Streaming encryption method for text data reservation format

Abstract

The invention provides a streaming encryption method and device for a text data reservation format. The method comprises the following steps: reading plaintext characters in text data; converting theplaintext character into a uniform code; judging whether a character set to which the plaintext character converted into the uniform code belongs is a filtered character set or not; if the character set is the filtering character set, directly outputting the current plaintext character; if the character set is a non-filtering character set, performing format-reserved obfuscation processing on thecharacters in the password table corresponding to the plaintext characters to obtain an updated password table; searching an encrypted character corresponding to the plaintext character in the updatedpassword table; and taking the plaintext character and the encrypted character which are directly output as final encrypted text data. According to the method, the filtering characters and the non-filtering characters are used, so that the plaintext characters are encrypted in a targeted manner, the consistency of character formats is controlled in a finer and richer manner. The method is more suitable for encryption on network transmission through one-by-one character encryption, and the encryption and decryption efficiency is improved.

Description

technical field [0001] The invention relates to the field of data security, in particular to a method and device for stream encryption aiming at preserving the format of text data. Background technique [0002] In the actual development process, there will be such requirements: for example, a lot of historical data has been stored in the database, and now it is required to encrypt and store these data. If you use the current general encryption algorithm, all algorithms will become binary after encryption, so you need to change the data type of all fields to BLOB. If you change the binary into base64 string storage, you also need to change the data type to TEXT or CHAR type. . This method has a huge workload and high cost. In large-scale projects, this method is basically impossible to complete, so we can only choose other compromise confidentiality schemes. [0003] The general-purpose encryption algorithm cannot maintain the original plaintext format. After encryption, it...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing encryption algorithm cannot maintain the original plaintext format and cannot efficiently search the ciphertext, the present invention provides a stream encryption method and device for retaining the format of text data

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