| 摘要 |
Executable software (30B) is protected by inserting an additional block of code (50), immediately after the header (30A). The block (50) is executable to analyse all or part of the structure (30) to determine whether or not any change has been made to the structure after the creation of the structure. For example, a CRC value may be checked. When the software (30B) is to be executed, the security block (50) executes first, to check if any changes have been made, such as by the effect of a virus. If this is detected, a compressed copy (52) is used to replace at least the program region (30B), prior to execution being handed to the block (30B). |
