Disappearing Cryptography: Information Hiding: Steganography by Peter Wayner

By Peter Wayner

Cryptology is the perform of hiding electronic info via a number of obfuscatory and steganographic ideas. the applying of acknowledged suggestions enables message confidentiality and sender/receiver identification authentication, and is helping to make sure the integrity and safeguard of laptop passwords, ATM card info, electronic signatures, DVD and HDDVD content material, and digital trade. Cryptography can be crucial to electronic rights administration (DRM), a bunch of strategies for technologically controlling using copyrighted fabric that's being generally applied and deployed on the behest of organisations that personal and create profit from the masses of millions of mini-transactions that occur day-by-day on courses like iTunes.

This new version of our best-selling ebook on cryptography and knowledge hiding delineates a couple of diverse how you can disguise details in all kinds of electronic media records. those tools contain encryption, compression, information embedding and watermarking, facts mimicry, and scrambling. over the past five years, the continuing development and exponential bring up of computing device processing strength have stronger the efficacy and scope of digital espionage and content material appropriation. as a result, this variation has amended and accelerated outmoded sections in line with new risks, and comprises five thoroughly new chapters that introduce more moderen extra subtle and subtle cryptographic algorithms and methods (such as fingerprinting, synchronization, and quantization) in a position to withstanding the advanced kinds of attack.

Each bankruptcy is split into sections, first offering an advent and high-level precis if you desire to comprehend the ideas with no wading via technical causes, after which providing concrete examples and bigger aspect when you are looking to write their very own courses. this mix of practicality and concept permits programmers and method designers not to simply enforce attempted and precise encryption techniques, but in addition think of possible destiny advancements of their designs, therefore enjoyable the necessity for preemptive warning that's turning into ever extra particular because the transference of electronic media escalates.

  • Includes five thoroughly new chapters that delineate the most up-tp-date and complicated cryptographic algorithms, permitting readers to guard their info opposed to even the main advanced digital attacks
  • Conceptual tutelage at the side of exact mathematical directives permits the reader not to in simple terms comprehend encryption systems, but in addition to write down courses which count on destiny safeguard advancements of their design

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Extra info for Disappearing Cryptography: Information Hiding: Steganography and Watermarking (The Morgan Kaufmann Series in Software Engineering and Programming)

Example text

It would not be possible, for instance, for someone to use their WWW browser to encrypt the credit card numbers being sent to a merchant without exchanging a onetime pad in person. Often, the sheer bulk of the pad makes it too large to be practical. Many people have tried to make this process more efficient by using the same part of the pad over and over again. If they were encrypting a long message, they might use the key 90210 over and over again. This makes the key small enough to be easily remembered, but it introduces dangerous repetition.

One of the first plans for MegaGoth/Pinnacle Paints is to take the standard white paint and rebottle it in new and different product lines to target different demographic groups. Here are some of Megagoth’s plans: Moron and Moosehead’s Creative Juice What would the two lovable animated characters paint if they were forced to expand their 19 20 CHAPTER 2. ENCRYPTION creativity in art class? Moron might choose a white cow giving milk in the Arctic for his subject. Moosehead would probably try to paint a little lost snowflake in a cloud buffeted by the wind and unable to find its way to its final destination: Earth.

If the counting goes past “Z” at the end of the alphabet, simply go back to “A” and keep going. The letter “Y” encrypted with the key number 6 would produce “E”. To decrypt work backward. Here is a sample encryption: H 9 E 0 L 2 L 1 O 0 Q E N M O In this case, the key is the five numbers 9, 0, 2, 1, and 0. They would constitute the one-time pad that encrypted this message. In practice, the values should be as random as possible. 1 Shannon proved that a one-time pad is an unbreakable cipher because the information in the final file is equal to the information in the key.

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