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Information processing method, terminal, central device, server and storage medium

An information processing method and a technology of central equipment, which are applied to secure communication devices and key distribution, can solve problems such as third-party organizations, user privacy leakage, and large calculations of user equipment, so as to improve encryption efficiency, reduce calculations, and improve security. sexual effect

Active Publication Date: 2022-06-03
CHINA MOBILE SUZHOU SOFTWARE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the attribute-based encryption (ABE) mechanism proposed by Sahai and Waters, users can use the private key related to their own attributes to decrypt the data, so that users can obtain different access rights according to their own attributes and protect user privacy. Currently, when a user is revoked or a certain attribute of the user is revoked, the access rights of the revoked user or the user whose attribute is revoked can be restricted by updating the private key of the user who has not revoked or the user whose attribute has not been revoked, however, if a third-party organization To update the user's private key, the private key components related to the user's attributes in the user's private key may be viewed by a third-party organization, resulting in leakage of user privacy. If the user's private key is updated by the user's device itself, the calculation of the user's device will be too large. Affect the operating efficiency of user equipment

Method used

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  • Information processing method, terminal, central device, server and storage medium
  • Information processing method, terminal, central device, server and storage medium
  • Information processing method, terminal, central device, server and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] S205, sending the second private key to the decryption terminal for use by the decryption terminal during decryption.

[0108] It should be noted that the second private key is related to the attribute, and therefore, is also related to the corresponding attribute random number.

[0113] Wherein, the system attribute set is a set of all attributes, and these attributes are attributes that users can have, for example

[0117]

[0121]

[0122]

[0126] Based on the above-mentioned embodiment, the embodiment of the present application also provides an optional information processing method, as shown in FIG. 5, the

[0135] S601, receive the attribute revocation information sent by the decryption terminal;

[0137] S602, obtain a user attribute revocation list; the user attribute revocation list represents the user of the terminal whose attribute has been revoked

[0140] S604, sending the updated user attribute revocation list to the decryption terminal for use in decryption b...

Embodiment 2

[0143] The embodiment of the present application provides an optional information processing method, which is applied to a decryption terminal. As shown in FIG. 7, this method

[0147] S704, using the first private key and the second private key, decrypt the ciphertext to obtain the plaintext.

[0148] In this embodiment of the present application, the user usually places the ciphertext on the storage server for other users to view, and also

[0157]

[0178] S1201, receive the re-encrypted ciphertext through the storage server;

[0179] S1202, receive the updated first private key through the proxy server;

[0180] S1203, using the updated first private key and the second private key, decrypt the re-encrypted ciphertext to obtain the plaintext.

Embodiment 3

[0184] This embodiment of the present application provides an optional information processing method, which is applied to an encrypted terminal. As shown in FIG. 13 , this method

[0188] S1304, sending the ciphertext to the storage server, so that the decryption terminal can obtain the ciphertext through the storage server.

[0194] S1403, according to the plaintext, the system public key and the sixth random number, generate a main ciphertext component;

[0200]

[0201]

[0202]

[0205]

[0206] wherein, the polynomial for accessing the leaf nodes of the structure tree is based on the polynomial q of the root node R

[0209]

[0210] Then, define a polynomial q for the next level node x that accesses the root node of the structure tree

[0214] Let x represent a node in the access tree τ, and i represent an attribute of node x.

[0216]

[0218]

[0219]

[0221]

[0222] If i∈S, and i is in the user attribute revocation list, the output recursive operation result is empty, nam...

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PUM

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Abstract

The embodiment of the present application discloses an information processing method. The central device acquires the master key and the user attribute set, acquires the user attribute of the decryption terminal from the user attribute set, and generates the first private key corresponding to the decryption terminal according to the user attribute and the master key. and the second private key, wherein the first private key has nothing to do with the user attribute of the decryption terminal, the second private key is related to the user attribute of the decryption terminal, and the first private key is sent to the proxy server for the proxy server to assist the decryption terminal in decrypting, Send the second private key to the decryption terminal for use in decryption by the decryption terminal. In this way, by updating the first private key, the user authority can be updated, which reduces the amount of calculation, improves encryption efficiency, and improves user information. security.

Description

Information processing method, terminal, central equipment, server and storage medium technical field The application relates to data encryption technology field, relate in particular to a kind of information processing method, terminal, central equipment, service servers and storage media. Background technique With the development of cloud computing technology, users usually put data on the cloud server, and complete the distribution through the cloud server. Distributed computing, thereby releasing local resources and using local resources for required applications, at the same time, other users log in to cloud services The server can apply for access to these data and realize data sharing with other users. Therefore, when the data uploaded by users is more private When high, the data put into the cloud server needs to be encrypted to protect user privacy. [0003] Based on the attribute-based encryption (ABE) mechanism proposed by Sahai and Waters, users can use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
CPCH04L9/0891H04L9/0894H04L2209/76
Inventor 沈强磊
Owner CHINA MOBILE SUZHOU SOFTWARE TECH CO LTD