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کامپیوتر و شبکه::
متن ساده
iii) how to recover the plaintext data when the access right needs to be jointly granted by multiple users?
First, a plaintext data is bound to a secret that is shared by all legitimate users of the data based on (t, n)-threshold secret sharing, and a message certificate is computed for the data based on the NTRU encryption; the ciphertext is produced from both the shared secret and the message certificate.
Third, the plaintext data can be obtained when at least t 1 other users participate in the recovery process and provide correct information for the data recovery, based on (t, n)-threshold secret sharing.
A user can recover the plaintext data if and only if it obtains the message certificate from the data owner and holds at least t pieces of the access rights (with the help of at least t 1 other legal users), where t is a threshold designated by the data owner for access control based on (t, n)-threshold secret sharing.
- it cannot obtain the data owner's original plaintext data.
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