OPIE - One-time Passwords In Everything

Created on 2021-01-29T16:16:39-06:00

Return to the Index

This card can also be read via Gemini.

Seems to be the predecessor to modern Timed One Use Passwords (TOTP.)

Instead of a secret which derives a login code from the current time, there is a rolling secret. Each use decreases a usage vector clock and generates a new password to use for the next login.

It is possible to pre-generate these passwords and store them in a notebook.

https://docs.freebsd.org/en_US.ISO8859-1/books/handbook/one-time-passwords.html