Abstract: Scalar multiplication is the heart of elliptic curve cryptosystems. In recent years,how to realize efficient scalar multiplication is a research focus of information security field. 13y means of the wMOF representations of scalar and the direct computation 2kQ}P strategy,we modified the scalar multiplication algorithm based on sliding window technolo- gy. The analysis results indicate that the efficiency of the algorithms is improved obviously and the storage requirements arc reduced, and it can enhance the ECC's efficiency.

Key words: Elliptic curve cryptosysytcm, Scalar multiplication, Sliding window technology, Direct computation