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What is most important is verifying that whatever the user has entered this time is the same as whatever we have already stored For that reason, a password is a candidate for protection by hashing, which is both simple to implement (in PHP, the functions md5() and sha1() will do it for you in one easy step) and so secure that not even the system administrator has access to a decrypted version of it Remember, however, that, precisely because it is so secure, a user who has forgotten her password can t get it back if it has been hashed Some might call this an advantage, but you need to balance the security against the frustration and annoyance that being forced to create a new password usually causes users There is one caveat to securing passwords in this manner.

Suppose that you d like to allow the user to rate the helpfulness of the question (and its answer). The latest rating is displayed at the end of the question, as shown in Figure 7 8. Again, you don t want to refresh the whole page, but just the question. This is just like clicking the <a4j:commandLink> to update the answer, except that now you need to process some user input (the rating).

LOBs let you store a large amount of data, including binary data, in tables. This is an alternative to saving data in files and then storing their URIs into the database. In some cases, you might find it useful to access the data as normal files outside the DBMS.

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If two users have the same password, then they will have the same password hash stored in your database This can put a user s privacy at risk by making an attacker s job much easier; he can with a greater likelihood of success use a precomputed table of common password hashes (created often from system dictionaries) to match against the stored passwords Following are two possible remedies: 1 You should establish and enforce (or more likely, encourage) password policies that make it much harder to look up the matching password in such a precomputed table that is, policies that require the table to be much larger than a normal dictionary in order to cover all possibilities Two factors determine the necessary size of a lookup table that contains every possible password: password length, and the diversity of characters used.

s Note A URI is a generalization of a URL. Strictly speaking, the name location of a code fragment (i.e.,

To do that, you can use an <a4j:commandButton> as shown in Figure 7 9. Simply put, an <a4j:commandButton> is just like an <a4j:commandLink> except that it will render itself as an HTML button instead of an HTML link.

Since there are 62 possible alphanumeric characters (not even counting any possible punctuation marks), an 8-character, completely random password could have 8^62 possible values That is a huge number indeed, far beyond the capacity of any lookup table..

the #whatever that you sometimes see in your browser s address field) is part of the URI but not of the URL, which only refers to the whole resource. Unfortunately, the definition of URI came when the term URL had already become universally known. That s why most people, including many specialists, keep referring to URLs when they should really be talking about URIs.

... <h:form> <a4j:commandLink action="#{faqService.trigger}" value="#{faqService.questionText} (#{faqService.rating})" reRender="p" id="q" /> This is just a normal HTML thing to This part is just a literal Literal expression put the form to the right. </h:form> expression that will be again. output as is. <h:form style="float:right"> <h:inputText size="2" value="#{faqService.rating}"></h:inputText> <a4j:commandButton value="Rate" action="#{faqService.rate}" reRender="q"> </a4j:commandButton> <commandButton> from the Ajax4Jsf tag lib. </h:form> It will put JavaScript into the onclick handler of <br /> the HTML submit button. <h:panelGroup id="p"> <h:outputText value="#{faqService.answerText}" id="a" rendered="#{faqService.showingAnswer}" /> </h:panelGroup> </body> </html>

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