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Digital signatures rely on symmetric key cryptography. Before discussing digital signatures, it is important to understand how symmetric key cryptography works. This type of cryptography involves a pair of mathematically related keys - one key is used to encrypt a message, while the other key is used to decrypt it. In the case of Albert and Sheila, Sheila can send Albert a secret message by using an asymmetric pair of keys. She sends Albert one key, and keeps the other key for herself. Albert encrypts the message using the public key Sheila provided, and only Sheila can decrypt the message using the private key. This ensures secure communication between the two parties.