Obfuscation of executable code

Details Obfuscation of executable code Obfuscation of executable code

2007-08-28

2007-08-28

Moazzami, Nasser (Department: 2136)

Information security

Prevention of unauthorized use of data including prevention...

C713S164000, C713S167000, C713S189000, C713S193000, C713S194000, C717S108000, C717S118000, C717S137000, C717S147000

Reexamination Certificate

active

10019828

ABSTRACT:
Three new obfuscation techniques. Data field obfuscation replaces references to data fields that use an object name and a field name with references that use an object name but do not use a field name. Obfuscation using the reflection mechanism for the executable code works by replacing a construct in the executable code with one or more equivalent constructs made using the reflection mechanism. Obfuscation of externally-defined constructs is done by relating the externally-defined construct to an obfuscation for the construct that is used within the executable code. The relationship is defined in a portion of the executable code, and at least the externally-fined construct is encrypted in the portion. The various obfuscation techniques may be used with each other or with other previously-known obfuscation techniques. The disclosed obfuscation techniques are particularly well-adapted for use with the byte codes produced by Java language compilers from Java language programs.

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