STIR/SHAKEN protocol

The STIR/SHAKEN protocol (Secure Telephone Identity Revisited/Signature-based Handling of Asserted information using toKENs) is an attempt to reduce robocalls with spoofed Caller ID by providing different levels of authentication of whether the caller has the right to the number they're identifying as, making it easier to block calls that are suspicious.

Technical documents

 * RFC 5280
 * RFC 8224
 * RFC 8225
 * RFC 8226
 * RFC 8555
 * ACME Challenges Using an Authority Token (draft)
 * TNAuthList profile of ACME Authority Token (draft)
 * Other resources

Links

 * How Your Phone Company Aims to Stop Robocalls
 * Secure Telephone Identity Governance Authority
 * SHAKEN FAQ