Federal Acquisition Regulation
Requirements for security
FAR 28.201
(a) Agencies shall obtain adequate security for bonds (including coinsurance and reinsurance agreements) required or used with a contract for supplies or services (including construction). Acceptable forms of security include- (1) Corporate or individual sureties; or (2) Any of the types of security authorized in lieu of sureties by Alternatives in lieu of corporate or individual sureties (FAR 28.204) . (b) Solicitations shall not preclude offerors from using the types of surety or other security permitted by this subpart, unless prohibited by law or regulation.