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If a passerby hears you say "cypher mode A Y R cypher mode" to unlock your computer, they might not figure out that your password is CAT, but they will figure o

• wissler 13y ago
  Obviously you'd pick a better phrase than "cipher mode". But you make a good point. I think this approach can still work though. - Rotate the cipher based on the current day/time, or rotate it based on the previous use. - You could prime the next password each time you successfully login. So e.g. every time you login, you offer 3 additional letters in "clear mode", but then have to give them back in cipher mode. I think I'd go with the last one. The worst part about all this is that it requires custom programming.