Alignment password system, direct communication method and indirect communication method

Abstract

The invention discloses an alignment password system and a direct communication method and an indirect communication method based on the system. The system is similar to but not equivalent to symmetric passwords and is high in safety, rapid to use and universal, and the system comprises more than one dynamic password table and further can comprise an annexed table of the password table; only after the tagmeme where a plaintext character set or a ciphertext character set is located is aligned, the plaintext character set or the ciphertext character set can be encrypted, the system comprises three-dimensional alignment passwords, and at least two identical systems are arranged.

Description

technical field [0001] The present invention relates to a cipher, a method of direct communication, a method of indirect communication, especially a pair cipher system which is not equal to symmetric cipher. Background technique [0002] Ciphers are mainly divided into symmetric ciphers and asymmetric ciphers. Symmetric cipher means that both parties or parties to the communication have the same key (for encryption and decryption), such as permutation ciphers and substitution ciphers (substitution ciphers) in classical ciphers, such as block ciphers (DES, AES, etc.) or sequence Ciphers (RC4, etc.); in general, symmetric ciphers are usually very fast and suitable for long texts, but are vulnerable, easily cracked, or not sufficiently secure. [0003] The block cipher or sequence cipher needs to be calculated; the sequence cipher is insensitive to insertion and modification; the CBC mode (ciphertext link mode), CFB (ciphertext feedback mode), and OFB (output feedback mode) in...

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Problems solved by technology

[0003] The block cipher or sequence cipher needs to be calculated; the sequence cipher is insensitive to insertion and modification; the CBC mode (ciphertext link mode), CFB (ciphertext feedback mode), and OFB (output feedback mode) in the block cipher are not conducive to parallel computing , There is error transmission (one plaintext unit damage affects multiple units), in ECB (electronic codebook mode): (1) if the plaintext is repeated, the corresponding ciphertext will also be repeated, (2) the ciphertext content is easily replaced , rearrange, delete, replay

[0004] The single-table substitution cipher in the described substitution cipher includes a general single-table substitution cipher, a shift cipher, an affine cipher, and a key phrase cipher; when encrypting and decrypting, it uses a fixed substitution table (substitution table or substitution table is Key), is to use a fixed mapping for all letters in the plaintext. The disadvantage is that the frequency distribution of a single letter is the same as that in the ciphertext, and it is difficult to resist frequency analysis.

[0006] The asymmetric encryption, for example, the current mainstream asymmetric encryption algorithm RSA (public key encryption algorithm, has been used in the bank's USBKey, such as U shield), anti-attack, difficult to be cracked, relatively high security, but its encryption The key length is 1024 bits or 2048 bits, which leads to relatively slow calculation and even relatively large power consumption. It is only suitable for small data and is not universal (mainly not convenient for mobile use)

Of course, asymmetric ciphers can be used in combination with symmetric ciphers. For example, while the private key in the RSA algorithm is used for digital signatures, it can be used to encrypt symmetric ciphers, but the symmetric cipher needs to be changed frequently, and the RSA algorithm is not convenient for mobile use. , so, still not ideal

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