List and briefly define categories of security services.
List of security services are
Brief explanation:
Authentication:
The authentication service is concerned with assuring that a communication is authentic.
Access control:
Access control is the ability to limit and control the access to host systems and applications via communications links.
Data Confidentiality:
Confidentiality is the protection of transmitted data from passive attacks.
Data Integrity:
As with confidentiality, integrity can apply to a stream of messages, a single message, or selected fields within a message.
Nonrepudiation:
Nonrepudiation prevents either sender or receiver from denying a transmitted message. Thus, when a message is sent, the receiver can prove that the alleged sender in fact sent the message. Similarly, when a message is received, the sender can prove that the alleged receiver in fact received the message.