Again, it says this is done without compromising security, and the matching of new users to a phone’s contacts is anonymized. Signal has also been criticized for alerting users when one of their phone’s contacts joins up, intended to drive viral growth. Signal has been criticized for its use of phone numbers as its primary ID, albeit it says it doesn’t collect any data linked to the number. If security is your concern, then Signal is the best step-up from WhatsApp. In reality, you can trust Telegram with your content and there are no serious claims to the contrary, but that’s different from a provider technically unable to access your content, even if they want to. MTProto, the encryption protocol used by Telegram, is proprietary and only partly opensource. Technically, Telegram can access your messages, which are stored on its servers, backed up to its cloud, and to which it holds the key. The lack of default end-to-end encryption “gives users a false sense of privacy,” warns security analyst John Opdenakker. The encryption issue makes it difficult to recommend Telegram from a pure security point of view. Signal and Telegram soaring Apple App Store There is a “secret chat” option, where one user can message another using end-to-end encryption between the two devices and bypassing Telegram’s cloud, but this does not extend to groups. Telegram does not offer end-to-end encryption by default. Ironically, users moving from WhatsApp to Telegram are making a regressive move from a security standpoint. The situation with Telegram is very different.
Signal does not offer any such option, for security reasons. WhatsApp’s main security weakness is its cloud backup option, which stores your chat history, absent end-to-end encryption in Google’s or Apple’s cloud. But both are end-to-end encrypted-your content is safe. Both use Signal’s encryption protocol, but whereas Signal’s is fully opensource, meaning it can be examined for vulnerabilities by security researchers, WhatsApp uses its own proprietary deployment. Signal’s security is better than WhatsApp’s. Yes, there have been examples of WhatsApp’s security being compromised, most famously by alleged Israeli spyware in 2019, but these are endpoint compromises-attacks on phones, not weaknesses in WhatsApp’s own infrastructure. WhatsApp popularized end-to-end encryption, where only the sender and recipients of a message can read its contents, and it deserves great credit for this and for defending the use of such security despite the efforts of lawmakers to mandate backdoors.
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