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Recent twts in reply to #dlz4iuq

TOTP for 2FA is incredibly easy to implement. So what’s your excuse?
Time-based one-time passwords are one of the more secure approaches to 2FA
— certainly much better than SMS. And it’s much easier to implement than
SMS as well. The algorithm is as follows:

  1. Divide the current Unix timestamp by 30
  2. Encode it as a 64-bit big endian integer
  3. Write the encoded bytes to a SHA-1 HMAC initialized with the TOTP shared key
  4. Let offs = hmac[-1] & 0xF
  5. … ⌘ Read more

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