Question: a block cipher with a block size of 4 bits operates on a plaintext block of _ _ _ _ _ _ bits to produce

a block cipher with a block size of 4 bits operates on a plaintext block of ______ bits to produce a ciphertext block of _______ bits. there are a total of ___________ possible different plaintext blocks. for the encryption/decryption to be reversible (nonsingular), the total number of different transformations (mappings) between plaintexts and ciphertexts is ___________. for an ideal block cipher, the length of the key is approximately ________ bits.

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