Code:MOV BL,88 NEG BL ROR BL,4 NOT BL XOR BL,AL NOT BL ROR BL,4 NEG BL MOV EAX, "start of your code to crypt" INC BL XOR BYTE PTR DS:[EAX],BL <<<<<<<<<<< *theseadress INC EAX CMP EAX,"end of your code to crypt" JLE adress of *theseadress <<<<<<<<<<< any kind of jump to your OEP