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how OTP token works?

Hi, i don't understand how OTP token works. Form wikipedia, i read that an OTP password could be basend on:

  • time based approach
  • new password derived from previous one

For example if i consider VASCO digipass, it is based on an hardware token able to create one time passwords: i don't think it is based on time based approach because token and server should be syncronized. If it is based on a new password derived from previous one, if i accidentaly press token key button multiple times, how server can recognize the next password as a righ t password? Thanks

Reply to
lionelgreenstreet
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It knows how to generate passwords too. and hs a faster processor it can trivially check the next 100 passwords to see if you've skipped some

For time based tokens the server can estimate clock skew by which of the passwords you use. (last minute's password, this minute's password, next minute's password)

In both cases the server will accept multiple different passwords and use your choice of password to update its knowledge of the state os your OTP device.

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Reply to
Jasen Betts

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