Difference between revisions of "Attested"
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* The certificate for the signing key from the [[User Device]], and potentially the configuration information from the device, will need to be [[Attested]] by some [[Trusted Third Party]]. | * The certificate for the signing key from the [[User Device]], and potentially the configuration information from the device, will need to be [[Attested]] by some [[Trusted Third Party]]. | ||
| − | * It is recommended that a large number (ca 100,000) devices be equipped with the same public key to avoid privacy concerns.<ref>FIDO TechNotes | + | * It is recommended that a large number (ca 100,000) devices be equipped with the same public key to avoid privacy concerns.<ref name='attestation'>FIDO TechNotes, ''The Truth about Attestation.'' (2018-07-19) https://fidoalliance.org/fido-technotes-the-truth-about-attestation/</ref> Then the public key is basically the [[Identifier]] for the category of [[User Device]]. |
* Attestation can be complex for programmable computers, or simple for one function [[User Device]]s like [[Security Token]]s. | * Attestation can be complex for programmable computers, or simple for one function [[User Device]]s like [[Security Token]]s. | ||
| − | * An example of a single attestation program with associated metadata is described in the | + | * An example of a single attestation program with associated metadata is described in the FIDO web site<ref name='attestation' />. |
* When a simple certificate is used, it typically is accompanied by a metadata statement, an example is [https://developers.yubico.com/U2F/yubico-metadata.json this one at Yubico]. | * When a simple certificate is used, it typically is accompanied by a metadata statement, an example is [https://developers.yubico.com/U2F/yubico-metadata.json this one at Yubico]. | ||
Revision as of 18:41, 31 August 2018
Contents
Full Title or Meme
A statement is Attested if some Trusted Third Party can create a Validated Claim about a User Device used during either Authentication or Authorization.
Context
- The Context in which an Attestation of Security applies is typically during the Validation of the security protection provided to User secrets (such as Credentials) on a User Device.
Problems
- When a secure operation is performed at a user location, the packet returned from that User Device needs to be trusted by the Site that receives it.
- The signing key for that packet from a User Device will have a certificate that binds that signing key to a particular device.
- If the device reports a serial number, or (equivalently) a public key that is unique that that device, that can be used as a tracking number for the owner of the device.
- In 1999 Intel started to ship Pentium Processors with a serial number that created huge public outcry about the privacy implications. They backtracked a lot from their original assertions about security an privacy with a Q&A for their OEMs to address the issues.[1] No company has tried putting a serial number in processors since then.
Solution
- The certificate for the signing key from the User Device, and potentially the configuration information from the device, will need to be Attested by some Trusted Third Party.
- It is recommended that a large number (ca 100,000) devices be equipped with the same public key to avoid privacy concerns.[2] Then the public key is basically the Identifier for the category of User Device.
- Attestation can be complex for programmable computers, or simple for one function User Devices like Security Tokens.
- An example of a single attestation program with associated metadata is described in the FIDO web site[2].
- When a simple certificate is used, it typically is accompanied by a metadata statement, an example is this one at Yubico.
References
- ↑ Andrew Thomas, Intel Processor Serial Number Q&A for OEMs. (2000-05-04) https://www.theregister.co.uk/2000/05/04/intel_processor_serial_number_q/
- ↑ 2.0 2.1 FIDO TechNotes, The Truth about Attestation. (2018-07-19) https://fidoalliance.org/fido-technotes-the-truth-about-attestation/
Other internal and external links
- Synonyms include: Assured Corroborated Validated.
