Protection of Privacy in Software

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CRYPTOGRAPHY
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An alternate protection technique is provided by transformation of data into a form that does not provide information when intercepted Such methods can provide privacy in otherwise insecure environments and can provide e ective secrecy in conjunction with the methods which were discussed previously Three basic techniques are available: 1 Encoding of information 2 Transposition of codes representing data 3 Substitution of codes representing data The encoding of data is a common process even without privacy consideration Letting the value 1 mean male and the value 2 stand for female is a form of encoding, which will protect that eld to someone who does not have access to a code book or schema We will discuss methods of encoding in detail in Chap 14 Operations where basic symbols are transposed or substituted in order to garble the data are referred to as enciphering Such a transformation creates cipher text from plain text In order to understand the message, the recipient will have to decipher the cipher text, according to rules and a key used in the enciphering operation The intruder, who wishes to understand the text, will have to resort to decrypting techniques Figure 12-6 shows the components of cryptography
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We will consider mainly operations on data consisting of alphabetic messages It should be noted that in elds outside of cryptography, the term code is commonly used for processes regarded as a cipher within the eld Only in this section will we be careful and make the appropriate distinction The e ectiveness of cryptography depends on the plain text to be enciphered Natural-language text has very distinctive patterns, and also provides much redundancy which promotes both comprehensibility of garbled text in day-to-day use, and the decrypting of enciphered data by analytical methods We rst will present the two basic enciphering methods and then discuss the security which they provide 12-7-1 Ciphering A transposition cipher operates on a group of characters A key indicates the rearrangement pattern, as shown in Fig 12-7 If the block length is N there are N ! possible rearrangement patterns
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Some of the N ! enciphering-key combinations will be undesirable, since they leave parts of the message in the same sequence as the plain text, but many acceptable alternatives remain, especially when N is large The example shows that the use of infrequent uppercase letters exposes a critical part of the message A large key presents a problem in itself, since it can be di cult to transmit the key required for deciphering to the intended recipient In order to obtain a larger e ective N and yet operate on shorter messages, individual bits or small bit sequences may be scrambled through transposition Figure 12-8 gives an example using a short message in the ASCII character encoding Figure 14-1 provides the bit-pattern table to be used In the example the transposition key used is very short (N = 5) and repeatedly used
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A substitution cipher provides replacement of characters of the source message by one or more characters of a cipher alphabet A constant substitution cipher provides an alternate unique character for every character of the source alphabet The number of alternatives here is again N The cipher can be described by a substitution table, or alternatively by the number of positions in the alphabet between the source and cipher character The substitution must be chosen so that it is reversible; ie, two di erent characters from the plain text should not map to the same cipher text character A very simple constant substitution cipher is the Caesar cipher The substitution is de ned by a displacement of a xed number of positions, and hence o ers only 27 choices for a compact alphabet, of which the 0 displacement is of course unsuitable The choice of 1 has achieved fame in Arthur Clarke s movie script for 2001 by its use in naming the HAL computer
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