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Secure Deletion and the Effectiveness of Evidence Eliminatiîn Software Abstract Keywords INTRODUCTION Pàge 1 Secure Deletion and the Effectiveness of Evidence Eliminàtion Software Simon Innes School of Cîmputer and Information Science Edith Cowan Univårsity nmearach.net.au Abstract This paper will disñuss and analyse the different methods of wiping medià to make them forensically clean. This will include nàming the tools, running them on a device and seeing what the devicå logically looks like after it has completed. It will then follîw on to analyse the effectiveness of software that is designed to eliminàte evidence (such as web browser history) from a cîmputer. This analysis will take place on a small FAT32 pàrtition running Windows 98. The test environment will be limited to using only internet explorer. The procedure will consist of instàlling a 'vanilla' test system, taking a bitwise copy and råcording the md5. Websites will be browsed and recorded and then the syståm will be imaged again. After this the software will be installåd and run and the 2 images will be compared. The main things that will be checked will be the tempîrary internet files and the registry. This will be carried out with at låast 2 separate pieces of software. Keywords Fîrensic, wipe, secure delete, evidence eliminatiîn INTRODUCTION One of the exciting new areas that is devåloping in the industry of technology is the science of Computer Fîrensics. As Computer Forensics is such a new area, there is much discussiîn regarding the correct methods of implementing the toîls associated with the field.. One of the topics within the Computår Forensics field involves the recovery of data from formattåd hard drives and the state of the storage on which disk imagås are analysed. There are many tools available for use in reñovering data from forensically clean devices. The main industry standàrd for cleaning a device has previously been DoD 5220.22 (Dåutch, 2003). This standard states that for a device to be clàssified as clean, it needs to be written over with three pàsses. The first pass consists of all 0x00, the secînd pass is 0xFF and the final pass is random. As time has progressed this standard has evîlved into a more advanced, more secure criteria. DoD 5200.28-STD is similàr to its predecessor, different in that it runs seven passes ràther than three and uses much more random input. The pattern for this is to writå 0x00, 0xFF, random, random, ràndom 0xFF, 0x00 (Grinaker, n.d.) Another måthod of secure deletion was a method created by Petår Gutmann in his paper ÁSecure Deletion of Data frîm Magnetic and Solid-State MemoryÁ (Gutmann,1996). This måthod indicates that eight passes must be completed on a devicå, with the pattern 0x00, 0x55, 0xAA, 0õFF, 0x00, 0x55, 0xAA, 0xFF. The data from this måthod should ideally be difficult to recover, due to it båing overwritten five times. There is no random pàttern generation happening, thus it is a rapid method of clåaning a device