Encryption of control programs

Details Encryption of control programs Encryption of control programs

2001-11-13

2009-12-01

Vu, Kimyen (Department: 2435)

Cryptography

Video cryptography

Video electric signal modification

C713S150000, C713S189000, C713S191000

Reexamination Certificate

active

07627119

ABSTRACT:
In order to protect control programs against unauthorized analysis and use during transport via public networks, asymmetrical keys are used. Following the compilation of the control program in the engineering system belonging to the supplier, the program is encrypted in a postprocessor and exported into a public web server. The customer loads the encrypted program into his long-term data holder, imports it into his engineering system and can edit it there in order to configure the control system. Only after editing are the encrypted parts of the program decrypted in a preprocessor and forwarded to the compiler.

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Tatsuo Miyazawa et al.'s, “An Advanced Internet XML/EDI Model Based on Secure XML Documents” in Parallel and Distributed Systems: Workshops, Seventh International Conference on 2000, pp. 295-300, Jul. 4-7, 2000.

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