A block cipher breaks down plaintext messages into fixed-size blocks
before converting them into ciphertext using a key. Encrypting
information bit-by-bit. A stream cipher, on the other hand, breaks a
plaintext message down into single bits, which then are converted
individually into ciphertext using key bits.Character streams are likebyte
streams, but they contain 16-bit Unicode characters rather than eight-bit
bytes. They are implemented by the Reader and Writer classes and their
