Models For Communication Security
- 2. Introduction • A communication system can be described as a set of nodes connected with links. • Information can be processed and stored inside a node and transmitted from one node to another through the links.
- 3. • In Communication the security protection has to be applied together with an actual communication protocol, for example, Internet Protocol (IP). • Integrity and authenticity are two inseparable features in communication. Integrity is to guarantee that the information received is the same as it is sent. Authenticity is to guarantee that the originator appears to the receiver is its actual originator.
- 4. • The protected communications are the communications with one or all the security properties: confidentiality, integrity, and authenticity.
- 5. Protection • Mutual authentication - Each of the nodes must be insured with whom to communicate, i.e., the entity authentication. • Key establishment - The key establishment must be authenticated so that each node will know with whom the keys are established. For each key, both nodes must agree on its usage.
- 6. • Protected negotiation - The two nodes need to negotiate which mechanisms will be applied to the communications, for example, encryption, authentication, etc. • Failure detection - Once the protected communication starts, each node shall be able to detect failures for the protection. That is, if one of the nodes is fail to apply the agreed protection, then the another node shall detect the failure and response properly.