![]() You can use one app for all your accounts on different websites as well as for your multiple accounts on one website. The same one-time passwords would be generated on your smartphone without access to the Internet or cellular network and on the authentication server (in client-server paradigm), if the one-time passwords match, you get access to your account. No need for network connection.The use of such OTP generation algorithms allows Google Authenticator to work without the network connection.The lifetime of all OTP passwords generated according to TOTP or HOTP algorithms is 60 seconds, i.e. Though there are still websites using HOTP algorithm where the counter is used to compute the passwords. TOTP is more widespread and reliable – this is an algorithm in which time is used as one of the parameters for one-time passwords generation. Google Authenticator app supports both Time-based One-Time Password (TOTP) and HMAC-based one-time password (HOTP) OTP generation algorithms, which allows using it with more resources. Besides, it should be noted that the software works on almost all versions of Android and takes no more than 2 MB, which is significant for owners of phones with a small amount of RAM. Google Authenticator has decisive, easy to use, clear UI (user interface) that even a child would find informative. It’s free, handy, and offered on many websites by default. Google two-factor authentication app is probably the most popular and best known among 2FA evangelists. Test free 2FA authenticator with cloud backup Protectimus SMART OTP
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