Define Block Cipher
Define Block Cipher? Briefly explain it.
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A block cipher converts a fixed-length block of plaintext data into a block of cipher-text data of similar length. This transformation occurs beneath the action of a user-provided secret key. Decryption is executed by applying the reverse transformation to the cipher-text block employing similar secret key. The fixed length is termed as the block size, and for many block ciphers, the block size is of 64 bits.
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Public Key Encryption: Public key encryption employ public and private key for encryption and decryption. In this method, public key is employed to encrypt messages and merely the corresponding private key can be employed to decrypt them. To encrypt a
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