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Appendix C
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Kerberos*
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In 5, you learned about authentication using digital signatures. You may have heard about Kerberos, an alternative authenticating technique. Kerberos is an authentication service developed by the Project Athena team at MIT, based on a 1978 paper by Roger Needham and Michael Schroeder. The first general-use version was version 4. Version 5, which addressed certain shortfalls in version 4, was released in 1994. Kerberos uses secret-key ciphers for encryption and authentication. Version 4 used only DES. Unlike a public-key authentication system, Kerberos does not produce digital signatures. Instead, Kerberos was designed to authenticate requests for network resources rather than to authenticate authorship of documents. Thus, Kerberos does not provide for future third-party verification of documents. In a Kerberos system, a designated site on each network, called the Kerberos server, performs centralized key management and administration. The server maintains a database containing the secret keys of all users, authenticates the identities of users, and distributes session keys to users and servers that wish to authenticate one another. Kerberos requires trust in a third party (the Kerberos server). If the server is compromised, the integrity of the whole system is lost. Public-key cryptography was designed precisely to avoid the necessity to trust third parties with secrets. Kerberos is generally considered adequate within an administrative domain; however, across domains, the more robust functions and properties of public-key systems are often preferred. Some developmental work has been done to incorporate public-key cryptography into Kerberos. For detailed information on Kerberos, read The Kerberos Network Authentication Service (V5) (J. Kohl and C. Neuman, RFC 1510) at ftp://ftp.isi.edu/in-notes/rfc1510.txt.
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*(Source: RSA Labs)
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Further Technical Details
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In 6, you learned about certificates. The minimum contents of a certificate are the owner s name, public key, and the CAs signature. For RSA, the public key is the modulus and public exponent. For DH, ECDH, DSA, and ECDSA, the public key consists of the system parameters and a public value. Often, messages contain certificates. For example, if Pao-Chi sends a signed message to Daniel, Daniel needs Pao-Chi s certificate to verify the signature. Pao-Chi can include his certificate as part of the message, saving Daniel the trouble of searching for it in public directories. If Satomi wants to pose as Pao-Chi, she could send a message with a certificate containing Pao-Chi s name but not his true public key. But she will have to get that certificate signed by a CA whose certificate was signed by the root that Daniel will use. Satomi will have to break the root s key to become the root (and hence create her own CA) or break a CA s key to create a valid certificate. That s not likely, so including the certificate in a message is no security problem. Because messages contain certificates and because larger messages are sometimes expensive, it s often desirable to create smaller certificates. A protocol or company might demand that names be short (for example, that they carry no title, mailing address, fax number, or other such information) or that there be no extensions or attributes. In the past, people have proposed shrinking public keys. DH, ECDH, DSA, or ECDSA keys can be compressed by excluding the system parameters. Everyone would have to get the system parameters in some other way. But this is not a good idea. The purpose of a certificate is to guarantee that an attacker could not replace a true public key with a fake one. But if the parameters are not part of the certificate, an attacker could replace the parameters. Someone using a public key extracted from a certificate (creating a digital envelope or verifying a signature) would be certain of using the correct public value but not the correct parameters. If Satomi, for example, replaces the parameters on Pao-Chi s machine and if Pao-Chi tries to send a message to Daniel, he will create something that Daniel cannot read. Satomi almost certainly won t be able to read it either (she would still need to know Daniel s private value), so all she would be doing by changing the parameters would be creating a nuisance. This is a denial-of-service attack because her actions would deny Pao-Chi and Daniel the service of secure communication.
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