(Replying to PARENT post)

If i remember correctly, Telegram pre-dates Signal by several months. It was well-established by the time Signal became usable. This said, the relationship between Telegram and the cryptography community has always been rocky, probably because they touted their E2E support as a differentiator from the start (Whatsapp, Messenger, and whatever-Google-had were not e2e at the time) but quite a few people pointed out their implementation was weird and broken (it has since changed).
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(Replying to PARENT post)

I think Textsecure[1], the predecessor of Signal, is even older (2010)

And Wikipeida also says that the first version of the Signal Protocol is from 2013[2]

[1] https://en.wikipedia.org/wiki/TextSecure [2] https://en.wikipedia.org/wiki/Signal_Protocol

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(Replying to PARENT post)

They indeed were one of the first if not the first to come out with a messaging app that can e2e encrypt your chat. This was a time when WhatsApp was found using a plaintext protocol, and right after the Snowden revelations. They did move the needle a bit at the right time.

One of the most vocal critics was Moxie, who later founded Signal. It's ironic that 7 years after Snowden and Telegram, Signal the supposed more secure and privacy focused messaging app still has yet to gain any sizable foothold in the market. I think that says a lot about both Telegram and Signal's product strategies.

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