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The same technique can be used within your applications to handle cache files; periodic comparison of the hashes of cache files to the hashes of originals can be used to detect when originals have changed and need to be recached Of course, using a timestamp for this is simpler but not nearly as reliable, as a file may change more than once in the same second, and timestamps can be modified using touch An extra bonus for using this method is that the hash value of the cached file can be used as the HTTP ETag header (see section 1419 of RFC 2616 at http:// wwwietforg/rfc/rfc2616html for more information), which allows browsers to best utilize their internal caches and avoid repeated requests for the same, unchanged file.

<span class="arrow"></span> </a> </li> <li class="withimage"> <a class="noeffect" href="#"> <img alt="Sample" src="sample_image-1.jpg" /> <span class="name">List Item with Image</span> <span class="comment">Comment</span> <span class="arrow"></span> </a> </li> </ul> </div> </body>

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atches, often referred to as updates, offer more than just fixes to software. They help keep the software running on your desktop and server systems more secure. Of course, you already know that you should update your systems on a regular basis to make sure they are protected. But why should you apply patches using a complex tool such as SMS 2003 You could set up the Automatic Updating feature within your Windows systems and allow them to patch themselves automatically. Or you could use Windows Software Update Services (WSUS), which allows specific patches to be applied to groups of Windows systems. These tools may be adequate for smaller and simpler organizations, but SMS 2003 s services give you more control and accuracy in managing your Windows systems. SMS 2003 provides granular control of which patches are grouped together for distribution to systems. You can determine when updates will be distributed to systems, when they will be applied to systems, and which systems will receive the patches. By being able to control these parameters, you can provide your users a more secure Windows platform while minimizing usage interruptions. This chapter begins with an overview of the Microsoft Operations Framework methodology for managing enterprise changes. Then I will discuss the actual tools to perform those update and patch deployments, focusing on the SMS 2003 Inventory Tool for Microsoft Updates (ITMU). Finally, I ll suggest some techniques for more effective and efficient patch management.

Although typically even the tiniest change in a message creates a wildly different hash value, it is possible for collisions to occur, that is, for two entirely different messages to produce the same hash value It is therefore possible, albeit remotely possible, for an attacker to modify the content of a message in such a way that the same hash is produced Researchers have discovered techniques that decrease the difficulty of finding a collision for any given message, an example for MD5 can be found at http://eprintiacrorg/2004/199pdf As a practical matter, however, this technique can be considered reasonably secure for all applications except those requiring the highest levels of security..

Using digest algorithms alone is fine for closed systems, where you can without hesitation trust the hash value that you use to verify files. But when used to verify the contents of files sent by remote servers, the digest approach suffers from a fundamental flaw: you have no sure way of knowing that the hash value is itself valid. If an attacker is able to tamper with the contents of the files in a web directory, then he is likely able to tamper with a digest database on the same system. Hash values are trustworthy only if published widely and confirmed using more than one source. Digital signatures, on the other hand, are absolutely verifiable, at least to the extent that you trust that the sender is the only entity in possession of a particular public key. A signature takes the hash of the document, and then encrypts it using an asymmetric algorithm and the sender s private key. Anyone in possession of the sender s public key can decrypt the signature and verify that the hash matches the received document s hash. This is exactly what the sign() and verify() methods do in the openSSL.php class presented earlier in the chapter.

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