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how OTP token works?

Discussion in 'Electronic Design' started by [email protected], Mar 28, 2013.

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  1. Guest

    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 right password?
    Thanks
     
  2. Jasen Betts

    Jasen Betts Guest

    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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