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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘2FA/MFA’ Category

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Mysk 🇨🇦🇩🇪 on Twitter: “Google has just updated its 2FA Authenticator app and added a much-needed feature: the ability to sync secrets across devices. TL;DR: Don’t turn it on. The new update allows users to sign in with their Google Account and sync 2FA secrets across their iOS and Android devices.…”

Posted by jpluimers on 2023/05/10

Do not use the Google 2FA Authenticator to to sync secrets across devices.

The why is explained in the (long) tweet by [Wayback/Archive] Mysk on Twitter: “Google has just updated its 2FA Authenticator app and added a much-needed feature: the ability to sync secrets across devices. TL;DR: Don’t turn it on. The new update allows users to sign in with their Google Account and sync 2FA secrets across their iOS and Android devices.…”

For similar reasons, you might not want to use Authy by Twilio to sync between devices either, though that is less insecure as it enforces you to use a backup-password in order to sync these through the cloud: in the past that backup-password had few security restrictions so it was easy to use a relatively insecure password.

Related (most in Dutch):

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Posted in 2FA/MFA, Authentication, Authy, Google, GoogleAuthenticator, Power User, Security | Tagged: , , , , | Leave a Comment »

2fa.directory: public list of sites with two factor auth support which includes SMS, email, phone calls, hardware, and software.

Posted by jpluimers on 2022/05/09

List of sites with two factor auth support which includes SMS, email, phone calls, hardware, and software.

[Wayback/Archive.is] twofactorauth at 2fa.directory with GitHub sources at [Wayback/Archive.is] 2factorauth/twofactorauth: List of sites with two factor auth support which includes SMS, email, phone calls, hardware, and software..

Via: [Archive.is] Jilles🏳️‍🌈 on Twitter: “Ik gebruik custom e-mail accounts + 1Password/keepass en MFA; Yubikey, Authy, Authenticator. Geef geen eerlijk antwoord op googlebare security questions. En nog steeds ligt alles op straat. Tip: https://t2fa.directory … “

–jeroen

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Posted in 2FA/MFA, Authentication, Authy, Power User, Security | Leave a Comment »

GitHub – andOTP/andOTP: Open source two-factor authentication for Android

Posted by jpluimers on 2021/01/05

[WayBack] GitHub – andOTP/andOTP: Open source two-factor authentication for Android.

A few highlights:

  • andOTP is a two-factor authentication App for Android 4.4+.It implements Time-based One-time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP). Simply scan the QR code and login with the generated 6-digit code.
  • OpenPGP: OpenPGP can be used to easily decrypt the OpenPGP-encrypted backups on your PC.
  • BroadcastReceivers: AndOTP supports a number of broadcasts to perform automated backups, eg. via Tasker. These will get saved to the defined backup directory. These only work when KeyStore is used as the encryption mechanism
    • org.shadowice.flocke.andotp.broadcast.PLAIN_TEXT_BACKUP: Perform a plain text backup. WARNING: This will save your 2FA tokens onto the disk in an unencrypted manner!
    • org.shadowice.flocke.andotp.broadcast.ENCRYPTED_BACKUP: Perform an encrypted backup of your 2FA database using the selected password in settings.
  • All three versions (Google Play, F-Droid and the APKs) are not compatible (not signed by the same key)! You will have to uninstall one to install the other, which will delete all your data. So make sure you have a current backup before switching!

PlayStore: [WayBack] andOTP – Android OTP Authenticator – Apps on Google Play

•  Free and Open-Source
•  Requires minimal permissions:
•  Camera access for QR code scanning
•  Storage access for import and export of the database
•  Encrypted storage with two backends:
•  Android KeyStore (can cause problems, please only use if you absolutely have to)
•  Password / PIN
•  Multiple backup options:
•  Plain-text
•  Password-protected
•  OpenPGP-encrypted
•  Sleek minimalistic Material Design with three different themes:
•  Light
•  Dark
•  Black (for OLED screens)
•  Great Usability
•  Compatible with Google Authenticator

Via: [WayBack] ‘Aanvallen via ss7-protocol om 2fa-sms’jes te onderscheppen nemen toe’ – Computer – Nieuws – Tweakers

Check out @Jaykul’s Tweet: https://twitter.com/Jaykul/status/1091200778121957377

Instead of Google authenticator and Authy

Via https://twitter.com/martinfowler/status/1091097388201230339

Related :

Nope. It’s just a secret encoded in a QR code.

Here’s the docs on the format of the URI in the QR code: https://t.co/AJhT6PFAzx

The QR code delivers a simple, durable, shared secret.

Use U2F if you can. It is much safer, as it cannot be phished or copied.

Depends on your risk model. Device to device transfer would be a good mid-ground, but doesn’t solve the “my phone was stolen/bricked/damaged” scenario.

Which is your bigger risk – duplicating (normally encrypted) secrets or losing your device and access to everything?

 

–jeroen

Posted in Android, Authy, Development, Mobile Development, Security, Software Development | Leave a Comment »

Calls from +18553308653 might be because someone is trying to use your phone number to setup a Microsoft account two factor authentication

Posted by jpluimers on 2019/02/18

Got some calls to my phone numbers in The Netherlands from +18553308653 that I did not ask for. The below searches revealed it is likely someone trying to use those to setup Two Factor Authentication.

It was not my live account, as that was already covered by the Microsoft Authenticator app (you can set up your phone number through account.live.com/names/Manage and authentication through account.microsoft.com/security, see steps at [WayBack] Microsoft – Authy).

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Posted in 2FA/MFA, Authentication, Authy, Power User, Security | Leave a Comment »

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