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In [[cryptography]], '''security (engineering) protocol notation''' is a way of expressing a [[cryptographic protocol|protocol]] of correspondence between entities of a dynamic system, such as a [[computer network]]. In the context of a [[formal model]], it allows reasoning about the properties of such a system.
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The standard notation consists of a set of principals (traditionally named [[Alice and Bob|Alice, Bob]], Charlie, and so on) who wish to communicate. They may have access to a server S, shared keys K, timestamps T, and can generate [[cryptographic nonce|nonces]] N for authentication purposes.
 
A simple example might be the following:
 
:<math>A\rightarrow B:\{X_1\}_{K_{AB}}</math>
 
This states that '''A'''lice intends a message for '''B'''ob consisting of a [[plaintext]] '''<math>X_1</math>''' encrypted under shared key '''K<sub>AB</sub>'''.
 
Another example might be the following:
 
:<math>B\rightarrow A:\{N_B\}_{PK(A)}</math>
 
This states that '''B'''ob intends a message for '''A'''lice consisting of a [[cryptographic nonce|'''n'''once]] encrypted using public key of Alice.
 
A key with two subscripts is a [[symmetric key]] shared by the two corresponding individuals. A key with one subscript is the public key of the corresponding individual. A private key is represented as the inverse of the public key.
 
The notation specifies only the operation and not its semantics &mdash; for instance, private key encryption and signature are represented identically.
 
We can express more complicated protocols in such a fashion. See [[Kerberos (protocol)|Kerberos]] as an example. Some sources refer to this notation as ''Kerberos Notation''.<ref>
{{ cite journal
| last=Chappell
| first=David
| year=1999
| title=Exploring Kerberos, the Protocol for Distributed Security in Windows 2000
| journal=Microsoft Systems Journal
| url = http://www.microsoft.com/msj/0899/kerberos/kerberos.aspx
}}</ref> Some authors consider the notation used by Steiner, Neuman, & Schiller<ref>
{{cite conference
| last        = Steiner
| first      = J. G.
| authorlink =
| coauthors = Neuman, B. C.; Schiller, J. I.
|date=February 1988
| title = Kerberos: An Authentication Service for Open Network Systems
| conference = Usenix
| booktitle = Proceedings of the Winter 1988 Usenix Conference
| publisher = USENIX Association
| location = Berkeley, CA
| pages = 191–201
| url = http://clifford.neuman.name/publications/1988/198802-Usenix-Kerberos/198802-Usenix-Steiner-Neuman-Schiller-Kerberos.pdf
| format = PDF
| accessdate = 2009-06-10
}}</ref> as a notable reference.
<ref>
{{cite manual
| author=Davis, Don; Swick, Ralph
| title=Workstation Services and Kerberos Authentication at Project Athena
| date = 1989-03-17
| url = ftp://athena-dist.mit.edu/pub/ATHENA/kerberos/doc/user2user.ps
| format = PS
| accessdate =  2009-06-10
| quote = …our notation follows Steiner, Neuman, & Schiller,…
| page = 1
}}</ref>
 
Several models exist to reason about security protocols in this way, one of which is [[BAN logic]].
 
== References ==
 
<references />
 
{{crypto-stub}}
 
[[Category:Cryptographic protocols]]

Revision as of 04:13, 23 February 2014

Some consumers of computer are aware which their computer become slower or have several mistakes after utilizing for a while. But most persons don't know how to accelerate their computer and a few of them don't dare to operate it. They always find several experts to keep the computer inside wise condition however they have to spend several cash on it. Actually, you can do it by yourself. There are numerous registry cleaner software which we can get one of them online. Some of them are free and you merely need to download them. After installing it, this registry cleaner software usually scan the registry. If it found these mistakes, it can report we plus we can delete them to keep your registry clean. It is easy to operate and it is the most effective method to repair registry.

You may discover that there are registry cleaners that are free plus those which we will have to pay a nominal sum for. Some registry cleaners provide a bare bones program for free with all the choice of upgrading to a more advanced, effective adaptation of the same system.

It doesn't matter whether you are not quite obvious about what rundll32.exe is. But remember which it plays an important character inside sustaining the stability of our computers plus the integrity of the program. When several software or hardware couldn't reply usually to your system operation, comes the rundll32 exe error, that might be caused by corrupted files or missing data in registry. Usually, error content might shows up at booting or the beginning of running a program.

Registry products have been designed for 1 purpose - to wash out the 'registry'. This is the central database that Windows relies on to function. Without this database, Windows wouldn't even exist. It's so important, that your computer is frequently adding and updating the files inside it, even if you're browsing the Internet (like now). This really is terrific, however the problems occur when a few of those files become corrupt or lost. This occurs a lot, plus it takes a good tool to fix it.

Another thing you should check is whether or not the tuneup utilities 2014 program which you are considering has the ability to detect files and programs which are good. One of the registry cleaner programs we may try is RegCure. It is helpful for speeding up and cleaning up difficulties on your computer.

We could additionally see with it it is very easy to download and install. You could avoid those goods that might need you a rather complicated set of instructions. Additionally, you need to no longer need any additional program needs.

In additional words, when the PC has any corrupt settings inside the registry database, these settings usually make the computer run slower and with a great deal of mistakes. And sadly, it's the case which XP is prone to saving various settings within the registry in the incorrect method, creating them unable to run properly, slowing it down and causing a lot of errors. Each time we use a PC, it has to read 100's of registry settings... plus there are often a lot of files open at when which XP gets confuse plus saves countless in the incorrect method. Fixing these damaged settings might boost the speed of your system... plus to do that, we should look to employ a 'registry cleaner'.

By changing the way you utilize the web you are able to have access more of your valuable bandwidth. This can eventually provide you a quicker surfing experience. Here is a link to 3 ways to customize a PC speed found on the net.

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