6 HASH FUNCTIONS
Hash functions—such as SHA-256, SHA3, and BLAKE3—compose the cryptographer’s Swiss Army Knife: they are used in digital signatures, public-key encryption, integrity verification, message authentication, password protection, key agreement protocols, and many other cryptographic protocols.
Whether you’re encrypting an email, sending a message on your mobile phone, connecting to an HTTPS website, or connecting to a remote machine through a virtual private network (VPN) or Secure Shell (SSH), a hash function is somewhere under the hood.
Hash functions are by far the most versatile and ubiquitous of all crypto algorithms. Their ...
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