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Blowfish is a symmetric key encryption algorithm that was developed by Bruce Schneier in 1993. It uses a variable-length key (from 32 to 448 bits) to encrypt and decrypt data.

Blowfish is known for its fast encryption and decryption speeds and its resistance to brute force attacks. It is a widely used encryption algorithm that is used in a variety of applications, including secure communication, password storage, and data encryption.

To encrypt data using Blowfish, the sender of the message first creates a secret key that is used in conjunction with the Blowfish algorithm to encrypt the data. The key is then used to encrypt the data, and the same key is used to decrypt it.

To decrypt the data, the recipient of the message uses the same secret key that was used to encrypt the data. The key is used to decrypt the data, and the resulting plaintext message is revealed.

Blowfish is a relatively simple encryption algorithm, but it is considered to be very secure when used with a strong key. It has been widely analyzed and tested, and it has not been broken by any known attacks.