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From RFC 4226: 7.4. Resynchronization of the Counter Although the server's counter value is only incremented after a successful HOTP authentication, the counter on the token is incremented every time a new HOTP is requested by the user. Because of this, the counter values on the server and on the token might be out of synchronization. ...


Usually OTP needs to send the password in clear text to your AAA server. As the otp value is concatenated with a static password, the AAA server, which verifies the credentials, need to split the password. E.g.: Your secret password is "secret" and your OTP generator creates "987432". Then you need to enter "secret987432". As the client component does not ...

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