Method to protect secrets against encrypted section attack

Details Method to protect secrets against encrypted section attack Method to protect secrets against encrypted section attack

2011-08-30

2011-08-30

Chea, Philip J (Department: 2492)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Computer instruction/address encryption

C713S171000, C380S045000

Reexamination Certificate

active

08010804

ABSTRACT:
A method, system, and computer-usable medium are disclosed for controlling unauthorized access to encrypted application program code. Predetermined program code is encrypted with a first key. The hash value of an application verification certificate associated with a second key is calculated by performing a one-way hash function. Binding operations are then performed with the first key and the calculated hash value to generate a third key, which is a binding key. The binding key is encrypted with a fourth key to generate an encrypted binding key, which is then embedded in the application. The application is digitally signed with a fifth key to generate an encrypted and signed program code image. To decrypt the encrypted program code, the application verification key certificate is verified and in turn is used to verify the authenticity of the encrypted and signed program code image. The encrypted binding key is then decrypted with a sixth key to extract the binding key. The hash value of the application verification certificate associated with the second key is then calculated and used with the extracted binding key to extract the first key. The extracted first key is then used to decrypt the encrypted application code.

REFERENCES:
patent: 2002/0053024 (2002-05-01), Hashimoto et al.
Davis, Don “Defective Sign & Encrypt in S/MIME, PKCS#7, MOSS, PEM, PGP, and XML” Proceedings of the General Track: 2002 USENIX Annual Technical Conference, Year of Publication: 2001, ISBN:1-880446-09-X, pp. 65-78 (21 pages) www.world.std.com/˜dtd/sign—encrypt/sign—encrypt7.html.
Zhang, Zhenfeng and Denggup Feng “Key Replacement Attack on a Certificateless Signature Scheme” Cryptology ePrint Archive, Report 2006/453 (5 Pages) eprint.iacr.org/2006/453.pdf.

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