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Digital signatures rely on symmetric key cryptography. Before discussing digital signatures, let's review how symmetric and asymmetric key cryptography work. In asymmetric cryptography, there is a pair of mathematically related keys. If a message is encrypted with one key, only the other key can decrypt it. For example, Sheila wants Albert to send her a secret message. She needs a pair of keys, one she sends to Albert and one she keeps for herself. Instead of sending the key, she can put it in a public place for Albert. Albert uses the public key to encrypt his message, which Sheila can decrypt with the matching private key she has.