"Signal is being blocked in Venezuela and Russia. The app is a popular choice for encrypted messaging and people trying to avoid government censorship, and the blocks appear to be part of a crackdown on internal dissent in both countries..."
People who live in countries where DNS and IP blocks are common probably use a different server. I've been running my own for over a year and it works like a dream
It cannot be easily blocked especially if you use your own homeserver every homeserver replicates the channel and it can operate without the original server! That's why signal and telegram are inherently flawed.
To be devils advocate in a sense, this may mean that it doesn't have any backdoors that Russia or Venezuela can use, but the NSA or something still could have one of their own.
Why is THAT not blocked? Certainly they wouldnt roll their own encryption and bypass Signal security protocols after having Moxie come in, right? Right????
I mean it was blocked before Signal was blocked. Russia somewhat famously badly broke their Internet trying to shutdown telegram... and eventually gave up.
I'm guessing Signal finally has enough market share to get the Russian government's attention but not enough market share that they think the web of proxies that kept Telegram online will keep Signal online.
On April 16, 2018, the Russian government began blocking access to Telegram, an instant messaging service. The blocking led to interruptions in the operation of many third-party services, but practically did not affect the availability of Telegram in Russia. It was officially unblocked on June 19, 2020
Some say it was unblocked because they made a deal with Durov. Another opinion is that too many people and services including officials continued to rely on it even during the time it was blocked. Regardless, Telegram did a huge job on circumventing those blocks.
You need a certain market saturation before a ban becomes useful. If very few people are using the service, there's little incentive to invest time/energy in a block.
I suspect the recent wave of riots in the wake of the election is driving the urgency.
All countries should ban US-domiciled companies like signal, or any communication platform hosted in Five-eyes countries, and especially ones domiciled in the US, which has to adhere to National Security Letters.
Signal has strong cryptographic protocols that are not easily broken. It pioneered the use of double ratchet encryption. (Different keys for each message)
It does expose phone numbers to Signal and the US government but that may or may no be a concern depending on what your threat model is.
Matrix isn't as good as Simplex Chat. Briar is good as it is very hard to censor but it does use battery and requires you to be only all the time. (unless you count Briar mailbox)