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Sharing encrypted data with different users via public cloud storage is an important research issue. This paper proposes a key-aggregate authentication cryptosystem. The cryptosystem generates a constant-size key that supports flexible delegation of decryption rights for any set of ciphertexts. The key-size is independent of the number of maximum ciphertexts such that the expense of our scheme is...
In cloud computing, data owners host their data on cloud servers, and users (data consumers) can access the data from the cloud servers. This new paradigm of data hosting service also introduces new security challenges that require an independent auditing service to check the integrity of the data in the cloud. Some existing methods for checking the integrity of the data cannot handle this problem...
Cloud computing becomes more and more popular and is applied into many practical applications because of much cheaper and more powerful features. In cloud system, users can outsource local data to the cloud servers to lighten their local storage and computing resource loads, which products a new industry method of use-on-demand, pay-on-use. However outsourcing data to cloud servers makes sensitive...
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