Fig. 7From: PP-DDP: a privacy-preserving outsourcing framework for solving the double digest problemThe flowchart of PP-DDP. Step 1: privacy protecting. Step 2: public transferring. Step 3: cloud computing. Step 4: public transferring. Step 5: solution extracting. OPHI is the order-preserving homomorphic index scheme, and QIGA is the quantum inspired genetic algorithmBack to article page