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Update README.md
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gotoyuzo committed Jul 2, 2015
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Expand Up @@ -47,11 +47,11 @@ You can use the last and post option parameters to verify several generations, i

TOTP and HOTP algorithm details can be referred at the following URLs.

* [HOTP: An HMAC-Based One-Time Password Algorithm](http://tools.ietf.org/html/rfc4226)
* [TOTP: Time-Based One-Time Password Algorithm](http://tools.ietf.org/html/rfc6238)
* [RFC4226 - HOTP: An HMAC-Based One-Time Password Algorithm](http://tools.ietf.org/html/rfc4226)
* [RFC6238 - TOTP: Time-Based One-Time Password Algorithm](http://tools.ietf.org/html/rfc6238)

In the OTP URI format, the value of "secret" is encoded with BASE32 algorithm.
The Format details are described in the document of Google Authenticator.

* [The Base16, Base32, and Base64 Data Encodings](http://tools.ietf.org/html/rfc4648)
* [RFC4648 - The Base16, Base32, and Base64 Data Encodings](http://tools.ietf.org/html/rfc4648)
* [Google Authenticator Key URI format](https://github.com/google/google-authenticator/wiki/Key-Uri-Format)

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