5/9/2023 0 Comments The app signal![]() And let’s say you have built up your social graph of user names in the app over time. Now, let’s suppose Signal allows you to sign up using a user name that you come up with, instead of your phone number. If the messaging app’s server does not have your contacts’ phone numbers, then it cannot work out your social graph. Ideally, messaging apps should not upload any of your contacts’ phone numbers into their servers. ![]() Syncing of user social graph to Signal’s server Once you switch on your mobile phone (to receive the text message), it will communicate with telecommunication radio towers, which can be used to work out your physical location. Furthermore, to activate your Signal message app account, it needs to send you a text message (or call you), which means you need to switch on your mobile phone. Once you supply your email address, your anonymity is as good as your anonymity to the email service provider. Even if an identity check is not required (in the US, I believe), you need to supply contact information like email addresses. Every mobile phone number must be verified with an identity check. In most countries, you cannot obtain a mobile phone number anonymously. Some people are not comfortable with that because phone numbers are not anonymous. To sign up for Signal, you need to provide a phone number. Signal messaging app (and WhatsApp as well) uses phone numbers as the user account ID. Here are some of them: Use of phone numbers The controversies emanate from the implementation of the Signal protocol on the Signal messaging app. In fact, it is the gold standard in which other messaging apps implement: WhatsApp, Skype, Google’s RCS and even Facebook Messenger. ![]() The Signal protocol is the cryptography behind the Signal messaging app. You can think of cryptography as the theory and implementation as the practice. Another way to look at this is the difference between theory and practice. Implementation is the application of cryptography in the form of computer programming code. Is Signal still safe?įirst, you need to understand the line between cryptography and implementation. However, some of their decisions were controversial. ![]() Signal has the reputation of being the most private messaging app.
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