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Application Database Cipher to Use Block Comments Interoperability with other software is not an issue, but you will need to reuse keys. Although each e-mail message has its own key and you could use a stream cipher, you gain interoperability with all e-mail packages by using the standard AES. Speed is extremely important, each connection can have a new key, and virtually all Web browsers and servers possess RC4. Interoperability is not an issue, but you can encrypt each file with the same key and then protect that key (see 3).
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A computer can be programmed to perform any encryption algorithm. By the 1970s, though, it was known that the old algorithms were not very strong. They had weaknesses and were difficult to implement. The advent of computers made it possible to throw out the old rules of cryptography and create a new paradigm. Researchers at IBM decided to develop a new algorithm for the computer age, and built on a scheme called Lucifer, an algorithm invented by cryptographer Horst Feistel. They also enlisted the help of the National Security Agency (NSA), the agency charged with protecting the U.S. government s secret data, a duty that includes cryptography. The fruit of the group s labor was DES. DES is a block cipher that uses a 56-bit key no more, no less to build a key table. Using the key table, DES performs bit manipulations on plaintext. To decrypt ciphertext, it simply does everything in reverse.
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After its introduction, DES became freely available and widely studied. Throughout the 1980s, the consensus among cryptographers was that it had no weaknesses. This meant that the fastest way to break a message encrypted with DES was to use the brute-force attack. Because a 56-bit key is a number between 0 and about 72 quadrillion, even the fastest computers took years to break a single message. By the 1990s, though, cryptographers knew that DES couldn t last. Computers were becoming faster and eventually would be fast enough to mount a brute-force attack on a 56-bit key in a reasonable amount of time. In addition, researchers discovered potential weaknesses that led them to conclude that someday it might be possible to break the algorithm. The brute-force attack was still the fastest attack, but those potential weaknesses were troubling. In 1999, at the RSA Conference, the Electronic Frontier Foundation broke a DES key in less than 24 hours. The world needed a replacement.
Triple DES
One widely used replacement for DES is Triple DES. The name says it all: Triple DES performs the DES algorithm three times. That s it. You run your block of data through DES using a key, and then you encrypt that result with another DES key. Then you do it a third time (see Figure 2-15). You use three keys, each 56 bits. That s essentially the same as using one 168-bit key. You may be thinking, If it takes 24 hours to break one key, then shouldn t it take 72 hours to break three keys Here s the answer. It takes 24 hours to break one key if you know you ve broken it. But with Triple DES, you don t know you ve stumbled onto the first key until you combine it with the other two correct keys. Think of it this way. Suppose that the three keys are called A, B, and C, and each possible key value is numbered from 0 to 72 quadrillion. Suppose also that the correct key combination is A 1, B 33,717, and C 1,419,222. An attacker could try value 0 with key A, value 0 with key B, and value 0 with key C. That doesn t produce the correct answer, so try A 1, B 0, C 0. As shown in Figure 2-16, the first key is correct. But the value the attacker got from trying the three-key combination is not the right value. The correct plaintext appears only when all three keys are correct. So how can the attacker know that the first key is correct
Figure 2-15
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