You can get a sense of it just by looking at the classic: https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_(ECB) https://en.wiki

You can get a sense of it just by looking at the classic: https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_(ECB) https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation... Look for penguin image in ECB mode. Encryption without randomness reveals the patterns! That image is highly educational and makes you think.