Development and implementation of the conference secret key generation protocol based on IKE

The protocol for generating a shared secret key often acts as the basis for informational interaction of participants in an untrusted environment. With the help of such a key, a secure channel or a secure communication network can be built in further interactions. Currently, the task of developing protocols for generating a shared key for a group of participants is relevant. One way to build such protocols is to generalize the protocol for two participants to the case of several participants. In the paper a protocol for generating a shared secret key for a group of participants (for a conference) is developed. The developed protocol is based on the Internet Key Exchange (IKE) protocol from the IPSec family of protocols for two participants, which ensures the implementation of security properties, such as authentication of the subject and message, generation of new keys, protection against reading back, protection against repetition, and a number of others. The strength of the developed key generation protocol is based on the complexity of the discrete logarithm problem in a cyclic group. The work studies the security properties provided by the constructed protocol, in particular, it studies the resistance to coalition attacks that are relevant for group protocols. Some features of the practical application of the constructed protocol are also noted.