Explaining one of the simplest and historically well-known ciphers, the Caesar cipher, Holden establishes the key mathematical idea behind the cipher and discusses how to introduce flexibility and ...

Looking for reliable encryption tools? Explore the seven best software picks for securing data across devices, platforms, and teams.

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Using a VPN, or virtual private network, is one of the best ways to protect your online privacy. We review dozens every year, and these are the best VPNs we've tested.