Information security method and system

A system for modifying the compiled code of an application program for executing on a computer to improve computer security while substantially preserving the application's original operational and functional characteristics, comprising:

• means for providing compiled code;
• means for scanning said compiled code for candidate instructions for substitution;
• means for substituting randomly generated, functionally isomorphic code in place of said candidate instructions to generate a code polymorph, wherein the randomly generated, functionally isomorphic code is generated by random selection from a plurality of candidate codes that are substantially functionally isomorphic to the compiled code;
• means for securely executing the first code polymorph comprising:
• means for generating a first CRC of at least one system file at the time of code polymorph execution initialization;
• means for generating a second CRC of said system file(s) while said code polymorph is executing;
• and
• meams for comparing said first CRC and said second CRC to determine if code access attempts are being made.

A system for modifying the compiled code of an application program for executing on a computer to improve computer security while substantially preserving the application's original operational and functional characteristics, comprising:

• means for providing compiled code;
• means for substituting random context instruction codes for original CPU instructions that form a portion of said compiled code;
• and
• means for correlating said random context instruction codes to said original CPU instructions in order to recover said original CPU instructions, wherein a virtual CPU pre-processor uses a matchable data structure for correlating said random context instruction codes to said original CPU instructions, the matchable data structure being randomly created when the application initializes.

A method for modifying the compiled code of an application program for executing on a computer to improve computer security while substantially preserving the application's original operational and functional characteristics, comprising the steps of:

• providing compiled code;
• substituting random context instruction codes for original CPU instructions that form a portion of said compiled code;
• and
• correlating said random context instruction codes to said original CPU instructions in order to recover said original CPU instructions, wherein a virtual CPU pre-processor uses a matchable data structure for correlating said random context instruction codes to said original CPU instructions, the matchable data structure being randomly created when the application initializes.