| 摘要 |
<p>The present invention discloses distributed dynamic key management methods and apparatuses. One of methods includes: a trusted center computes the sub-key of each sub-key manager and sends it to the corresponding sub-key manager, computes and publishes sub-key verification information of each sub-key manager at the same time; when a sub-key manager needs to update a sub-key, it selects the update part of its sub-key, updates its sub-key, computes its sub-key update verification information at the same time, and sends the sub-key update verification information to the trusted center. The other method includes: each sub-key manager computes its own sub-key according to a part of sub-keys sent by other sub-key managers and a part of sub-key generated by itself, computes and saves the sub-key verification information of the sub-key manager at the same time; when a sub-key of a sub-key manager needs to be updated, the sub-key update part is selected, the sub-key is updated, and the sub-key update part accumulation sum is computed and saved. The present invention improves the efficiency and security of the sub-key update.</p> |
