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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. ...


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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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