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Security is one of the most important and most complex issues confronting the Internet and Web services Security is something you can't have enough of, but you have to draw a line somewhere, or you would never get anything done Security is fundamental
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Basic security issues include data confidentiality and integrity to ensure that no one steals your credit card number, for example, or tampers with the content of your message and authentication/authorization, which deals with the rights of individuals or groups to access a certain resource, such as a given Web service interface For confidentiality and integrity, the starting point is SSL/TLS,[2] which is implemented as HTTP over SSL (HTTPS) For authentication/authorization, the starting point is the simple checking of username/password, common to many Web sites, and proprietary mechanisms developed by such security vendors as Netegrity and Entrust Another critical and fundamental aspect of Internet security is the use of firewalls, which have a bearing on Web services because they can be configured to inspect messages
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[2] The leading encryption technology, known as Secure Sockets Layer (SSL v2/v3) see http://wwwnetscapecom/eng/ssl3/ is based on the Transport Layer Security (TLS) v1 standard from IETF (see http://wwwietforg/idsbywg/tlshtml)
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Basic security protects data
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Standardization: A Long, Slow Road
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The standardization process for Web services has followed a strange route and is not guaranteed to succeed with respect to the basic Web services technologies, let alone the additional technologies needed for industrial-strength Web services deployment Part of the reason is that the W3C acts deliberately and carefully and therfore slowly But, in addition, the W3C has not always succeeded in establishing its specifications in the marketplace In particular, the HTTP-NG (next generation) specification, intended to provide much the same functionality as SOAP, fell flat, in part because of vendor competition The original SOAP specification was developed outside of the W3C by a group of cooperating vendors that later joined with several others to submit the specification to W3C Most of these other additional technologies have followed a
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Page 157
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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similar route The W3C then initiated the XML Protocols Working Group, which resulted in SOAP v12 However, it took the working group a long time to develop the SOAP specification, and little substantive change resulted from the W3C process True adoption of Web services, especially the additional technologies and reference architecture required to make it useful technology for business, must follow an even more difficult and challenging route, as the technologies at this level are often ones on which companies compete more intensely with one another XML-based security standards are still evolving, but consensus seems to be converging on a proposed standard for authentication and authorization (SAML) and a proposed standard for public key management (XKMS) Also, of course, and fundamental to all Internet security, are the firewalls that protect private networks Firewalls map a publicly known IP address to another IP address on the internal network, thus establishing a managed tunnel and preventing unwanted access Additional security restricts access
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A password can be encoded by using base64 for minimal protection on the wire, even without SSL/TLS, but this does not provide any encryption and is therefore not very secure HTTPS can be used to ensure an additional level of protection HTTPS tunnels HTTP messages over a secure network connection protected by using the SSL/TLS protocol Browsers typically notify users when such a protected connection is being used SSL/TLS, and therefore HTTPS, is supported by most of the popular Web services enabled application servers, such as BEA's WebLogic, IBM's Websphere, and IONA's J2EE Edition
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Many XML security standards are being proposed and are still evolving for use with Web services Security is a complex problem encompassing data confidentiality and integrity, authentication, and authorization, and putting all the pieces in place takes time Meanwhile, basic encryption standards are available to secure transmissions on the wire using public keys, S/MIME, and HTTPS Past this point, some of the security proposals start to diverge: Microsoft, for example, may go its own way with security, which could lead to difficulties realizing the end-to-end security vision for Web services when NET platforms are included Other vendors that focus on security exclusively, such as Netegrity and Entrust, may end up with implementations of basic authentication and authorization services available over the Web and offer alternatives to Microsoft's Passport such as Liberty As with any standardization effort, however, things are managable when there is a small enough number of them For example, Society of Automotive Engineers (SAE) and metric measuring systems; these two are alternative standards for automobile parts tooling The market is able to support both With security, a single standard would be most effective, but two may be managable as long as conversion or mapping between them is possible SOAP over HTTPS with basic HTTP authentication will be the most common form of secure messaging for Web services But this isn't sufficient because Web services are essentially exposing access to programs and data stores Furthermore, with complex Web services, conversations may span multiple services that have been discovered dynamically or composed into a larger interaction, such as a process flow Web services will need an end-to-end security model for the entire conversation because sensitive information could be passed from service to
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