this post was submitted on 17 Sep 2023
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Privacy
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I don't see an issue as signal is designed not to trust the server. Signal also uses sealed sender and Perfect Forward Secrecy, which is something almost all e2ee messengers lack. What it means in practice is signal leaks very little if any metadata, if you leak metadata you give away details about who your talking to and for how long, etc. Examples might include talking with a suicide hotline, or a doctor, maybe a customer service agent at a company and for how long. Those details will give a lot away about you, even if the messages or calls themselves are encrypted. Matrix is not recommended for communication because it fails to properly hide metadata and actively trusts the servers. When you make a call on signal, as long as both users have "Always Relay Calls" set to disabled, your calls will be peer to peer instead of trusting a central server to facilitate the connection and trusting a middle man. What this means is since the connection is peer to peer you can leak your IP address to the user you're talking to, however a VPN fixes this issue.
Thanks for taking the time to reply. There are multiple issues with centralization.
A prime one is that the entity that you (have no choice but to) trust today will eventually turn against you at some point down the road. In the case of Signal, the writing is on the wall already: using a 3rd party client is against Signal's ToS, and Signal has been seen pushing controversial features like crypto payments that, as a user of their captive ecosystem, you have no choice but to engage with.
Signal is an entity that's incorporated in a jurisdiction and might be compelled by law not to provide service for certain users, or to degrade its encryption to comply with the local regulator. Using a centralized service like Signal makes you an easily identifiable/prime target in such a scenario.
No matter what Signal says, nobody but themselves can verify what code runs on their servers, and what amount of logging/data processing goes there. Because every account checks in through them, because every message is routed through them, there is no technical barrier to knowing who's who, who's talking to whom and when, with the nature of the communication (text, video, image, …) from which a lot can be inferred. As far as I understand the American law, any agency could tap into that, either directly, or via Amazon on which the whole thing is running. I am not paranoid enough to believe that 3 letter agencies belong to one's typical threat model, but with SGX contact discovery from phone number and sealed senders, Signal kindah panders to those? Either way, those are unverifiable mitigations to problems that decentralized systems do not have.
I could go on and on, but the first one is the main one IMO: we are past the need to trust anybody with our instant messaging and put a fundamental aspect of our lives at the mercy of (geo)political and societal woes. That's practically a solved problem in the opensource world, and we can make it ethical and sustainable by just opting out of the dominative model of monopolistic and centralized systems.
As far as it being against signals tos, molly exists and had not received any problems from the signal foundation to my knowledge, discord has the same clause and they don't seem to give a rats ass. Sure they could enforce it but they don't, and personally with how matrix clients are handled they have mixed security, fluffychat has security issues ranging from outdated SDK versions to quite literally ddosing homeservers because of a non-existent rate limit.
The crypto stuff wasn't great but you know what's cool? You don't have to use it. Simple as that. You don't have to engage with it and you and I both know that. It's buried in settings and you have to find it yourself.
Signal is not an anonymity tool, and has never been advertised as such, if you need anonymity, signal is not a good choice. You can make it more anonymous by using a burner phone but that's a different topic.
If everything is encrypted, what could Amazon tap? You do realize sealed sender and PFS take away any trust from the server correct? It's all encrypted, your aren't trusting the server at all, it's completely trust-less, and unless you think Amazon or governments can at this very moment tap any encrypted data and decrypt it, I would recommend taking a walk outside and realize that no one, NO ONE can decrypt current encrypted standards.
Unless you can point me to a reputable article showing in great detail that signal is lying about their e2ee claims then I'll rest my case. Signal has been proven time and time again to not have any data on their users except the minimum required for the service to work, that's called integrity.
Also there will always be someone you trust on the internet, nothing will change that unless we completely rethink how the internet works.
Edit: added quotes Edit 2: added extra info
Federation is different in that:
you can chose amongst a very diverse pool of providers, including local ones that you actually have a chance to meet in person, those with shared ideals that enable long-lasting/mutually-beneficial relationships, some operating truly in the open and enabling a just and provable retribution for the offered service (i.e. "you are not the product"), etc
you can be your own provider, and with "turnkey" self-hosting options like https://snikket.org/ , it's never been easier to do it safely at small/medium scale, and cheaply (e.g. for a family/neighbourhood/association on a shared instance/RPi/…)
choosing a provider never cuts you off from the rest of the network: you are not tied to anyone, and you can migrate with no drama nor loss of contacts/histories/data like is the case when the captive networks "flavour of the year" inevitably shut down.
You must be new on the internet to believe that this is a sustainable state of affairs. Google was letting you use GApps for free until it didn't. Reddit used to be mostly usable and ads/clutter-free until it wasn't. Recently Unity pulled a weird one against their users and customers for a quick buck. Examples are plenty, and more recently people have referred to this as "enshittification" or "the tyranny of the marginal user". Such monopolistic networks are particularly prone to that phenomenon, by design. Personally I don't want to live under the constant threat of a single entity potentially changing its mind/ToS, and I certainly don't want to drag my family, friends and peers into the gamble.
fair but you missed the point: Signal already controls and enforce this aspect of your user experience, which only benefits themselves, in spite of the significant backlash. Sure you can feign blindness, but what's next and what recourse will you have ?
Integrity has nothing to do with that, Signal can absolutely be forced by law to suspend its service in some countries (e.g. to implement sanctions) and whole regions can disappear from the network overnight. In terms of resiliency, that's pretty much how email (federated) just works from anywhere, but things like WhatsApp are blocked in e.g. China or allowed to work without E2EE (e.g. in some Gulf countries).
Sure, but you missed my point, in case of sealed senders and contacts discovery, we are not talking about zero-knowledge/E2EE but about Signal basically saying "trust us, bro, we ain't looking at it" which can't be proven one way or the other.
I'm not sure that you understand what's really going on. All your messages are routed through Signal. You can absolutely infer who's talking to whom with enough frames by just matching packets popping out of X and being received by Y. Encryption plays no role in that because this takes place at a lower level. At least some protocols like XMPP let you host services entirely on Tor or to even skip the central server.
If the messages are E2EE, the server wouldn't have access to this information.
It would, just looking at how much data gets transferred
Unfortunately this is not enough. A malicious Signal server can mount a timing correlation attack and infer the social graph of an user. Having a centralized server makes it more difficult to mitigate such risk.
Relying on a centralized service can still be problematic. If nothing else it's a central point of failure, even if you don't have any particular privacy concerns due to the usage of end-to-end encryption. Signal also relies on Intel SGX for some of their privacy features on the server, which is somewhat dubious. AFAIK this is currently mostly used for contact discovery, which would otherwise be an even worse situation, but it has seemed in the past like they were interested in expanding this, though maybe that's just all speculation. Regardless, my main concern with signal being centralized is that you have a lot less control over your chat. Signal can change on a moments notice and it's all just gone.