no details for non-repudiation model

Refer https://d0.awsstatic.com/whitepapers/compliance/AWS_Security_at_Scale_Logging_in_AWS_Whitepaper.pdf

FedRAMP NIST 800-53 Rev 4 AU-10: The information system protects against an individual (or process acting on behalf of an individual) falsely denying having performed [Assignment: organization defined actions to be covered by non-repudiation].

Nonrepudiation – Prevents a user from denying prior commitments or actions.

https://docs.aws.amazon.com/crypto/latest/userguide/awscryp-whatis-toplevel.html