In cryptography, Block ciphers such as AES or DES are a symmetric key cipher operating on fixed-length groups of bits, called blocks, and typically operate on large input data blocks i.e. 64 or more than 128, 256 bits.
Block cipher encrypts Plain-text to Cipher-text by applying cryptographic key and algorithm to a block of data at once as a group rather than to one bit at a time, so that