Multi-user encryption data comparable encryption method and encryption data method

• Main Authors: XIE QIAOCHU, TANG ZIJIAO, YE JUN, LI LIUFEN, SU YUEBIN, LAN JIMING, ZHANG HAIYAN
• Format: Patent
• Language: English
• Published: 07.10.2015
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention provides a multi-user encryption data comparable encryption method and an encryption data method. When a user Uj needs to compare data of an L type with the data of the L type of a user Ui, the user Uj transmits a comparison request. After the user Ui receives comparison request, the label conversion information KLi of the data of the L type is transmitted to the user Uj of the comparison request is met. The user Uj employs the label conversion information KLi, enables a label to be converted into a label TLj, and generates comparable encryption data MLj for comparison. The comparable encryption data MLi is compared with the comparable encryption data MLj, and the user Uj obtains the comparison results. The methods achieve the comparison of ciphertexts obtained through different encryption keys under the multi-user condition with different mechanisms and a condition that data decryption is not needed.