Practical Cryptology and Web Security by P. K. Yuen

By P. K. Yuen

The move of data over the realm broad net relies significantly on safe communications. the necessity to safeguard the fabric we ship and obtain from our on-line world, from the biggest of commercial transactions to the easiest of private web-pages, is important in making sure we will be able to proceed to take advantage of this amazing source adequately. Cryptology offers the main trustworthy instruments for storing or transmitting electronic info and is the most beneficial for reaching the degrees of safety our on-line interactions call for.

Taking a step by step method P. ok. Yuen demonstrates tips to grasp functional encryption/decryption algorithms, implementation options, and web-based safety abilities including:

· keeping web pages from hackers and viruses;

· Encrypting e-mail, websites, and quick messages;

· development a safe web-database;

· appearing safe company transactions over the web.

Working from a problem-solving viewpoint, he indicates find out how to enforce protection recommendations and appears from the attacker’s viewpoint at attainable demanding situations to that safeguard. in brief, useful Cryptology and net safety deals a realistic and complete consultant to all features of internet security.

Over one hundred twenty labored examples, many from undefined, show the foremost concerns in enforcing internet security.
Covers the entire significant encryption ideas and criteria, together with the AES.
Examines the newest internet applied sciences when it comes to safeguard, together with XML Signatures and XML electronic Contracts
PK Yuen is a well-known professional on Communications, web and the area huge internet. He has over thirteen years’ event engaged on net applied sciences together with huge scale program advancements, engineer education, venture management and dealing at the safeguard structures of overseas airports. he's co-author of useful internet applied sciences, additionally released by way of Addison-Wesley.

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Example text

If a = 0100 0101 → a << 2 = 0001 0100 >> Sign propagating right shift Shifts the bits of the first operand right by the number of bits specifies by the second operand. g. if a = 0100 0101 → a >> 2 = 0001 0001 >>> Zero right shift Similar to >> but bits shifted off to the right are discarded and zeros are added on to the left. & Bitwise AND The resultant bits are set to 1 only when both corresponding bits in the two operands are 1. Otherwise bits are set to 0. g. a =0100 0101, b = 0101 0110 → | Bitwise OR The resultant bits are set to 1 when either one of corresponding bits in the two operands is 1.

In addition to the bitwise operations, this example also shows how to use radio buttons on Web pages. In fact, for security on the Web, page design, programming and security algorithms are equally important. Now, let’s see how to use bitwise operations to develop a well-known encoding. Fig. qxd 08/17/2005 08:51 AM Page 46 Fig. 3 Bitwise operator II Base64 encoding and decoding Computers are designed to handle binary data efficiently. Binary data is typically stored in bytes of 8 bits. Under the standard ASCII code, one character occupies one byte (8 bits) although only 7 bits are used.

This unicode value is added into the strings sstring2, sstring16 and sstring10. After the for-loop, all three numerical representations of the message sstr are obtained. 15. Now, we have everything ready to implement one of our very first message encryption schemes – the Caesar code. Fig. 5 Implementation of the Caesar code As we have mentioned earlier, messages from the emperor of ancient Rome were sometimes shifted by 3 from the character table to maintain security and secrecy. This coding method is known as the Caesar code.

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Practical Cryptology and Web Security by P. K. Yuen
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