A cryptographic protocol to obtain secure communications in extended Ethernet environment

An implementation of a security protocol in an extended LAN environment is described. The protocol has a hierarchical architecture. At the first level, the session key is disposed of, in the second level there are the master keys, and at the highest level there are the public and private key of the manager and the CryptoNet´s keys. The relations between them, the right time to do the keys´ renewal, and the appropriate form in which to do it are also characteristics that make it possible to obtain security based on two very well known algorithms such as the DES and RSA