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return questionText; } public String getAnswerText() { return answerText; } public String trigger() { isShowingAnswer = !isShowingAnswer; return null; } public boolean isShowingAnswer() { return isShowingAnswer; } }

Figure 15 2. Wikipedia s illustration of the pattern flaw in ECB mode encryption. This image is licensed under the GNU Free Documentation License at http://www.gnu.org/copyleft/fdl.html It is from the Wikipedia article Block Cipher Modes of Operation at http://en.wikipedia.org/wiki /Block_cipher_modes_of_operation. Because of this pattern flaw, ECB mode is best suited to the encryption of random data, where patterns in the encrypted text, if they exist at all, will give away very little information about the plaintext. The other three modes we will discuss address this issue of patterns by using data from previous blocks to obscure the data in the current block. In other words, the successful decryption of each block depends on the decryption of some or all of the blocks before it.

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OFB, or Output Feedback mode, maintains a series of data blocks, called a keystream. Each block of the keystream is encrypted using the secret key to form the next block. Once the keystream is generated, it is XORed with the plaintext blocks to form the ciphertext. Because the keystream is generated independently of the text, this mode is extremely resistant to transmission errors; if one of the blocks has bad bits, it doesn t affect decryption of the other blocks. OFB mode doesn t leak any information about patterns in the plaintext or in duplicate blocks, but because it is error-resistant, it is also subject to undetectable manipulation of the message via manipulation of the ciphertext.

When you run the application, clicking the question should show and hide the answer. Of course, now the whole page is refreshed because Ajax is not used.

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or Cipher Feedback mode, also uses a keystream. Rather than generating it independently, however, each successive keystream block is generated by encrypting the previous ciphertext block. The result is then XORed with the current plaintext block to produce the ciphertext. This has the advantage of preventing the manipulation of the encrypted text in transit, because each block of ciphertext acts as the key for the next block. But because of the way this feedback mechanism works, CFB may leak information about adjacent blocks that happen to be identical.

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Now, you d like to use Ajax to hide or show the answer, without refreshing the whole page. A first attempt is shown in Listing 7 7. Listing 7 7. Trying to Use Ajax to Change the Visibility of a Component

Finally, CBC, or Cipher Block Chaining mode, XORs each plaintext block against the preceding ciphertext block, and then encrypts the result. This is considered the most secure mode as any patterns in the plaintext are obscured before the plaintext blocks are encrypted, and any change to a ciphertext block will render the blocks after it undecryptable. For most applications you will probably want to use CBC mode.

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<!DOCTYPE ...> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:a4j="http://richfaces.org/a4j"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Insert title here</title> </head> <body> <h:form> <a4j:commandLink action="#{faqService.trigger}" value="#{faqService.questionText}" reRender="a" /> </h:form> <br />

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