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Option to set an alternative passcode ("double bottom") that either opens a limited set of chats, opens a different account, or destroys one of the connected accounts completely when entered.
Could be used by political activists in opressive countries when they are required to unlock their chats.
If such an emergency passcode is set, the app won't be able to use your fingerprints or other biometric data to unlock chats. As a result, the absense of biometric unlock could be used a clear indicator that a person has something significant to hide – and it becomes impossible to prove this is not the case.
This might provide a false sense of security and might actually make the situation worse for an activist's or an innocent bystander.
Related suggestion: Separate passcode lock for specific chats or Archive
The card was edited to reflect the broader scope of the issue at hand.
Here is the original text that has been modified:
Double Bottom for Telegram
Dear Pavel Durov,
We have developed a solution for the Telegram client that allows you to hide accounts and open them only through a unique password code (see attached video). There are no traces of the presence of hidden accounts. It is impossible to find out if there are hidden accounts in the messenger and how many are there. The solution is called "Double Bottom". All nuances are thought out to the smallest detail, and the Telegram client itself has not changed in terms of the interface and user experience. Almost no modifications are required from the Telegram team. "Double bottom" is made completely "turnkey", you just need to accept our "Pull Request" in your repository. You can install our build using TestFlight for the review, and if you don't have an iOS device at hand, then watch the video. The source code of the build is available on GitHub.
With best regards, Bekhan Gendargenoevsky / Postuf team.
Full letter (in Russian)
http://postuf.com/postufgram
Website
https://postufgram.com/
Community
https://t.me/postufgram
Source code
https://github.com/Postuf/Telegram-iOS-Double-Bottom-Postufgram
Design
https://www.figma.com/file/3s7Wh6VrNuMvAS5w0ndYdw/
Archive" has no relation to the idea of "Double bottom". These are
completely different ideas.
You have completely changed our message and misled people.
"Double bottom" allows you to use your biometric data, and in this case, your "theory" is complete nonsense.
I ask you to return the previous version of the letter and not to embarrass yourself in front of people.
So, biometric unlock never has to be disabled: to access full chat list one MUST enter a secret PIN code. If one uses fingerprint-unlock, only first bottom will open and "hidden" chats will remain hidden.