Asymmetric Encryption
Encryption that uses two keys: if you encrypt with one you may decrypt with the other.
Hash Function
One-way encryption using an algorithm and no key.
Hypervisor
Allows multiple virtual operating system guests to run on one host.
Mantrap
A preventive physical control with two doors. Each door requires a separate form of authentication to open.
Tailgating
Following an authorized person into a building without providing credentials.
TCSEC
Trusted Computer System Evaluation Criteria, also known as the Orange Book.
Symmetric Encryption
Encryption that uses one key to encrypt and decrypt.