2. What the child saw was the ciphertext, and the message (plaintext) was directly deciphered through the ciphertext without discussing whether it was true (but obviously it was fabricated). This can only show the incompetence of the cryptographic system or the lack of storytellers Common sense of password. Now all international standard cryptographic algorithms require selective ciphertext attacks, which means that a password breaker can not only get the ciphertext, but also the plaintext corresponding to the ciphertext. He still cannot crack the system. Such a system is safe.
3. The technology of a cryptographic system must be completely public, and its security only depends on the use of the secret key (key) of the cryptographic system. That extremely mysterious "mercury" system, go to hell, no one will use it. We must know that in the 1970s, the international encryption algorithm (DES) formulated by the United States was criticized and resisted by the people because it did not disclose the design principles. After that, all international encryption standards must disclose the design principles and open source code.
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