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Encyclopedia > Key distribution center

In cryptography, a key distribution center (KDC) is part of a cryptosystem intended to reduce the risks inherent in exchanging keys. KDCs often operate in systems within which some users may have permission to use certain services at some times and not at others. The German Lorenz cipher machine, used in World War II for encryption of very high-level general staff messages Cryptography (or cryptology; derived from Greek κρυπτός kryptós hidden, and γράφειν gráfein to write) is the study of message secrecy. ... A cryptosystem (or cryptographic system) is the package of all procedures, protocols, cryptographic algorithms and instructions used for encoding and decoding messages using cryptography. ... A key is a piece of information that controls the operation of a cryptography algorithm. ...

Contents

Security overview

For instance, an administrator may have established a policy that only certain users may use the tape backup facility. (Perhaps the administrator has concerns that unrestricted use might result in someone smuggling out a tape containing important information; but the precise


Operation

A typical operation with a KDC involves a request from a user to use some service. The KDC will use cryptographic techniques to authenticate requesting users as themselves. It will also check whether an individual user has the right to access to the service requested. If the authenticated user meets all prescribed conditions, the KDC can issue a ticket permitting access.


KDCs mostly operate with symmetric encryption. A symmetric-key algorithm is an algorithm for cryptography that uses the same cryptographic key to encrypt and decrypt the message. ...


In most (but not all) cases the KDC shares a key with each of all the other parties. A key is a piece of information that controls the operation of a cryptography algorithm. ...


The KDC produces a ticket based on a server key. Ticket (unseperated) of the Kurkino in Berchtesgaden CeBIT Home 1998 student day ticket with barcode A Parisians transport ticket Ticket can mean one of several things: // Permission A ticket is a voucher to indicate that one has paid for admission to a theatre, movie theater, amusement park, zoo, museum... In information technology, a server is a computer system that provides services to other computing systems—called clients—over a network. ...


The client receives the ticket and submits it to the appropriate server. In computing, a client is a system that accesses a (remote) service on another computer by some kind of network. ... In information technology, a server is a computer system that provides services to other computing systems—called clients—over a network. ...


The server can verify the submitted ticket and grant access to the user submitting it.


Security systems using KDCs include Kerberos. Kerberos is a computer network authentication protocol which allows individuals communicating over an insecure network to prove their identity to one another in a secure manner. ...


Benefits

In telecommunications and software engineering, scalability indicates the capability of a system to increase total througput under an increased load when resources (typically hardware) are added. ...

Drawbacks


  Results from FactBites:
 
[ Ant ] K ◁ GIST ◁ Glossaries ◁ Overview ◁ Security Matters (2689 words)
The KDC encrypts the second set in the KEK it shares with Bob, and either sends that encrypted set to Alice for her to forward to Bob, or sends it directly to Bob (although the latter option is not supported in the ANSI standard [A9017]).
The matching private key is kept secret by the owner, who uses it to decrypt data, generate a digital signature, verify a protected checksum, or generate a key in a key agreement algorithm.
The center decrypts the set, reencrypts the set in the KEK it shares with Bob, and either sends that encrypted set to Alice for her to forward to Bob, or sends it directly to Bob (although direct distribution is not supported in the ANSI standard [A9017]).
Key Distribution - Key Distribution Center inventions (860 words)
Key Distribution Center patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.
An information processing system and method using an encryption key block sets sub-trees classified based on data processing ability of the devices (capability) in a key tree in which respective keys are corresponded to a root, nodes and leaves of a tree in which a plurality of devices are constituted...
Generic session keys are pre-generated and stored in a pool of session keys for later use in communicating within a communications environment.
  More results at FactBites »

 
 

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