![]() ![]() Obtain a compatible third-party mobile authenticator. Enabling Two-Factor Authentication Through an Authenticator Application These TOTP’s are single-use and regularly refreshed by the authenticator app until required. This can be a particular problem if the attacker breaches a large authentication database.Authenticator applications provide two-factor authentication through the use of a time-based one-time password (TOTP), used in addition to the conventional login and password combination. An attacker with access to this shared secret could generate new, valid TOTP codes at will. TOTP credentials are also based on a shared secret known to both the client and the server, creating multiple locations from which a secret can be stolen. Due to the short window in which TOTP codes are valid, attackers must proxy the credentials in real time. However, users must enter TOTP codes into an authentication page, which creates the potential for phishing attacks. Unlike passwords, TOTP codes are single-use, so a compromised credential is only valid for a limited time. But a single leap second does not cause the integer part of Unix time to decrease, and C T is non-decreasing as well so long as T X is a multiple of one second. When a leap second is inserted into UTC, Unix time repeats one second. ![]()
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