M

MAC Address:

A physical address; a numeric value that uniquely identifies that network device from every other device on the planet.

Malicious Code:

Software (e.g., Trojan horse) that appears to perform a useful or desirable function, but actually gains unauthorized access to system resources or tricks a user into executing other malicious logic.

Malicious software:

Software, for example, a virus, designed to damage or disrupt a system. [45 C.F.R. § 164.304].

Mandatory Implementation Specification:

An implementation specification that the act requires to be used.

Mandatory Safeguard:

See mandatory implementation specification.