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The individual symmetric algorithm is encapsulated in a separate class, and being inherited from a common base class, it is relatively simple to change the algorithm implementation with the flip of a switch. However, some exception cases exist where a particular feature is available in one algorithm and not in others. The key differentiator among these algorithms is the key size supported and how fast a message is encrypted or decrypted. Table 6-1 provides this information.

<h:dataTable rendered="#{identity.loggedIn and not empty taskInstanceList}" value="#{taskInstanceList}" var="task"> <h:column> <f:facet name="header">Description</f:facet> <h:outputText value="#{task.description}"/> </h:column> <h:column> <s:link action="#{gadgetReview.startReviewTask}" value="Begin" taskInstance="#{task}"/> </h:column> </h:dataTable>

Armed with just the libraries discussed so far, it is possible to create a number of eminently useful tools Consider a database-driven DNS system that, for certain A records, carries the notion of a backup IP address Thus when the zone maintenance script runs, it not only checks that all the A records are current, but also checks that, for those with backups defined, the primary IP address is contactable in some way For such a system, we need to build a connectivity checker something we can think of as a kind of ping (in a very generic sense) In this case, it will check that it can make a TCP connection to a particular port on a given IP address Listing 8-4 shows some code to add this method to the TCPSocket class Listing 8-4 TCP Connectivity Checker require "timeout" class TCPSocket def self.

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56 bits Three different keys of 56-bit key size to encrypt and decrypt a message Variable key size (1 to 2,048 bits) Supports 128-, 192-, and 256-bit key size only

The next step is to delve into the code-level implementation where a plain message is encrypted and decrypted using the Rijndael algorithm. Let s consider the interaction between the broker and fund manager where the contract note defined using XML is encrypted into an unreadable content and sent to the fund manager. The fund manager on receiving this encrypted information will be able to decipher the message only if he knows the symmetric key. The code shown in Listing 6-1 demonstrates both these scenarios. The code is broken down into two sections; the first section provides information about underlying cipher strength, and the last section covers the encryption and decryption task. Listing 6-1. Contract Note Information Encrypted by the Broker and Decrypted by the Fund Manager Using the Symmetric Key using using using using System; System.Text; System.IO; System.Security.Cryptography;

Except for the fact that we re using the taskInstanceList instead of the pooled TaskInstanceList, there s very little different between this table and the one you saw earlier. One difference is that, since we re placing this table on the main home page, and since that page does not require authentication, we need to check to see whether the user is logged in before we render the table. If a user is not authenticated, checking his or her taskInstanceList isn t possible, because we don t know who that user is. The other difference in the links is that, instead of using the pooledTask component to assign tasks to users, we re pointing the links to an action method, startReviewTask(), on our gadgetReview component. This task is annotated with an @StartTask annotation, so when the user follows this link, a new conversation will be started, and the task whose taskId is passed in the request will be started in the corresponding business process instance:

can_connect (ip, port, wait_secs = 5) Timeout::timeout(wait_secs) { open(ip, port) } return true rescue return false end end Note first how we re able to treat the function definition itself as an implicit begin-end so we only have to mention the rescue keyword We perform our now familiar TCPSocketopen (implicitly) inside a timeout block, the duration of which can be overridden but defaults to five seconds Quite simply, then, if any connection error occurs or the timeout is triggered, the method returns false Otherwise, it returns true Continuing our DNS example, we can imagine that some DNSRecord class might have a value method for deriving the dynamic value of a web server s A record based on the can_connect functionality.

namespace SymmetricAlgo { class SymmetricExample { static void Main(string[] args) { //perform symmetric encryption using RijndaelManaged algorithm SymmetricAlgorithm algoProvider = RijndaelManaged.Create(); Console.WriteLine("Crypto Provider Information"); Console.WriteLine("--------------------"); Console.WriteLine("Cipher Mode : " + algoProvider.Mode); Console.WriteLine("Padding Mode : " +algoProvider.Padding); Console.WriteLine("Block Size : " +algoProvider.BlockSize); Console.WriteLine("Key Size : " +algoProvider.KeySize); Console.WriteLine("Contract Note Encryption Stage - Broker end"); Console.WriteLine("-------------------------------------------"); //Generate Symmetric Key algoProvider.GenerateKey(); //Generate IV algoProvider.GenerateIV(); //create file that stores encrypted content of contract note FileStream fileStream = new FileStream(@"C:\ContractNote.enc",FileMode.Create);

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