4 ms·
According to https://www.authy.com/help/faq https://www.authy.com/help/faq, it looks like they're using http://tools.ietf.org/html/rfc4226 http://tools.ietf.org
by marshray 14y ago
According to https://www.authy.com/help/faq https://www.authy.com/help/faq, it looks like they're using http://tools.ietf.org/html/rfc4226 http://tools.ietf.org/html/rfc4226 HOTP with some version of SHA-2 and a 256 bit seed.
The suggested default for HOTP/TOTP is SHA-1 with a 160 bit seed and that's what most systems seem to use.