Comment on
The creator of Pixelfed announced an upcoming encrypted messenger for the fediverse that will work across the fediverse
Reply in thread
From my understanding, open source encryption is actually better for privacy than closed source, since then you can have external auditors. Basically, encryption is doing a TON of math involving prime numbers, so even if you know the algorithms used, you still won't be able to figure out what the secret (or password) is without using inordinate amounts of computing power.
For more reading, check out Kerkchoff's Principle