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Cloud computing enables users to easily store their data and simply share data with others. Due to the security threats in an untrusted cloud, users are recommended to compute verification metadata, such as signatures, on their data to protect the integrity. Many mechanisms have been proposed to allow a public verifier to efficiently audit cloud data integrity without receiving the entire data from...
An identity-based sequential aggregate signature (IBSAS) scheme provides a shorter aggregate signature for multiple signers in which each signer has signed his/her own message and all generated signatures are aggregated in sequence. During aggregate signature verification process, a verifier can identify the generated order and the validity of signatures. In 2012, Dou et al. first proposed two new...
With data services in the cloud, users can easily modify and share data as a group. To ensure data integrity can be audited publicly, users need to compute signatures on all the blocks in shared data. Different blocks are signed by different users due to data modifications performed by different users. For security reasons, once a user is revoked from the group, the blocks, which were previously signed...
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