(finance) an asset-backed security whose cash flows are backed by the principal and interest payments of a set of mortgage loans.

(computer security) Relying on a potential attacker's lack of knowledge will maintain security.

(Canada) The Canadian foreign signals intelligence and cryptography agency.

plural of social security number

plural of security market line

Alternative form of security through obscurity

The permanent international peacekeeping organ of the United Nations.

(finance) A line representing the relationship between expected return and systematic risk, thus a graphical representation of the CAPM. It is valid both for portfolios and individual assets.

(US) A nine-digit number issued to citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2). The number is issued to an individual by the Social Security Administration. Its primary purpose is to track individuals for taxation purposes. Abbreviated as SSN. In recent years the SSN has become a de facto national identification number.

(Canada) Communications Security Establishment.