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Get the count of waiting fish in the hopper Get the current cannon status including last firing time The actions that do something to change the state of the cannon (the first three) are all accessed via form submission (POST). The status commands (the last two) are simple URL retrievals (GET). Before we can engage in any fish-launching fun, we need to establish a connection to the web server on the cannon, which runs on port 5000. This particular device requires a username and password to operate but doesn t support HTTPS a malady that is as common as it is rebarbative. Also, a cookie will be returned that identifies our session to the server. This cookie needs to be used in all of our commands and so should be kept safe. Thinking a little more deeply, the session on the cannon is a specific example of a more abstract HTTP session. Therefore, to make things easier later on, let s start in Listing 8-7 by designing a WebSession class. Listing 8-7. An Abstract Class for Tracking HTTP Sessions require "cgi" require "net/http" class WebSession def initialize(url, port = 80) @session = Net::HTTP.new(host, port) @cookies = {} end def get(path) response = @session.get(path, retrieve_cookies(path)) collect_cookies(response) return response.body end def post(path, pairs) header = retrieve_cookies(path) header["content-type"] = "application/x-www-form-urlencoded" data = pairs.map { |k, v| "#{k}=#{CGI.escape(v.to_s)}") }.join("&") response = @session.post(path, data, header) collect_cookies(response) return response.body end private

public static byte[] SignDataBroker(byte[] data,RSAParameters privateRSA) { RSACryptoServiceProvider rsCrypto = new RSACryptoServiceProvider(); rsCrypto.ImportParameters(privateRSA); HashAlgorithm hashAlgo = new SHA1Managed(); byte[] hashedData = hashAlgo.ComputeHash(data); string shaOID = CryptoConfig.MapNameToOID("SHA1"); return rsCrypto.SignHash(hashedData,shaOID); } The actual message is first flattened into bytes, and then its hash value is computed. The hash value is then passed to SignHash, which encrypts it with a private key, and the final result, which is the digital signature of the contract note itself, is returned in a byte array. SignHash accepts additional mandatory arguments that represent hashing algorithm information. This information cannot be passed directly; instead, its corresponding object identifier (OID) is supplied, which is located with the help of the MapNameToOID static method of the CryptoConfig class. After signing the message, both the contract note information and the digital signature are delivered to recipients. In this case, the recipient is the fund manager and is mimicked by VerifySignFM: public static bool VerifySignFM(byte[] data,byte[] signedData, RSAParameters publicRSA) { RSACryptoServiceProvider rsCrypto = new RSACryptoServiceProvider(); rsCrypto.ImportParameters(publicRSA); HashAlgorithm hashAlgo = new SHA1Managed(); byte[] hashedData = hashAlgo.ComputeHash(data); string shaOID = CryptoConfig.MapNameToOID("SHA1"); return rsCrypto.VerifyHash(hashedData,shaOID,signedData); } The fund manager, upon receiving this message, immediately recomputes the hash value. The hash value is then verified with the digital signature by calling VerifyHash. During the verification process, the public key is used to decrypt the digital signature to obtain the original hash value. The original hash value is then compared with the newly computed hash value, and if both these hashes match, then it proves that the message indeed came from a legitimate source and that the integrity of information has not been compromised.

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appropriate calls to your Seam components, and the results are converted into XML and streamed back to the browser. On the server, you write Seam components in Java as usual, and on the client, you invoke those components using regular JavaScript calls. All the ugly details of the XML communications and the creation of JavaScript interfaces for the components are done for you by Seam s remoting services.

The first prerequisite before exchanging digital signature information is communicating the public key information. This exchange of a public key may happen through multiple sources, such as sending it through e-mail or downloading it from a public Web site. Multiple channels are available, but each of them gives rise to the problem of how a person is assured that the public key published belongs to the authentic party. A real-life example that addresses this concern is a passport issued to a citizen of a country. This passport forms the basis for individuals to prove their identities. Before issuing the passport to a person, a background check is conducted that includes the investigation of a criminal record. Such types of procedures are sufficient to create a level of trust. Because every country in the world honors passports, this provides a means to verify the identity of an individual. In the digital world, a similar document is required that acts like a digital passport, and this is where digital certificates are used. Digital certificates prove the identity of an individual or organization, and they form a strong basis of authentication. The primary purpose of a digital certificate is to encapsulate the public key information that is then used to verify the digital signature. But how is it different from transmitting public key information through e-mails or a Web download The first difference is that digital certificates are issued by a certificate authority (CA). A CA is an entity that establishes trust between two parties in a communication chain. The CA fills the needs for a trusted

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