2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223805we will present an estimation for the upper-bound of the amount of 16-bytes plaintexts for English texts, which indicates that the block ciphers with block length no more than 16-bytes will be subject to recover plaintext attacks in the occasions of plaintext -known or plaintext-chosen attacks.there is a remark addedCryptography and SecurityRecover plaintext attack to block cipherstext