System and method for secure messaging in a hybrid peer-to-peer network

A method for changing an encryption key in a hybrid peer-to-peer network comprising:

• receiving, by a first endpoint, an instruction to change from a first encryption key to a second encryption key;
• sending, by the first endpoint, a first message to a second endpoint that the first endpoint is going to change to the second encryption key, wherein the first message is defined for use with a transactional state model and includes information representing the second encryption key;
• receiving, by the first endpoint, in response to the first message, a second message from the second endpoint indicating that the second endpoint received the first message, wherein the second message is defined for use with the transactional state model;
• sending, by the first endpoint, a third message to the second endpoint acknowledging receipt of the second message, wherein the third message is defined for use with the transactional state model;
• and
• changing, by the first endpoint, from the first encryption key to the second encryption key, wherein all incoming messages for the first endpoint are to be encrypted using the second encryption key.