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cryptography first appeared as the natural result of the invention of the written word; its use in diplomatic messages, business strategy, and battle plans certainly supports the theory. In data communications and telecommunications, encryption is required any time the information to be conveyed is sensitive and the possibility exists that the transmission medium is insecure. This can occur over any network, although the Internet is most commonly cited as being the most insecure of all networks. All secure networks require a set of specific characteristics if they are to be truly secure. The most important of them are listed here:
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Privacy/confidentiality: The ability to guarantee that no one can read the message except the intended recipient Authentication: The guarantee that the identity of the recipient can be verified with full confidence Message integrity: Assurance that the receiver can confirm that the message has not been changed in any way during its transit across the network Nonrepudiation: A mechanism to prove that the sender really sent this message and that it was not sent by someone pretending to be the sender
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Cryptographic techniques, including encryption, have two responsibilities: They ensure that the transmitted information is free from theft or any form of alteration and provide authentication for both senders and receivers. Today, three forms of encryption are most commonly employed: secret-key (or symmetric) cryptography, public-key (or asymmetric) cryptography, and hash functions. How they work is beyond the scope of this book, but there are numerous resources available on the topic. One of the best resources is An Overview of Cryptography by my good friend Gary Kessler. The paper, which Kessler updates routinely, is available at www.garykessler.net/library/crypto.html. Another interesting encryption technology that has taken on an air of some importance in the last few years is a technique called steganography. Steganography is a technique used to surreptitiously hide one message inside another. The name derives from Johannes Trithemius s Steganographia, published in 1621, a work on cryptography and steganography that was, in fact, disguised as a book on black magic. Steganographic messages are typically encrypted before being embedded in another message, after which a covertext is created to contain the encrypted message. This is called stegotext. For example, consider a
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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JPEG image, which is made up of groups of eight-bit bytes that ultimately encode the displayed image. Because JPEG is a compression technique, some quality of the original image is lost in the process, although with modern compression algorithms the loss is kept to an absolute minimum. Like all bytes, those found in a JPEG image have both a least significant bit and a most significant bit. In fact, changing the least significant bit from a one to a zero or vice versa results in no appreciable change to the output image. It makes sense, therefore, that someone could write a relatively simple routine to selectively encode the least signficant bit of each byte, collect all of the encoded bits, and group them into an embedded message. Make sense Naturally, the larger the image, the more data can be hidden within it. Consider, for example: A 24-bit bitmap that has eight bits representing each of the three primary colors (red, green, and blue RGB) for each pixel. The red color alone, represented by eight bits, has 256 possible values (28). The difference between a red value of 01111111 and a red value of 01111110 will be undetectable by the human eye. Therefore, the least significant bit can be used for something other than color information. If we then encode the green and the blue as well, we will have three encodable bits, which means that three pixels will yield nine bits, one more than is required to encode an eight-bit character. So why do we care about this In October 2001, the New York Times claimed that terrorists were using steganographic techniques to encode messages into images (by some acounts, pornographic messages at adult Web sites). While these claims were largely dismissed by security experts, it is certainly a possibility. Needless to say, security analysts have created steganalysis tools that can be used to detect and read messages embedded steganographically in images and other file types. From a more practical perspective, steganographic techniques can be used to embed important information such as digital watermarks, copyright information, and the like. Let s turn our attention now back to our e-mail message.
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