vb.net barcode scanner webcam Triple DES is simply DES run on the data three times in Software

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Triple DES is simply DES run on the data three times
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Triple DES, however, presents two problems. First, cryptanalysts have figured out a way to streamline the brute-force attack. You d think it would require a 168-bit brute-force attack, but there are clever ways to reduce it to the equivalent of a 108-bit brute-force attack. A key that is equivalent to 108 bits is still secure (see Table 2-1 for worst-case estimates of a 108-bit brute-force attack), but this weakness is troubling. Will more research expose more cryptanalytic weaknesses Will the security of Triple DES be compromised even further The second problem is speed. DES takes a long time to encrypt or decrypt data, and Triple DES is three times as slow. Some applications need high-speed throughput of many megabytes worth of information. Triple DES reduces the performance so much that some applications cannot function. For these two reasons, people needed a new algorithm.
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Figure 2-16 To break Triple DES, you must know all three keys
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In response to the key size and performance problems of Triple DES, many cryptographers and commercial companies developed new block ciphers. The most popular offerings were RC2 and RC5 from RSA Data Security, IDEA from Ascom, Cast from Entrust, Safer from Cylink, and Blowfish from Counterpane Systems. All these algorithms were faster than Triple DES, and they were able to operate with variable-sized and bigger keys. Whereas DES and Triple DES keys require fixed-length keys, the new algorithms could be made stronger. Recall that you can choose a key size that is big enough to make your cryptographic system immune to the brute-force attack or at least to make the brute-force attack unfeasible. At one time, a 56-bit key was big enough. But when that was no longer secure enough, 64 bits was
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a popular key size. Even though DES cannot increase its key size, the commercial replacements can. The various commercial DES replacements caught on to some degree, and companies built products using the algorithms. But none became a worldwide standard comparable to DES and Triple DES. In response, the U.S. government, through the National Institute of Standards and Technology (NIST), set about creating a new standard. The idea was to name a particular algorithm as the U.S. government standard. Once the U.S. government adopted a standard, the thinking went, the rest of the world would almost certainly follow.
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Advanced Encryption Standard
The NIST plan was formally announced on January 2, 1997, when the agency invited anyone to submit an algorithm as the new standard, to be known as AES. As a condition for entry into the AES process, developers promised to give up any intellectual property rights to the selected algorithm. Many individuals and companies responded, and on August 20, 1998, NIST named 15 candidates. The next step was for the world to analyze the algorithms. The criteria were security (no algorithmic weaknesses), performance (it had to be fast on many platforms), and size (it couldn t take up much space or use much memory). Many of the original 15 algorithms did not last long. Weaknesses were discovered, and some were shown to be simply too big or too slow. In August 1999, NIST trimmed the list to five candidates. For the next year, researchers, cryptanalysts, and vendors of computer hardware and software tested the algorithms to decide which they liked best. Many papers were published, and volumes of statistics were released comparing the finalists. Each had its strengths and weaknesses. Finally, on October 2, 2000, NIST announced the winner: an algorithm called Rijndael (commonly pronounced Rhine-doll ) invented by two Belgian researchers: Vincent Rijmen and Joan Daemen. From now on, the AES algorithm is free for anyone to develop, use, or sell. As with DES, it is expected that AES will become a worldwide standard. You can expect that within a short time, if someone has cryptography, he or she has AES.
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