Personally Identifiable Information (PII)
OMB has defined the term Personally Identifiable Information (PII) as "any information about an individual maintained by an agency, including, but not limited to, education, financial transactions, medical history, and criminal or employment history and information which can be used to distinguish or trace an individual's identity, such as their name, social security number, date and place of birth, mother's maiden name, biometric records, etc., including any other personal information which is linked or linkable to an individual."

Controlled Unclassified Information
A categorical designation that refers to unclassified information that does not meet the standards for National Security Classification under Executive Order 12958, as amended, but is (i) pertinent to the national interests of the United States or to the important interests of entities outside the federal government, and (ii) under law or policy requires protection from unauthorized disclosure, special handling safeguards, or prescribed limits on exchange or dissemination. Henceforth, the designation CUI replaces Sensitive But Unclassified (SBU).

Encrypt
To alter a file using a secret code so as to be unintelligible to unauthorized parties.

Security Breach
OMB has defined a security breach as follows: "The term breach is used to include the loss of control, compromise, unauthorized disclosure, unauthorized acquisition, unauthorized access, or any similar term referring to situations where persons other than authorized users and for an authorized purpose have access or potential access to personally identifiable information in usable form, whether physical or electronic."