It has been discovered that identifying files introduced into a system, particularly those originating from external sources, as being subject to security evaluation and deferring the security evaluation until access or attempted access of the file reduces security vulnerabilities of a system. A file introduced into a processing system is tagged with a security tag if the file is introduced via a supervised introduction point and/or introduced by a supervised program. Upon access or attempted access of the tagged file, security evaluation is initiated on the file.
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