Understanding STIR/SHAKEN – New Anti-Robocalling Protocol Between AT&T / Comcast

Criminals and unscrupulous robocallers often alter the calling number of their outbound telephone calls in order to deceive the called party. The industry’s response has been to develop a new technology standard called STIR [1] (Secure Telephony Identity Revisited) and SHAKEN [2] (Secure Handling of Asserted information using toKENs) which defines how telephone service providers should implement the STIR technology to ensure calling numbers are not spoofed. STIR/SHAKEN uses digital certificates, based on common public key cryptography techniques, to ensure the calling number of a telephone call is secure.

Source: transnexus.com