Data is encrypted and decrypted using the same key in symmetric encryption (also known as pre-shared key encryption). To communicate, both the sender and the recipient must the same key.
Symmetric encryption is a type of encryption that encrypts and decrypts digital data using the same secret key. To exchange the key and use it for decryption, the parties using symmetric encryption must communicate.
Therefore, Symmetric key sizes typically range from 128 to 256 bits; the bigger the key size, the more difficult it is to decrypt the key.
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