HackerSomeone who breaks into computer systems in order to steal, change or destroy information.
HacktivistAn individual who breaches Web sites or secured communications systems to deliver political messages, including those related to foreign policy, or…
Hamming DistanceThe number of non-corresponding digits in a string of binary digits; used to measure dissimilarity.
Hand Geometry RecognitionA biometric modality that uses the physical structure of an individual�s hand for recognition purposes.
HandlerA "subroutine" or "method" that is called by Perl when your program needs to respond to some internal event, such as a "signal", or an encounter with an…
Hash FunctionA function used to create a hash value from binary input. The hash is substantially smaller than the text itself, and is generated by the hash function in…
Hash-based Message Authentication Code (HMAC)A specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret key.
HashingThe process of using a mathematical algorithm against data to produce a numeric value that is representative of that data.
High Assurance Guard (HAG)An enclave boundary protection device that controls access between a local area network that an enterprise system has a requirement to protect, and an…
High Impact SystemAn information system in which at least one security objective (i.e., confidentiality, integrity, or availability) is assigned a FIPS 199 potential impact…
Honey PotIn our context, it is also known as a “spam trap”. We have thousands of domains which accept all email sent to them, with the express purpose of…
HoneypotA host that is designed to collect data on suspicious activity and has no authorized users other than its administrators.
hot siteAn alternate facility that has the equipment and resources to immediately recover the business functions affected by the occurrence of a disaster See also…