What key does the receiver need in symmetric encryption to decrypt data?

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In symmetric encryption, the same key is used for both encryption and decryption. This means that the key utilized to encrypt the data is exactly what the receiver needs to decrypt it. If the receiver has the correct key that matched the one used in the encryption process, they can successfully decrypt the data back to its original form.

In contrast, the other options represent keys associated with different encryption methods or concepts. The sender's public key is relevant in asymmetric encryption, where one key is public and the other private. A randomly generated security key could refer to many different types of keys used in various cryptographic contexts, but it does not convey the fact that the key must be the same one used for the encryption in symmetric encryption. Lastly, the receiver's own private key is again applicable in asymmetric encryption, where a private key corresponds with a public key for decryption purposes. In symmetric encryption, the focus remains on the single shared key that both parties possess.

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