Updating and distributing secret keys in a distributed network

A method of updating and distributing secret keys in a distributed network, wherein the network comprises a plurality of nodes connected to a shared medium of the distributed network, wherein each node of the plurality of nodes is member of at least one group of a plurality of groups, wherein each group is associated with a secret group key, wherein each node of the plurality of nodes stores only the one or more secret group keys, of which it is member,

• said method comprising:
• a first node of the plurality of nodes, generating an authenticated update key request, wherein the authenticated update key request comprises an indication of a membership, of which the first node is member;
• the first node, broadcasting the authenticated update key request on the shared medium of the distributed network;
• each remaining nodes of the plurality of nodes, receiving the authenticated key update;
• each remaining nodes, performing an authentication verification based on the authenticated key update request;
• each remaining nodes, matching the respective memberships with the indication of a membership of the first node comprised in the authenticated key update request;
• each remaining nodes, in case of at least a partial matching of memberships, generating an authenticated update key request response, which comprises an indication of the membership of the respective remaining node;
• each remaining nodes, in case of a partial matching of memberships or a mismatch of the memberships, generating an authenticated update key request and broadcasting the authenticated update key request on the shared medium of the distributed network, wherein the authenticated update key request comprises an indication of a membership, of which the respective remaining node is member.