The invention provides a network communication encryption method based on contents. Symmetrical encryption algorithms are respectively arranged at a sending end and a receiving end, and then steps are listed as follows: 1) the sending end confirms an encryption algorithm factor according to the contents in the current data to be sent, then the minimum number of bytes N needed by a secret key of the current encryption algorithm and a corresponding algorithm is selected according to the encryption algorithm factor, and then the current encryption secret key is obtained via calculation; 2) the sending end uses the current encryption algorithm and the current encryption secret key to encrypt the current data to be sent to obtain the current encryption data so that the current communication cipher is generated and sent; and 3) the receiving end receives the current communication cipher to obtain the corresponding decryption algorithm factor and data to be decrypted, and corresponding decryption is performed so that the current communication plaintext is generated. The adopted encryption algorithm number and the adopted secret key are selected according to the contents of the data to be sent via calculation without transmission of extra secret key information so that the method is simple and rapid and high in security.

Network communication encryption method based on contents

The invention discloses a method for encryption of a data segment. The method for encryption of the data segment comprises the steps of (1) dividing the data segment into a plurality of sub-data segments which correspond to the length of a secret key according to the length of the secret key used for encryption of the data segment, (2) as for each sub-data segment in the sub-data segments, carrying out encryption processing on each sub-data segment by using a reversible fixed length encryption algorithm according to the secret key so as to obtain an encrypted sub-data segment, and (3) combining the encrypted sub-data segments to obtain an encrypted data segment. The invention further discloses a corresponding method for decryption and a corresponding device for encryption and decryption.

Method and device for text encryption and decryption

The invention provides a user password mixing encryption method and system. The method comprises: performing an MD5 encryption algorithm on a user account with user characteristics for encryption operation, converting two characters in the middle of ciphertexts encrypted through MD5 into ASCII codes, by use of the remainder obtained through dividing the ASCII codes by 5, selecting a sequence and an encryption algorithm of next mixing encryption operation from a prestored correlation table of remainders and encryption algorithms, and finally obtaining the ciphertexts after mixing encryption operation of the user account and using the ciphertexts for verification of the user account. The method and the system ensure that each user account is corresponding to a particular encryption algorithm and a particular mixing encryption sequence so that the risks of declassification and leakage of the user accounts are substantially reduced, and the computer platform application safety is improved.

User password mixing encryption method and system

The invention relates to a cryptographic method of large files and belongs to the field of information security. The method takes into consideration of the huge data of the large files, is not suitable for all the encryption, and different encryption methods have different advantages and disadvantages, so full homomorphic encryption can not solve all of the delegates calculations, and encryption costs a lot, some require the use of misleading encryption, and some require only common symmetric encryption, so appropriate encryption is selected by subsection, and only partial data is encrypted by rule or selection. At the same time, the optimal scheme of reducing key management and ensuring security is proposed. The method requires only a small number of keys for file encryption and decryption.

Cryptographic method of large files

The invention belongs to the field of information security, relating to a large file encryption method. The method considers the phenomenon that a large file has huge data and is not suitable for full encryption, a large number of data will choose not to be encrypted, and in order to reduce the read and write of the data, especially the write, the method disclosed by the invention adopts the following steps: storing an original plaintext, covering part of the plaintext that is encrypted, and separately storing an encrypted ciphertext. As different encryption methods have different advantages and disadvantages, fully homomorphic encryption also cannot solve all delegated calculations, and a high cost of encryption is needed, an encryption mode with a misleading function is required for some data, and only a general symmetric encryption mode is required for other data, thereby, the appropriate encryption methods are segmentally selected as required, only part of the data needs to be encrypted according to rules or selections; and meanwhile, an optimum scheme for reducing key management and guaranteeing security is proposed, and thus the encryption and decryption of the files can be achieved by only using fewer keys.

Large file selective encryption method for reducing write

The invention belongs to a novel encrypting method, in particular relates to a method for encrypting in sections by using an uncertain encryption algorithm The method is used for encrypting the plain text in sections; and the algorithm for encrypting each section is uncertain and secret and determined by generalized keys The method adopts the generalized keys to determine the length of each section, the encrypting algorithm of each section, various keys and parameters Because the algorithm is uncertain, password analyzers do not know where to decrypt, though the analyzers get some information, the information means nothing to decrypt other sections

Method for encrypting in sections by using uncertain encryption algorithm

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Method for encrypting in sections by using uncertain encryption algorithm