| SCESW scheme is a tuple of algorithms including KeyGen, Par, Der, Enc, Cmp, |
| which are shown as follows: |
| (i) KeyGen: given the security parameter , range parameter and master |
| key , the DO runs the algorithm to output the master key and public |
| parameter . |
| (ii) Par: given the number , the DO runs the algorithm to output the number |
| rewritten through its binary code by utilizing sliding window method, |
| where represents the window size, is the number of blocks and |
| ; |
|
| (iii) Der: given the security parameter , range parameter , |
| master key and num , the DO runs the algorithm to output a token . |
| (iv) Enc: given the security parameter , range parameter , |
| master key and num , the DO runs the algorithm to generate |
| the ciphertext and submits it to the CSP. |
| (v) Cmp: given the public parameter , two ciphertexts |
| and , and token , the CSP outputs , then it returns the relevant |
| search results to the user. |
