Secure the network traffic Provide encryption for messages. Security Issues Confidentiality Only authorised people should have access to information held on a computer equipment or other devices. The Data Protection Act covers this area.
Different countries have different policies.
Authentication Provides correct identification of the source of a message which is verifiable and reliable. Neither the sender or receiver of information may be able to deny that a transmission took place. useful for vendors of information or financial services and their clients. Access Control Only authorised people may access a communication medium or information stored on an information system. Availability Information and media should be available to authorised people when needed. Many countries in Europe do not even allow the transmission of encrypted data, it may be a criminal offence to be involved in such activities, so check before sending encrypted e-mail and such.