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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. ...


A one time pad (OTP) should by definition not have any patterns. An entropy source can have patterns, but an OTP by definition should consist of pure random bits. In general you can create something that is close to a true random number generator by applying a cryptographic hash function over the output of an entropy source. According to NIST you should ...

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