![]() ![]() One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH) (which is unrelated to OAuth ). If we try to scan the QR code, apps like Microsoft and Google Authenticator generate the same wrong OTP codes (the same OTP generated with sha1). The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). Reading the TOTP string inside the QRcode generated by privacyIDEA, the content is like: These other apps works with SHA1 but don’t work with SHA-256, don’t generating the correct OTP codes with the sha256 algorithm: privacyidea authenticator (open source).These apps works fine with SHA-1 and SHA-256: So we’ve tried many authentication apps, and tested the scanning of the QR code created with sha1 (default) and with sha256. This is the seed code generators use to make codes that work with Google. As such, almost all the security analysis of HOTP applies to TOTP. HOTP uses a counter, shared by both parties, and 'resynchronized' every time a successful authentication occurs TOTP replaces that counter with knowledge of the current time, which is also a shared value. To do this, you’re going to need to generate a secret code for Google Authenticator (Android iOS). The TOTP specification points, for the security analysis, to HOTP. FreeOTP is the most minimalist open-source authenticator. Also read: 8 of the Best Google Authenticator Alternatives. (TOTP or HOTP), the number of characters in the code, the algorithm, and the refresh interval for the codes. privacyIDEA 3.9-1jammy (ubuntu package)Īs reported in the token creation screen, under the SHA drop-down menu, not all authentication apps support sha256 and sha512… Google Authenticator lacks some useful features, but if you don’t want to get involved with storing tokens in the cloud, it’s a decent option.We’re testing privacyIDEA (community edition) in our environment. ![]()
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