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Steganography for the Computer Forensics Examiner. Contents. Abstract | Introduction | Null Ciphers| Digital Image and Audio | Digital Carrier Methods. Steganography Examples | Detecting Steganography | Steganography Detection Tools | Summary and Conclusions. References | Additional Websites | Companion Downloads | Commercial Vendors | Author's Bio. Abstract. Steganography is the art of covered or hidden writing. The purpose of steganography is covert communication- to hide the existence of a message from a third party.
This paper is intended as a high- level technical introduction to steganography for those unfamiliar with the field. It is directed at forensic computer examiners who need a practical understanding of steganography without delving into the mathematics, although references are provided to some of the ongoing research for the person who needs or wants additional detail. Although this paper provides a historical context for steganography, the emphasis is on digital applications, focusing on hiding information in online image or audio files. Examples of software tools that employ steganography to hide data inside of other files as well as software to detect such hidden files will also be presented. Introduction. Steganography is the art of covered or hidden writing. The purpose of steganography is covert communication to hide a message from a third party.
This differs from cryptography, the art of secret writing, which is intended to make a message unreadable by a third party but does not hide the existence of the secret communication. Although steganography is separate and distinct from cryptography, there are many analogies between the two, and some authors categorize steganography as a form of cryptography since hidden communication is a form of secret writing (Bauer 2. Nevertheless, this paper will treat steganography as a separate field. Although the term steganography was only coined at the end of the 1.
In ancient times, messages were hidden on the back of wax writing tables, written on the stomachs of rabbits, or tattooed on the scalp of slaves. Invisible ink has been in use for centuries- for fun by children and students and for serious espionage by spies and terrorists. Microdots and microfilm, a staple of war and spy movies, came about after the invention of photography (Arnold et al. Johnson et al. 2.
Kahn 1. 99. 6; Wayner 2. Steganography hides the covert message but not the fact that two parties are communicating with each other. The steganography process generally involves placing a hidden message in some transport medium, called the carrier. The secret message is embedded in the carrier to form the steganography medium. The use of a steganography key may be employed for encryption of the hidden message and/or for randomization in the steganography scheme.
In summary. steganography_medium = hidden_message + carrier + steganography_key. Figure 1. Classification of Steganography Techniques (Adapted from Bauer 2. Figure 1 shows a common taxonomy of steganographic techniques (Arnold et al. Bauer 2. 00. 2). Technical steganography uses scientific methods to hide a message, such as the use of invisible ink or microdots and other size- reduction methods.
Linguistic steganography hides the message in the carrier in some nonobvious ways and is further categorized as semagrams or open codes. Semagrams hide information by the use of symbols or signs. A visual semagram uses innocent- looking or everyday physical objects to convey a message, such as doodles or the positioning of items on a desk or Website. A text semagram hides a message by modifying the appearance of the carrier text, such as subtle changes in font size or type, adding extra spaces, or different flourishes in letters or handwritten text.
Open codes hide a message in a legitimate carrier message in ways that are not obvious to an unsuspecting observer. The carrier message is sometimes called the overt communication whereas the hidden message is the covert communication. This category is subdivided into jargon codes and covered ciphers. Jargon code, as the name suggests, uses language that is understood by a group of people but is meaningless to others.
Jargon codes include warchalking (symbols used to indicate the presence and type of wireless network signal [Warchalking 2. A subset of jargon codes is cue codes, where certain prearranged phrases convey meaning. Covered or concealment ciphers hide a message openly in the carrier medium so that it can be recovered by anyone who knows the secret for how it was concealed. A grille cipher employs a template that is used to cover the carrier message. The words that appear in the openings of the template are the hidden message. A null cipher hides the message according to some prearranged set of rules, such as "read every fifth word" or "look at the third character in every word.". As an increasing amount of data is stored on computers and transmitted over networks, it is not surprising that steganography has entered the digital age.
On computers and networks, steganography applications allow for someone to hide any type of binary file in any other binary file, although image and audio files are today's most common carriers. Steganography provides some very useful and commercially important functions in the digital world, most notably digital watermarking. In this application, an author can embed a hidden message in a file so that ownership of intellectual property can later be asserted and/or to ensure the integrity of the content.
An artist, for example, could post original artwork on a Website. If someone else steals the file and claims the work as his or her own, the artist can later prove ownership because only he/she can recover the watermark (Arnold et al. Barni et al. 2. 00. Kwok 2. 00. 3). Although conceptually similar to steganography, digital watermarking usually has different technical goals.
Generally only a small amount of repetitive information is inserted into the carrier, it is not necessary to hide the watermarking information, and it is useful for the watermark to be able to be removed while maintaining the integrity of the carrier. Steganography has a number of nefarious applications; most notably hiding records of illegal activity, financial fraud, industrial espionage, and communication among members of criminal or terrorist organizations (Hosmer and Hyde 2. Null Ciphers. Historically, null ciphers are a way to hide a message in another without the use of a complicated algorithm.
One of the simplest null ciphers is shown in the classic examples below. PRESIDENT'S EMBARGO RULING SHOULD HAVE IMMEDIATE NOTICE. GRAVE SITUATION AFFECTING INTERNATIONAL LAW. STATEMENT FORESHADOWS RUIN OF MANY NEUTRALS. YELLOW JOURNALS UNIFYING NATIONAL EXCITEMENT IMMENSELY. APPARENTLY NEUTRAL'S PROTEST IS THOROUGHLY DISCOUNTED AND IGNORED.
ISMAN HARD HIT. BLOCKADE ISSUE AFFECTS PRETEXT FOR EMBARGO ON BYPRODUCTS, EJECTING SUETS AND VEGETABLE OILS. The German Embassy in Washington, DC, sent these messages in telegrams to their headquarters in Berlin during World War I (Kahn 1. Reading the first character of every word in the first message or the second character of every word in the second message will yield the following hidden text. PERSHING SAILS FROM N.
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