| Class | Description | 
|---|---|
| HOTP | Based on IETF RFC 4226 (http://tools.ietf.org/html/rfc4226)
 Code is derived from OATH HOTP algorithm | 
| HOTPUtil | Utility class for  HOTP | 
| TimeBasedOTP | TOTP: Time-based One-time Password Algorithm
 Based on http://tools.ietf.org/html/draft-mraihi-totp-timebased-06 | 
| TimeBasedOTPUtil | Utility class associated with the  TimeBasedOTPclass | 
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