How many keys are required when using symmetric encryption?

Question: How many keys are required when using symmetric encryption?

Symmetric encryption is a technique that uses the same key for both encrypting and decrypting data. This means that only one key is required for symmetric encryption. The key must be shared between the sender and the receiver of the data, and must be kept secret from anyone else. Symmetric encryption is faster and more efficient than asymmetric encryption, which uses two different keys for encryption and decryption. However, symmetric encryption also has some drawbacks, such as the difficulty of securely distributing and managing the key, and the lack of non-repudiation and digital signatures.

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