The three types of JIT (And why only one actually kills standing access)

Just-in-Time (JIT) access is a security concept designed to minimize longstanding access to sensitive systems, which can be architected in three main ways: credential check-in/checkout, timed group membership, and JIT permission assignment. While all methods aim to reduce the number of users with unused sensitive permissions, only JIT permission assignment effectively eliminates longstanding access by assigning and revoking specific permissions as needed. Credential check-in/checkout involves manually managing access keys but relies on shared credentials and offers limited security improvements. Timed group membership temporarily escalates privileges by adding users to groups but still involves longstanding roles. JIT permission assignment is the most secure and complex, as it directly attaches and detaches permissions for specific tasks, reducing overpermissioning and identity attack surfaces. Organizations are encouraged to integrate all three methods based on their systems, as each has its advantages and drawbacks, with the ultimate goal being the elimination of standing access.

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