messaging being developed by the IETF, poised for deployment to …
Server-aided continuous group key agreement
J Alwen, D Hartmann, E Kiltz, M Mularczyk - Proceedings of the 2022 …, 2022 - dl.acm.org
Continuous Group Key Agreement (CGKA)--or Group Ratcheting--lies at the heart of a new
generation of scalable End-to-End secure (E2E) cryptographic multi-party applications. One …
generation of scalable End-to-End secure (E2E) cryptographic multi-party applications. One …
Cryptographic administration for secure group messaging
Many real-world group messaging systems delegate group administration to the application
level, failing to provide formal guarantees related to group membership. Taking a …
level, failing to provide formal guarantees related to group membership. Taking a …
On the Tight Security of the Double Ratchet
The Signal Protocol is a two-party secure messaging protocol used in applications such as
Signal, WhatsApp, Google Messages and Facebook Messenger and is used by billions …
Signal, WhatsApp, Google Messages and Facebook Messenger and is used by billions …
DeCAF: decentralizable continuous group key agreement with fast healing
J Alwen, B Auerbach, MC Noval, K Klein… - Cryptology ePrint …, 2022 - eprint.iacr.org
Continuous group key agreement (CGKA) allows a group of users to maintain a
continuously updated shared key in an asynchronous setting where parties only come …
continuously updated shared key in an asynchronous setting where parties only come …
Leveraging smart contracts for secure and asynchronous group key exchange without trusted third party
Group Key Exchange (GKE) is an important tool to develop secure multi-user applications
such as group text messages, ad-hoc networks, and so on. Most of the currently deployed …
such as group text messages, ad-hoc networks, and so on. Most of the currently deployed …
The Cost of Maintaining Keys in Dynamic Groups with Applications to Multicast Encryption and Group Messaging
In this work we prove lower bounds on the (communication) cost of maintaining a shared key
among a dynamic group of users. Being “dynamic” means one can add and remove users …
among a dynamic group of users. Being “dynamic” means one can add and remove users …
Interval key-encapsulation mechanism
Abstract Forward-Secure Key-Encapsulation Mechanism (FS-KEM; Canetti et al. Eurocrypt
2003) allows Alice to encapsulate a key k to Bob for some time t such that Bob can …
2003) allows Alice to encapsulate a key k to Bob for some time t such that Bob can …