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How many keys are required when using symmetric encryption?

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

Based on my research, symmetric encryption is a type of encryption where only one key (a secret key) is used to both encrypt and decrypt electronic data. The same key is shared between the sender and the receiver of the message, and they must keep it secret from anyone else. Therefore, only one key is required when using symmetric encryption.


Symmetric encryption has some advantages and vulnerabilities. Some of the advantages are:

- It is fast and efficient, as it can handle large amounts of data with less computational resources.

- It provides confidentiality, as only the parties who have the secret key can access the encrypted data.

- It is simple and easy to implement, as it does not require complex mathematical operations or public key infrastructure.


Some of the vulnerabilities are:

- It requires a secure method to distribute and store the secret key, as anyone who obtains it can decrypt the data.

- It does not provide authenticity, integrity, or non-repudiation, as anyone who has the secret key can encrypt or decrypt any message without being detected.

- It is susceptible to known-plaintext attacks, chosen-plaintext attacks, differential cryptanalysis, and linear cryptanalysis.

Some examples of popular symmetric encryption algorithms are AES, DES, 3DES, Blowfish, RC4, and ChaCha20.

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