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Digital signatures rely on symmetric key cryptography. Before delving into digital signatures, let's review how symmetric key cryptography works. In asymmetric key cryptography, there are mathematically related key pairs. 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. A computer program generates a pair of keys for her. Sheila sends Albert one key and keeps the other. Albert can retrieve the key from a public place as well. Albert uses Sheila's public key to encrypt the message and sends it to her. Only Sheila can decrypt it with her private key.