OWASPASVS 5.0 requirement

ASVS-V4.1.5 Per-message digital signatures are used to provide additional assurance on top of transport protections for requests or transactions which…

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Standard: OWASP ASVS 5.0
Chapter: V4 API and Web Service
Section: V4.1 Generic Web Service Security
Level: L3 (requirement applies from this verification level up)

Requirement

Verify that per-message digital signatures are used to provide additional assurance on top of transport protections for requests or transactions which are highly sensitive or which traverse a number of systems.