Software has been developed very fast as information has become important value Illegal software copy h a s been the main problem of developing software business Recently used protecting lock system for software copy has not guaranteed perfectly from ...
Software has been developed very fast as information has become important value Illegal software copy h a s been the main problem of developing software business Recently used protecting lock system for software copy has not guaranteed perfectly from easily cracked-defense system Therefore this paper proposed 96-bit block cipher with 112-bit length to replace DES(Data Encryption Standard) algorithm Security chip by ASIC(Application Specific Integrated Circuit) security module was presented for software copy protection Finally auto block protecting algorithm was designed for the security chip