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Download Computer Forensics: Investigating Data and Image Files by EC-Council PDF

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The pc Forensic sequence via EC-Council offers the data and abilities to spot, music, and prosecute the cyber-criminal. The sequence is made from 5 books masking a vast base of subject matters in machine Hacking Forensic research, designed to reveal the reader to the method of detecting assaults and amassing facts in a forensically sound demeanour with the rationale to document crime and forestall destiny assaults. newcomers are brought to complicated ideas in laptop research and research with curiosity in producing strength felony facts. In complete, this and the opposite 4 books supply coaching to spot facts in machine comparable crime and abuse situations in addition to song the intrusive hacker's direction via a shopper process. The sequence and accompanying labs support arrange the safety scholar or specialist to profile an intruder's footprint and assemble all priceless details and facts to help prosecution in a court docket of legislation. Investigating info and photo documents presents a uncomplicated realizing of steganography, info acquisition and duplication, encase, the way to recuperate deleted records and walls and picture dossier forensics.

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Nevertheless, embedded data could become damaged. Some other popular algorithms, namely Windows Bitmap (BMP) and Graphic Interchange Format (GIF), are considered lossless compressions. The compressed image is an exact representation of the original. Detecting Steganography The following indicators are likely signs of steganography: • Software clues on the computer: The investigator should determine the filenames and Web sites the suspect used by viewing the browser’s cookies or history. An investigator should also look in registry key entries, the mailbox of the suspect, chat or instant messaging logs, and communication or comments made by the suspect.

The following steps illustrate the working of an embedding algorithm: 1. The secret information is compressed and encrypted. 2. Based on a pseudorandom number, a sequence of pixel positions, which is initialized with a passphrase, is created. 3. By using a graph-theoretic matching algorithm, the application finds pairs of positions so that exchanging their values has the effect of embedding the information. 4. The pixels at the remaining positions are also modified to contain the embedded information.

Stegomagic Stegomagic (Figure 1-31) is a steganography tool that uses text, WAV, 24-bit BMP, and 256-color BMP files to hide data. The size of the cover file remains the same except in the case of text files. Data is encrypted and protected with a password using the DES algorithm and it is subsequently hidden behind the cover file. It supports all Microsoft Windows environments. Hermetic Stego The Hermetic Stego tool (Figure 1-32) hides data files in either a single image or a set of BMP images.

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