![]() The method getHOTPToken needs the secret and interval as its arguments. ![]() Here is the simple Golang script to do the job: Taking modulo with 1000000 : 563916 (no padding needed in this case) Generated hash when encoded to string in base32 is: TEQI4DHFALLWYWX3JAXJAAGQGLLEGGOQ Let’s consider current UNIX time is: 1523822557 Since for base32 decoding it requires characters in, our key will be: “DUMMYSECRETDUMMY”. Take modulo with one million and append “0” in front, if needed.Ĭonsider an example: Consider our secret token is “dummySECRETdummy” Choose the offset (last element of hash).(30 is used as we need a new code every 30 seconds) Time used is the current epoch time and take the quotient when we divide it by 30.Decode it in base32 (Allowing characters form and ).The Secret is the 16 digit token - generated by authenticator itself.Pad code with 0 from the left until length of code is 6 Set the first bit of truncatedHash to zero //remove the most significant bit TruncatedHash := hash //4 bytes starting at the offset HTOP is an algorithm which uses hmac algorithm to generate a one-time password.Ī simple pseudo code for generating an OTP is: function GoogleAuthenticatorCode(string secret) TOTP is an algorithm that computes a one-time password from a shared secret key and the current time. Google Authenticator is used for two-step verification based on Time-based One Time Password(TOTP) and HMAC-based One Time Password(HOTP) for authenticating users. You also don’t have to wait to receive the sms from a potentially choppy network or type the number manually. The ForgeRock Authenticator (OATH) module supports HMAC one-time password (HOTP) and time-based one-time password (TOTP) authentication as defined in the OATH standard protocols for HOTP (RFC 4226) and TOTP (RFC 6238). Regardless of the network provider, Google Authenticator solves the sms-based verification problem by removing the dependency on the network provider. The primary advantage of using 2FA over SMS-based verification is, should your mobile sim be stolen, or the sms intercepted via your network provider because of security breaches, you still won’t be able to get the password. ![]() Google Authenticator uses Two-Factor Authentication ( 2FA) to help verify a user’s identity.
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