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6.3 Summary 280 Lotus Security Handbook Receiving signed S/MIME messages Upon receipt of signed e-mail, Notes will try to verify the validity of the signature. If the user trusts the signing certificate, that is, if the user has a certificate of the signer or an Internet cross-certificate to the sender, a message will be displayed in the Notes client’s status bar indicating the validity of the signature, an example of which is the following: "Signed By: Bob, at 10:52 AM, According To: TestCertAuthority". If the user doesn’t trust the signing certificate, the user will receive a prompt to create an Internet cross-certificate on demand. The user can select the subject name of the certificate in the message that the user wishes to trust. Note: Signed S/MIME messages contain the certificate chain of sender and signers. The resulting Internet cross-certificate is stored in the receiver's Personal Address Book. By creating the cross-certificate, the user is asserting that he or she trusts a certificate contained in the S/MIME signed message. Signature verification can then proceed. Finally, it is also possible for the user to manually store the sender's address and X.509 certificates to his or her Personal Address Book. When viewing S/MIME signed mail, the user should select the Actions → Tools → Add Sender to Address Book menu options. It’s important to note here that this certificate is not an Internet cross-certificate, meaning it is not used when sending or receiving signed S/MIME e-mails, it is used to encrypt messages from the user to the sender. While the Internet permits individuals and organizations to communicate like never before, at the same time, the single greatest problem with the Internet has been, and still is, the problem of “who can be trusted?” This chapter showed the role that public key infrastructures can play in establishing this trust and ensuring its integrity. This is done through the use of X.509 certificates in conjunction with established protocols (for example, SSL) and in conjunction with established messaging standards (for example, S/MIME). As well, this chapter showed how support for X.509 certificates is implemented in Notes and Domino and how certificates are requested, approved, generated, and installed in a Notes and Domino infrastructure.
Chapter 7. Single sign-on In this chapter we discuss single sign-on (SSO) concepts and technical methods we can use to facilitate it. Strictly speaking, single sign-on is a term to describe the end-user experience, not the technical implementation. We start by providing a more formal definition of SSO: “A mechanism whereby a single action of user authentication and authorization can permit a user to access all computers and systems where that user has access permission, without the need to enter multiple passwords.” This definition is from The Open Group’s Web site at: http://www.opengroup.org/security/l2-sso.htm 7 The key point is that the user is required to log in (authenticate) to an application one time, and not need to re-authenticate when accessing a second application or server within the context of a same session. This approach implies a number of valuable benefits, but also has some drawbacks. The benefits to the end users are: ► Only one authentication mechanism to remember. For password-based authentication, this means users only have to remember one password. ► If using passwords, users only have to update one password and follow one set of password rules. © Copyright <strong>IBM</strong> Corp. 2004. All rights reserved. 281
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* Notes SDK include files */ #inclu
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* *********************************
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Hostname="localhost.dotnsf.com" Por
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