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Encryption of the XML payload when carried over HTTP can be accomplished using SSL, but sometimes that's not enough When carrying XML over other transports, potentially over multiple transports, or when storing XML documents in a file or in a database, it is helpful or even necessary to have a specific mechanism for encrypting the XML documents When encrypting an XML element or element content, the EncryptedData element defined in the XML Encryption specification replaces the element or content (respectively) in the encrypted version of the XML document As with many things related to XML, encryption works at any level of nesting Either the entire document (except the encryption headers) or any element within it can be encrypted Selective encryption is useful when only part of a document needs to be kept private It's possible to encrypt the tags as well as the data so that no one can see what the data is supposed to contain, such as hiding a <creditcard> tag within a <CipherData> tag For example:
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< xml version='10' > <PaymentInfo xmlns='http://wwwionacom/artix/paymentService'> <Name>Eric Newcomer</Name> <CreditCard Limit='50,000' Currency='USD'> <Number>5555 5555 5555 5555</Number> <Issuer>Example Bank</Issuer> <Expiration>04/02</Expiration> </CreditCard> </PaymentInfo> < xml version='10' > <PaymentInfo xmlns='http://wwwionacom/artix//paymentService'> <Name>Eric Newcomer</Name> <EncryptedData Type='http://wwww3org/2001/04/xmlenc#Element' xmlns='http://wwww3org/2001/04/xmlenc#'> <CipherData>
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Summary
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Security is a complex field awash in technologies and protocols to meet an ever-growing series of threats to data and programs Protecting data against unwanted access typically involves encrypting Web services messages, and a variety of options exist for doing so It's important when selecting an option to determine compatibility with the services you're interacting with, and to ensure that the overall SOA supports a consistent technology, or set of technologies Often, more than one encryption technology is needed to handle the variety of services arriving from a variety of sources in an SOA, and mechanisms are available for this purpose Protecting against unwanted access to programs and IT resources involves using potentially strong authentication techniques combined with authorization checks to restrict access to only those who need it Again, a variety of technologies exist for authentication, and picking the right one or set is important for the smooth and efficient functioning of an SOA When exposing services externally, it may be necessary to support a choice of authentication mechanisms for different consumers Whenever decisions are made concerning the selection of the most appropriate security technology, it's important to codify and formalize them in policies A good security solution starts with a well-reasoned and thoroughly researched statement of policy Web services provide mechanisms for expressing those policies in machine-readable form, but it's important to thoroughly document the overall security policy and the threats it's designed to guard against With security, it's easy to think that you never have enough, but striking the right balance is important because each security technology comes with a built-in performance penalty The stronger the encryption, the more processing power it takes to encrypt and decrypt, for example Use only as much security as you really need
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9 Advanced Messaging
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This chapter describes advanced messaging features, including reliable messaging and extended message exchange patterns for event notification and publish/subscribe This chapter also covers advanced messaging techniques for mobile workers who operate under "occasionally connected" computing scenarios
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Reliable Messaging
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One of the biggest obstacles to the adoption of Web services for some types of mission-critical applications is the use of unreliable network transports, such as HTTP, and the lack of reliable message delivery By adopting a reliable messaging specification for Web services and adding reliability headers into SOAP messages, Web services can be used for a broader range of applications, and application development can be simplified Reliability for Web services is usually discussed with respect to messaging because HTTP is not a reliable communications transport in the way that more traditional middleware transports (such as WebSphere MQ and JMS) and B2B protocols (such as RosettaNet and EDI) are reliable When Web services are used to replace or supplement traditional middleware, EAI, and B2B applications, a more reliable transport is typically among the application requirements Reliability for Web services is defined independently of the transport as a series of SOAP messages exchanged within a group or sequence and some processing rules governing the use of acknowledgments and message numbers to ensure that all the messages are received, that (optionally) duplicates are eliminated, and that (optionally) message ordering is preserved Of course, overall application reliability requires more than reliable messaging and messaging is only one part of a comprehensive solution Security, transactions, and execution environments, such as clustering and redundant storage, may also have a role to play
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