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Without any other context, the word etdxn doesn t seem to mean anything, and any would-be attackers are left frustrated. Even if they know how the cipher works, without the extra information supplied by the key, they will be stuck. What happens if someone figured out your key, though When this happens, the cipher becomes useless, and attackers will be able to decrypt any ciphertext that they come across later. It is imperative to keep your keys secret. Some modern systems generate keys on the fly based on secret processes, such as the time of day or the motion of a lava lamp. Apart from the keys, modern ciphers are, of course, far more complex than

The following is the output of our test client in Listing 9-15: Comments for post: Change Tracking Proxies Comment: I use ICollection<T> all the time

After the initialization information is displayed, you will see live packet capture information on the Terminal screen if you are connected to a network. Now kill the snort foreground process by pressing Ctrl+C to take a look at the summary information. You should be ready to roll if you see packet captures that resemble Figure 14-3.

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the example shown above, and often involve scrambling the order of letters in addition to performing various permutations on each byte of data. There are many types of ciphers available for use in software applications. Most fall into one of two major categories. A block-based cipher encrypts data in certain chunk sizes. In our previous example, since our key is 5 letters long, we would want to process plaintext in sets of 5 letters. If the incoming plaintext has only 13 letters, then we can substitute random characters for the last 2 letters and discard them when we decode the message. Alternately, a stream-based cipher can process plaintexts of arbitrary length. Neither type is inherently more secure than the other.

Let s start with the Windows console application, which is our test client for the service We create an instance of our service client in a using {} block Just as we ve done with the creating an instance of an object context in a using {} block, this ensures that Dispose() is called when we leave the block either normally or via an exception Once we have an instance of our service client, the first thing we do is call the Cleanup() method We do this to remove any previous test data we might have With the next couple of lines, we call the service s SubmitPost() method In this method s implementation (see Listing 9-14), we Attach() the post and then check whether the PostId is 0 If the PostId is 0, then we assume it s a new post.

NOTE: For official snort training, see www.sourcefire.com/services/education/.

If a server sends your app encrypted data, you will need to write code to decrypt that data so you can process it. Similarly, if you encrypt your user s data and store it on the local filesystem, you ll decrypt that data when you need to access it. Decryption is the reverse of encryption, and transforms a ciphertext back into a plaintext, as shown in Figure 5-1.

Admittedly, this is a rather crude way of determining whether the post is new It depends on the domain of the valid Ids for a post as well as the runtime initializing integers to 0 A better approach might involve sending an additional parameter to the method or creating a separate InsertPost() method The best approach is dependent on the structure of your application If the post is to be inserted, we change the object state of the post to EntityStateAdded Otherwise, we change its object state to EntityStateModified These mark the object as new; an insert statement should be generated, or if modified, an update statement should be generated If the post is inserted, the post instance s PostId is updated with the new correct value The post is returned Inserting and updating a comment is similar to inserting and updating a post with one significant difference.

NOTE: snort has no mechanism to update rules automatically. To keep snort updated, you should add a script to your weekly or monthly periodic tasks that will download the current rules.

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