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If a call is assigned full attestation, it means: The carrier is responsible for originating the call. The carrier has a pre-existing direct relationship with the customer who is making the call and can authenticate and identify this caller. The carrier can verify an association with the number used to make the call.

TPM key attestation is the ability of the entity requesting a certificate to cryptographically prove to a CA that the RSA key in the certificate request is protected by either "a" or "the" TPM that the CA trusts.

Attestation is the act of witnessing the signing of a formal document and then also signing it to verify that it was properly signed by those bound by its contents. Attestation is a legal acknowledgment of the authenticity of a document and a verification that proper processes were followed.

Key Attestation gives you more confidence that the keys you use in your app are stored in a device's hardware-backed keystore. The following sections describe how to verify the properties of hardware-backed keys and how to interpret the attestation certificates' extension data.

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.

Jeremy O'Donoghue: The basic idea of attestation is that it is trustworthy evidence or proof about something. In the case of a cybersecurity system, for example, it means that a relying party like a bank or an IoT cloud provider can be confident about what it is that they are receiving from a device.

Partial Attestation (B) - The originator knows the identity of the caller, but cannot confirm their right to use the Caller ID. Gateway Attestation (C) - The identity of the caller is not known, as the call originated outside of the network, or internationally.

Key attestation provides a way for a device's secure hardware to verify that an asymmetric key is in secure hardware, protected against compromise of the Android OS.

Essentially, the attestation levels are designed to protect the integrity of the telecom networks and provide a way to signal confidence levels to other carriers that the calls can be trusted, and at what level.

Key attestation refers to verifying the integrity and authenticity of cryptographic keys stored within an HSM or other hardware device. It involves generating a cryptographic certificate that attests to the validity of the keys and ensures they have not been tampered with or compromised.