Signal release uses a technique known as domain fronting

With today’s release, domain fronting is enabled for Signal users who have a phone number with a country code from Egypt or the UAE. When those users send a Signal message, it will look like a normal HTTPS request to www.google.com. To block Signal messages, these countries would also have to block all of google.com.

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Techniques such as this will be useful in distributing the SAFE Launcher to those people who need it most.

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