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The Trouble with Reused Phone Numbers in CIAM

• bell-cot 4mo ago
  > an account-takeover problem email doesn't have, for a couple of reasons. > For email, the namespace is large. > As far as I know personal email providers don’t reuse identifiers. Email providers vary, their policies can change, and "don't reuse" may only mean "...for a year or few". Or - if the email address is "@MyDomain.com", you have issues with expired domain name being picked up by less-than-saintly new owners.
  • mooreds 4mo ago
    That's a good point. The behavior varies wildly based on the domain provider and the behavior when you let a domain expire is similar to what happens when a phone number is deactivated, but with a possibly bigger blast radius.
• rationalist 4mo ago
  > Deactivation tracking is available in the USA because the FCC publishes a reassigned number database TIL https://www.fcc.gov/reassigned-numbers-database https://www.fcc.gov/reassigned-numbers-database