A revocable cloud data security sharing method
A cloud data and security technology, applied in the field of revocable cloud data security sharing, can solve the problems of large amount of calculation and high cost of shared keys
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[0032] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0033] A revocable method for secure sharing of cloud data such as figure 1 described, including the following steps:
[0034] Step 1: The cloud server generates the public parameters of the system and the master key of the system;
[0035] Step 2: The cloud server generates a corresponding private key for each user id;
[0036] Step 3: The data owner encrypts the data M to be shared into ciphertext C and uploads it to the cloud server;
[0037]Step 4: The data owner generates a shared key for the initial shared user list S and uploads it to the cloud server;
[0038] Step 5: Does the data owner need to revoke some shared users? If so, go to step 6; if not, go to step 7;
[0039] Step 6: The cloud server receives the shared user list R that needs to be revoked from the data owner, obtains a new shared user list S'=S-R, and generates a n...
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