Page 158 in VS .NET

Creating QR Code ISO/IEC18004 in VS .NET Page 158
Page 158
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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service A Web service interaction also might involve multiple parties using different securityrelated technologies These requirements can be met with a combination of HTTP basic authentication and HTTPS, but a Web service may have to authenticate the request over and over again when multiple parties are involved SAML provides a way for a Web service to reuse an assertion made by a trusted entity, although the user still has to satisfy each individual Web service's protocol For example, if a service requires S/MIME formatting, the requester must adhere to S/MIME, even with a valid SAML assertion HTTPS is not sufficient
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SAML
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Security Assertions Markup Language (SAML), an OASIS initiative, provides a standard way to profile information in XML documents and to define user identification and authorization information SAML implementations provide an interoperable XML-based security solution, whereby user information and corresponding authorization information can be exchanged by collaborating services SAML defines standard XML formats for authentication and authorization information that can be propagated along a call chain, using any transport technology SAML enables single sign-on and end-to-end security for Web services Users can travel across sites with their entitlements so that companies and partners in a trusted relationship can deliver single signon across sites Here is an example
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SAML Request:
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< xml version="10" encoding="UTF-8" >
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< Request
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xmlns="http://wwwoasis-openorg/committees/security/docs/ draft-sstc-sch
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ema-protocol-19xsd" xmlns:ds="http://wwww3org/2000/09/xmldsig#"
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xmlns:saml="http://wwwoasis-openorg/committees/security/docs/
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draft-sstc-schema-assertion-19xsd"
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xmlns:xsi="http://wwww3org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://wwwoasis-openorg/committees/security/
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docs/draft-sstc-schema-protocol-19xsd d:/platform/draft-sstc-schema-protocol-19xsd"
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RequestID="String"
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MajorVersion="0" MinorVersion="0" >
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< AuthenticationQuery>
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<saml:Subject>
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< saml:NameIdentifier Name="admin" SecurityDomain="UserID"/>
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< saml:NameIdentifier Name="admin" SecurityDomain="Password"/>
< /saml:Subject> < /AuthenticationQuery> </Request < Response xmlns="http://wwwoasis-openorg/committees/security/docs/ draft-sstc-schema-protocol-19xsd"
xmlns:ds="http://wwww3org/2000/09/xmldsig#"
xmlns:saml="http://wwwoasis-openorg/committees/security/docs/
draft-sstc-schema-assertion-19xsd"
xmlns:xsi="http://wwww3org/2001/XMLSchema-instance"
xsi:schemaLocation="http://wwwoasis-openorg/committees/security/
docs/draft-sstc-schema-protocol-19xsd d:/platform/draft-sstc-schema-protocol-19xsd"
ResponseID="String"
MajorVersion="0" MinorVersion="0" StatusCode="Success"
InResponseTo="requestId">
< /Response>
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Understanding Web Services- XML, WSDL, SOAP and UDDI
The example illustrates the use of SAML request and response This format can be propagated using SOAP headers to ensure that authentication information is available when a message is propagated from one point to another along a Web services call chain, so that the appropriate authorization checks can be made at each point The response indicates a successful match for the username and password submitted in the request SAML propagates authentication information
XKMS
The XML Key Management Specification (XKMS) defines a protocol for distributing and registering public keys used in encrypting and decrypting messages transmitted using SOAP and other transports XKMS is designed for use with the W3C XML Signature specification (XML SIG), developed jointly by W3C and IETF XKMS includes two major parts: the XML Key Information Service Specification (X-KISS) and the XML Key Registration Service Specification (X-KRSS) XKMS mechanisms manage public key encryption
X-KISS defines a mechanism to resolve public key information contained in XML-SIG elements X-KISS allows a client to delegate part or all of the tasks required to process key information elements to an underlying service implementation Applications thereby can be abstracted from the underlying Public Key Infrastructure (PKI) implementation used to establish trust relationships The underlying PKI may be based on any one of a number of specifications, including PKI for X509 certificates (PKIX), Simple Public Key Infrastructure (SPKI), and Pretty Good Privacy (PGP) X-KRSS defines a Web service that accepts registration of public key information Once registered, the public key may be used with other Web services, including X-KISS X-KISS defines a wrapper around an underlying PKI service, whereas X-KRSS defines a Web service for registering PKI information Both protocols are defined using XML schemas, SOAP, and WSDL Expression of XKMS in other compatible object encoding schemes is also possible Trust services wrapped by X-KISS can manage private/public key pairs for digital signatures The entire process of registering, fetching, and revoking keys can be delegated to the trust service XKMS specifies an XML protocol to access the key management functions of a trust service Trust service functions include all the features necessary to sign and seal documents digitally, so that only the intended recipient can view and manipulate the content X-KISS extends basic application server functionality
Application servers, such as BEA's WebLogic and IONA's J2EE Edition, typically store keys but do not provide management functions, such as key renewal and revocation checking Services hosted on such a server fetch keys from a local key store and use them to sign a document, using