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Let us consider the block cipher type of symmetric encryption. The basic idea is that you...

Let us consider the block cipher type of symmetric encryption. The basic idea is that you have a block of plaintext (for example, 128 bits) and a key (for example, 128 bits) as inputs to the encryption algorithm. The output will be a block of cipher-text (for example, 128 bits). If the encryption algorithm does not conduct compression, the output block size will be at least as large as the plaintext block (in other words, the cipher text is of the same size or longer than the plaintext.) Please explain why it is like this.

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Answer #1

Compressing before encryption is better because compression removes all the redundant strings of characters in the respective file. So the compressed file has a more uniform distribution of characters.

This thing will provide you a  shorter ciphertext and plaintext, which will reduce the time to be spent on encryption, decryption the file.

so we can conclude that encrypting and then compressing is not efficient.

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