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This Unbreakable CIA Cipher Fooled the World for 37 Years. Then Two People Accidentally Solved It.
A single leaked hint exposed the CIA’s most puzzling code. But dozens of the world’s toughest ciphers are still waiting to be solved.
Every day, over 5 billion people exchange more than 100 billion messages across WhatsApp, Telegram, iMessage, and Signal.
Recognizing this need, major online messaging services use a technique called end-to-end encryption, to secure and protect users' conversations.
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