R. Davidson and N. Myhrvold. Method and system for eneratin and au ditin a si natu re for a compu ter pro ram. U.S. Patent No. 5,559,884, 1996.  Home/Search   Document Not in Database   Summary   Related Articles

....marks in specificdatE We refer tw readert o [5] for a summary of suchtV hniques hent hedat is an image. A more recent and less dat specific survey can be found in [11] There have been very fe published result for soft are marking. 8] simply ritV a specific mark in a specific place int he file, [6] reorders blocks of inst uct ionst o form a signat ure. In [2] a good summary of exist ingt echniques is given, and amet4 d t mark code usingt he t pology of dynamic heap dat a s tuctfl e is presentes WhiletewV t echniquesti e advant age of tw st)OMfl4w of source orexecutwWfl code,t hey are, in ....

....eax,ebx mov ebx,ecx Similarly, ror eax,19 can be replaced by rol eax,13 provided e make suret he overflo and carry flags ill not bet estM furtwO in tw code. Widespread Modifications As already point ed out ,t he probably most nat ural idespread modificat)w is tw reordering of di#erent blocks [6]. Anot her possibilit y ist o modifyt he jump sequences: at ypical sequence hen at est is performed is: cmp eax,ebx jne Label A jmp Label B This can be replaced by: cmp eax,ebx je Label B jmp Label A It should be remembered ted any modificat2w t tc code, hich preserves it correctflfl3w and ....

R. Davidson and N. Myhrvold. Method and system for eneratin and au ditin a si natu re for a compu ter pro ram. U.S. Patent No. 5,559,884, 1996.

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