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In the STIR/SHAKEN process, attestation occurs when the originating telephone service provider verifies the call's source and call number to attest the incoming number's authenticity. After completing this check, the incoming call is given one of three types of attestation: Full Attestation.

The receiving carrier uses a decryption key and the attestation rating to validate the caller's number and help identify spoofed calls. Essentially, these levels of attestation are flags set by originating service providers indicating how certain they are that the outgoing call is made by the owner of the number.

Attestation is a kind of testimony or confirmation. It is customary to sign a deed, make a will or sign other written documents in the presence of a witness who also signs the document to attest to its contents and the authenticity of the party's signature.

A. SHAKEN stands for Signature-based Handling of Asserted information using toKENs. It is a specification designed to mitigate unwanted robocalls by reducing the impact of caller ID spoofing. Unwanted calls are the number one source of recent complaints to the FCC.

STIR/SHAKEN digitally validates the handoff of phone calls passing through the complex web of networks, allowing the phone company of the consumer receiving the call to verify that a call is in fact from the number displayed on Caller ID.

Differences Between Verification and Attestation Verification is usually done by the party asking for evidence of information provided. This could be an employer or recruiter during the hiring process. Attestation is typically requested by the party that owns a document, such as a potential employee.

The SafetyNet Attestation API provides a cryptographically-signed attestation, assessing the device's integrity. In order to create the attestation, the API examines the device's software and hardware environment, looking for integrity issues, and comparing it with the reference data for approved Android devices.