Juan Antonio Lopez-Ramos, Joachim Rosenthal, Davide Schipani et al.
A new proposal for group key exchange is introduced which proves to be both efficient and secure and compares favorably with state of the art protocols.
Mohamed Baouch, Juan Antonio López-Ramos, Reto Schnyder et al.
In this work, we introduce an active attack on a Group Key Exchange protocol by Burmester and Desmedt. The attacker obtains a copy of the shared key, which is created in a collaborative manner with the legal users in a communication group.
Juan Antonio Lopez-Ramos, Joachim Rosenthal, Davide Schipani et al.
In this work we provide a suite of protocols for group key management based on general semigroup actions. Construction of the key is made in a distributed and collaborative way. Examples are provided that may in some cases enhance the security level and communication overheads of previous existing protocols. Security against passive attacks is considered and depends on the hardness of the semigroup action problem in any particular scenario.