Registration without a phone number on Signal will use zero-knowledge proofs

Signal’s move toward phone-number-free registration using zero-knowledge proofs signals a broader shift toward privacy-preserving identity and authentication models that reduce reliance on traditional identifiers. For CIOs and technology leaders, this has strategic implications for how organizations design secure onboarding, account recovery, and trust frameworks while balancing anonymity, abuse prevention, and compliance requirements. IT teams should view this as an indicator that zero-knowledge and unlinkable identity patterns are becoming practical, with potential relevance for internal secure communications, customer privacy, and future authentication architectures.