Yep. I could have said Telegram who hasn't been proved to leak anything for years, but that isn't accepted here as there was a flaw in their crypto in an early

Yep. I could have said Telegram who hasn't been proved to leak anything for years, but that isn't accepted here as there was a flaw in their crypto in an early version (remember, a year or so after WhatsApp was caught sending messages in cleartext over port 443!)