Disappearing Cryptography: Information Hiding: Steganography by Peter Wayner

By Peter Wayner

Cryptology is the perform of hiding electronic info through a number of obfuscatory and steganographic suggestions. the appliance of acknowledged strategies allows message confidentiality and sender/receiver identification authentication, and is helping to make sure the integrity and protection of desktop passwords, ATM card details, electronic signatures, DVD and HDDVD content material, and digital trade. Cryptography is usually principal to electronic rights administration (DRM), a bunch of ideas for technologically controlling using copyrighted fabric that's being greatly carried out and deployed on the behest of companies that personal and create profit from the loads of millions of mini-transactions that ensue day-by-day on courses like iTunes.

This re-creation of our best-selling e-book on cryptography and knowledge hiding delineates a few diversified ways to disguise details in all kinds of electronic media records. those equipment contain encryption, compression, info embedding and watermarking, information mimicry, and scrambling. over the last five years, the continuing development and exponential bring up of computing device processing energy have superior the efficacy and scope of digital espionage and content material appropriation. for that reason, this version has amended and increased outmoded sections in response to new hazards, and comprises five thoroughly new chapters that introduce more recent extra refined and subtle cryptographic algorithms and methods (such as fingerprinting, synchronization, and quantization) in a position to withstanding the advanced sorts of attack.

Each bankruptcy is split into sections, first delivering an creation and high-level precis in the event you desire to comprehend the recommendations with out wading via technical reasons, after which providing concrete examples and larger element when you are looking to write their very own courses. this mix of practicality and concept permits programmers and procedure designers not to merely enforce attempted and real encryption techniques, but in addition give some thought to possible destiny advancements of their designs, therefore pleasing the necessity for preemptive warning that's changing into ever extra specific 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 details opposed to even the main advanced digital attacks
  • Conceptual tutelage along side distinctive mathematical directives permits the reader not to merely comprehend encryption approaches, but in addition to put in writing courses which expect destiny defense advancements of their design

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

Sample text

P(~,~ is the first parity bit. There are five data bits and one parity bit in this example. The parity bit could be a n y function of the bits in the previous subblocks. For simplicity, let P(i, 1) = b(i,l) + b(i-l,2) + b(i-2,3) + b(i-3,4) + b(i-4,5)mod 2. That is, each parity bit is affected by one of the bits in the previous five subblocks. These parity bits can detect one burst of up to five bits that occurs in each rolling set of five subblocks. That m e a n s the error will be detected if every two error bursts have at least five subblocks between t h e m .

A brute-force attack is possible, but this requires a large m a c h i n e and some insight into the structure of the e n c r y p t e d file. So, we could argue t h a t the results of DES or AES s h o u l d appear r a n d o m because we can't predict t h e m successfully [Way92, Fou98]. The same a r g u m e n t s also hold for RSA. If there were some black box t h a t could take a n u m b e r a n d tell you where it stood in the loop, t h e n y o u w o u l d be able to break RSA. If the i n p u t d i d n ' t fall in a pattern, t h e n the o u t p u t would be very r a n d o m .

These a l g o r i t h m s are designed a n d evaluated solely on their ability to resist attack. DES is still relatively secure, a l t h o u g h brute-force attacks on the relatively small 56-bit key are very feasible. 9 H o w To Use It? E n c r y p t i o n code can be d o w n l o a d e d from a n u m b e r of places on the Net. See A p p e n d i x D. c h a p t e r three Error C orrection Close b u t No Cigar 1. Speedwalking 2. America Online, CompuServe, and Prodigy 3. Veggie burgers 4. Using a StairMaster 5.

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