By Bradley Dunsmore; Stace Cunningham; Syngress Media, Inc. Staff
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Additional resources for Mission Critical! Internetworking Security
The sender attaches this digital signature to the message. The receiver separates the digital signature and decrypts it with the sender’s public key. A hash of the message received is computed. If the two hash values match, then it verifies that this is the authentic message from the sender. This is also called nonrepudiation since the sender cannot deny sending the message. Public Key Certificates Public key certificates are data structures, signed by a trusted certificate authority (CA), that bind an identity to a public key and additional information.
Physical controls include limiting access to network nodes, protecting the network wiring, and securing rooms or buildings that contain restricted assets. Logical controls are the hardware and software means of limiting access and include access control lists (ACLs), communication protocols, and cryptography. Access control depends upon positively verifying an identity (authentication), and then granting privilege based upon identity (authorization). The access could be granted to a person, a machine, a service, or a program.
Confidentiality and integrity are broken if you can’t reliably differentiate an authorized entity from an unauthorized entity. The level of authentication required for a system is determined by the security needs that an organization has placed on it. Public Web servers may allow anonymous or guest access to information. Financial transactions could require strong authentication. An example of a weak form of authentication is using an IP address to determine identity. Changing or spoofing the IP address can defeat this mechanism easily.