Central control node in distributed cloud storage system

The invention provides a central control node in a distributed cloud storage system. The central control node manages file index and can calculate storage parameters according to an uploaded file, sothat the whole system is ensured to be clear in work division and distinct in business logic, and a client side is enabled to quickly acquire needed information and efficiently interact with the storage node. The central control node only stores index and does not store specific data, so that the running process of the system is monitored, and data acquiring attack on the control node by the outside fails. Data after being safely coded and blocked are intelligently distributed into different storage nodes by the control node, and a distribution mode is stored in the central control node afterbeing encrypted, so that network attack aiming at the storage nodes has no way to start, and safety of the system is realized through mutual cooperation of these two aspects. In addition, the centralcontrol node adopts a multi