If the system supports the libqrencode library, a QRCode will be shown, that can be scanned using the Android Google Authenticator application. A one- time p assword is an au tomatic ally g enerated string of characters - a password. By default, this secret key and all settings will be stored in /.googleauthenticator. focus on authenticatio n algorithms HOTP a nd TOTP a s two a lgorithms for generating o ne-time pa sswords. Look at the relevant manpages for more information.įor secret storage and retrieval, you can use for example secret-tool from the libsecret-tools package (to store in the GNOME keyring), or any other vault tool you like. The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms. The google-authenticator (1) command creates a new secret key in the current users home directory. oathtool supports HOTP mode as well, which I am not describing here generating tokens in that mode is a little more involved, as you need to store the number of times a token has been generated, but is still doable. The above assumes tokens are generated in TOTP mode (as most are). To generate tokens, you can invoke oathtool (from the oathtool package) from the command line, like so: oathtool -totp=ALGO -b SECRET -d N -s MM Words written above in capitals are variables that you will need to extract from your actual code. Scanning will return an URI much like the following: otpauth://totp/PROVIDER:ACCOUNT?secret=SECRET&algorithm=ALGO&digits=N&period=MM The image with the QR code can be scanned using zbarimg (or zbarcam), available in the zbar-tools package. For the password, provide a 10-digit time-based one time password conforming to RFC6238 TOTP. This blog post (link takes you to an external page) takes a more detailed look at the security concerns of SMS 2FA.If you can obtain the image with the QR code containing the secret, you can achieve the functionality of Google Authenticator with a handful of command-line tools. For the userid of HTTP Basic Authentication, use the same email address you put in the JSON string. Other channels Twilio Verify supports include push, voice, and email. Most customers end up implementing multiple forms of 2FA, so their users can choose the channel that works best for them. A Kotlin one-time password library to generate 'Google Authenticator', 'Time-based One-time Password' (TOTP) and 'HMAC-based One-time Password' (HOTP) codes based on RFC 42. TOTP has stronger proof of possession than SMS, which can be legitimately accessed via multiple devices and may be susceptible to SIM swap attacks. Increased security compared to SMS 2FA: the secret key input for TOTP is only shared once and the method does not rely on the telephony network, which helps reduce the attack surface. Faster (link takes you to an external page).The present work bases the moving factor on a time value. From RFC 6238s abstract: The HOTP algorithm specifies an event-based OTP algorithm, where the moving factor is an event counter. Software based, not dependent on carrier fees or telephony access and deliverability One of the advantages is purely on the human side of security. Standardized (link takes you to an external page).While SMS is an ideal solution for 2FA adoption (link takes you to an external page) and ease of use, TOTP has several benefits including:
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