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Digital signatures use symmetric key cryptography. In asymmetric key cryptography, there are mathematically related key pairs. To send a secret message, Albert needs a pair of keys from Sheila. Sheila can generate these keys through a computer program and send one key to Albert, keeping the other. Alternatively, she can place the key in a public location for Albert to retrieve. Albert uses the public key to encrypt the message, which only Sheila can decrypt using the private key.