Crypto microprocessor for executing enciphered programs
Patent 4278837 Issued on July 14, 1981. Estimated Expiration Date: 
June 4, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 4, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3504132 3764742 3798359 3878331 3906460 3911216 Electronic security apparatus Block cipher system for data security Programmable cryptic device for enciphering and deciphering data Key controlled address relocation translation system InventorApplicationNo. 06/044952 filed on 06/04/1979US Classes:713/190, Computer instruction/address encryption200/61.08, Frangible or destructible type726/16Stand-aloneExaminersPrimary: Buczinski, S. C.Attorney, Agent or FirmInternational ClassesG06F 12/14 (20060101)G06F 21/00 (20060101) G06F 1/00 (20060101) AbstractA microprocessor for executing computer programs which are stored in cipher to prevent software piracy. Such a crypto-microprocessor deciphers the enciphered program piecemeal as it executes it, so that a large enciphered program can be securely executed without disclosing the deciphered program or associated data to persons who have access to the wiring of the computer in which the crypto-microprocessor is a component. Such a device may process valuable proprietary programs and data files which are distributed in cipher on videodiscs, semiconductor memory, or other media without risk of software piracy. Various methods of encryption may be used including methods which result in the cipher of a byte being a complicated function of the byte's address in memory. Each crypto-microprocessor chip may use a unique cipher key or tables for deciphering the program, so that a program that can be executed in one chip cannot be run in any other microprocessor.Other References
| |
