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As was previously mentioned, such a system does not necessarily impose a unique hierarchy worldwide In the case of electronic payments, two banks or the fiscal authorities of two countries can mutually certify each other In the preceding example, assume that authorities X and Z have cross-certified their respective certificates If A wants to verify the authenticity of B, it is sufficient to obtain: X<<Z>>, Z<<B>> to form the forward certification path, and Z<<X>> to construct the reverse certification path This permits the clients of the two banks to be satisfied with the certificates supplied by their respective banks 51432 Perspectives for Evolution As was previously mentioned, the X509 directory [11] was inspired by the telephone directory However, in the absence of a central authority, the equivalence for the Internet is not exact.

To resolve these difficulties, the PKIX working group of the IETF has introduced the CMP of RFC 2510 and the OCSP of RFC 2560 to support X509-based certification on the Internet RFC 2585 [104] describes the conventions for using the File Transfer Protocol (ftp) and the HTTP to obtain certificates and certification revocation lists from their respositories Some authors question the validity of transposing the design of the telephone directory to this new environment In their view, association of a telephone number and an identity is much more stable than the link between an entity and the public key certificates Thus, attempts have been made to come up with simple distributed authentication structures such as the simple distributed security infrastructure (SDSI) that Ronald Rivest and Butler Lampson have proposed The design of such a system revolves around keys and not entities; ie.

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[38] Y Benezeth, P M Jodoin, B Emile, H Laurent, and C Rosenberger Review and evaluation of commonly-implemented background subtraction algorithms In Proceedings of the 19th International Conference on Pattern Recognition (ICPR), Dec 8 11, 2008, Tampa, FL, pp 1 4 [39] S Benhimane and E Malis Homography-based 2D visual tracking and servoing Int J Robot Res, 26(7):661 676, 2007 [40] Jeff Bilmes A gentle tutorial of the EM algorithm and its application to parameter estimation for Gaussian mixture and hidden Markov models Technical Report TR-97-021 International Computer Science Institute (ICSI), Berkeley, CA, 1998 [41] Stanley T Birch eld and Shrinivas J Pundlik Joint tracking of features and edges In IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2008, pp 1 6 [42] Samuel S Blackman and Robert Popoli Design and Analysis of Modern Tracking Systems Artech House, Nowood, MA, 1999 [43] Andrew Blake and M Isard.

, it is the access to a private key rather than the identity of an entity that plays the principal role for authentication Work in the simple public key infrastructure (SPKI) is focused on defining an authorization model rather than an authentication model This model avoids the need for a global naming authority, as each local authority can accord authorization in its local domain without interference of other local authorities If certification authorities are not organized hierarchically, the users themselves would have to construct the certification path In practice, the number of operations to be carried out can be reduced with various strategies, for example: 1 Two users served by the same certification authority have the same certification path, and the users can exchange their certificates directly This is the case for entities C and A in Figure 515 2.

If one user is constantly in touch with users that a particular authority has certified, that user could store the forward and return certification paths in memory This would reduce the effort for obtaining the other users certificates to a query into the directory 3 If two users know each other s certificates, they can mutually authenticate themselves without querying the directory This reverse certification is based on the confidence that each user has in his or her own certification authority..

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