The ISO 17799 Glossary of Information Security Terms and Phrases

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PAYLOAD (Chapter 8)
This is the 'active' or 'deliverable' part of a virus.

PENETRATION (Chapter 9)
Intrusion or unauthorised entry into a system

PENETRATION TESTING
The act of testing or experimenting by attempting to intrusion via unauthorised entry into a system

PHYSICAL SECURITY (Chapter 7)
The physical protection controls used to safeguard the organisation's systems

PKI: PUBLIC KEY INFRASTRUCTURE (Chapter 10)
Thisis the use and management of public cryptographic keys.

PRIVILEGED USER (Chapter 9)
A User who by virtue of function has been assigned enhanced powers within the computer system.

PROTO-HACKER
A person who has risen above the tinkering level, but does not yet have the necessary skills to crack a major computer system.