PCI PIN Security CO-8: Keys Are Used Only for Their Designated Purpose

Cryptographic keys must be used only for the specific purpose for which they were generated and distributed. Cross-use of keys between different cryptographic functions must be prohibited.

Maintained by Gerard BlokdykControl text last updated 21 May 2026

Other controls in Key Management

CO-11 Secret and Private Keys and Key Components Are Generated, Conveyed, and Used in a Manner That Prevents or Detects Their Unauthorized Disclosure, Modification, or Substitution
CO-12 Keys Are Used in a Manner That Prevents or Detects Their Unauthorized Usage
CO-13 Keys Are Administered Throughout Their Lifecycle in a Secure Manner
CO-14 Materials Used to Generate or Transport Keys Are Treated With the Same Security as the Keys They Protect
CO-15 Cryptographic Keys Are Replaced With New Keys When Knowledge of Or Access to a Key Is No Longer Required
CO-16 Keys No Longer Used or Replaced Are Securely Destroyed
CO-5 Cryptographic Keys Are Generated Using Approved Methods
CO-6 Cryptographic Keys Are Conveyed or Transmitted Securely

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