Algorithm definition in Computer Security terms:
Definition(s): A clearly specified mathematical process for computation; a set of rules that, if followed, will give a prescribed result.
Source(s): NIST SP 800-107 (Superceded by Rev. 1)
NIST SP 800-135 Rev. 1
NIST SP 800-90A Rev. 1
NIST SP 800-56B Rev. 1
reference: CSRC Glossary