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Rather than simply supplying a selection of random letters for the Captcha, I decided it s much more natural to enter an English word, and so this plug-in requires a file called dictionarytxt to be in the same directory This file should be a list of words with one per line and each line separated by a \r\n carriage return\linefeed pair On the companion web site to this book at wwwpluginphpcom there s an 80,000-word dictionarytxt file already saved in the same zip file as this plug-in Or you can choose to use your own list of words Either way, the first thing the function does is load the contents of dictionarytxt into the variable $temps from where all the words with a length of the value in $length are extracted into the array $dict using a foreach loop, and the Captcha word is then selected from this subset of words Next a token is created with which the Captcha can be uniquely connected This is done by calling the PHP md5() function, which is a one-way function that converts the input into a 32-character string in such a way that the algorithm cannot be reversed This is why it s called a one-way function However, instead of simply taking the dictionary word and creating an md5() hash of it, it s necessary to obfuscate things a little This is because some people have spent a lot of time assembling dictionaries containing the hashes of every single word Therefore, for example, the md5() hash of the word hello is easily looked up and is known to be the following:

At this point, you have a signature on the screen and need to capture it. A new FileOutputStream B is obtained for a file on the local filesystem, and the signature is written to this file. You re now ready to transmit this file to the server remember, you want to bill the client as soon as possible for work completed! In preparation for sending the signature to the server, the signature file contents are read into a byte array via an instance of a FileInputStream. Using the Prefs instance to get specific configuration information, a URL c is constructed in order to POST data to the server. The query String of the URL contains the jobid and the POST data contains the image itself. A BufferedOutputStream d is employed to POST data, which consists of the captured signature in JPEG format. Once the job data and signature have been sent to the server, the response data is read back from the server e. A specific string indicates a successful transmission f. Upon successful closing, the JobEntry status member is marked as CLOSED g, and this JobEntry is converted to a Bundle so that it may be communicated to the caller by invoking the setResult() method h. Once the Handler receives the I m done message and the Activity finishes, this data is propagated back to the ShowJob and all the way back to the ManageJob Activity. And that thankfully wraps up the source code review for the Android side of things! There were some methods omitted from this text to limit this already very long chapter, so please be sure to examine the full source code. Now it s time to look at the server application. jobs

A mobile application often relies on server-side resources, and our field service application is no exception. This isn t a book on server-side development techniques, serverrelated code, and discussion, so we ll present these things briefly. We ll introduce the

Wherever this particular hash is encountered, the chances are very high indeed that it was created from the string hello , and so it would be a cinch to crack this Captcha system So, like I said, it s necessary to be a little sneaky by making it impossible for a dictionary crack to work

simple as possible, we re going to break a rule, so this is going to be fun I have mentioned more than once that whenever you declare a word variable, you should avoid using either of the associated two byte variables in the same program For example, if your program uses the w0 variable, you should not also use b0 or b1 because it can result in erratic program behavior However, in this case, breaking that rule actually simplifies our program Take a look at the variable declarations in the MAXhelpbas program shown in Listing 12-2, and then I ll explain what I mean As you can see, outByte (the eight-bit data byte to be sent to the display) is declared as variable b0 and maxReg (the 7219 register that is going to receive outByte) is declared as variable b1 However, the very next statement declares forMax as the w0 variable Before you send for the programming police, let me explain That combination of variable declarations makes forMax

then we ll review the two server-side transactions that concern the Android application. The server code relies on open source staples: MySQL and PHP. Let s get started with the interface used to enter new jobs, used by the dispatcher.