CA TIA VS is one of the most preferred softwares in product design for domestic and industrial use. But with the development of the IT industry, design data by CATIA VS can easily be hacked and stolen especially via the internet and through assistance storage medium. The design data could be protected through executive, physical and technical security system. the best way to maintain confidentiality of data from unauthorized access is to have a cryptosystem of the technical security. In this paper, a cryptosystem for the protection of design data was being proposed.
The memory contains the file information made by the New and Open function of CATIA VS. No error can be expected even if the file changed before of after the application of Save and Open function. A cryptosystem was constructed in CATIA VS by inserting crypto algorithm before and after the I/O process. The encryption/decryption algorithm of each function was based on the complex cipher, which applied permutation cipher and transpose cipher. The file security system was programmed in CAA VS and Visual C++.
