DSA <Digitalized signature algorithm>

Reading: D s a
Full spelling: Digital Signature Algorithm
Field:
Security > electronic signature > DSA

Applying the open key code which is based on discrete logarithm problem, it was developed, one of digitalized signature systems. It was developed in 1991 by NSA (American National Security Agency), it was appointed to the digitalized signature system of the American government standard to 1994 by NICT (National form technical bureau).

DSA being something which improves the ElGamal signature which was developed on the basis of ElGamal ([erugamaru]) code, shortening length of signature to 160 bit ×2, improves processing efficiency, adopts SHA-1 which is one of hash functions in formation of the signature key.

DSA and ElGamal code/signature, in basis of difficulty of decipherment discrete logarithm problem (DLP: Discrete Logarithm Problem) with problem of the mathematics which is called is utilized. As for this, “when giving prime p and constant g, but as for the remainder (designating this as y,) which divides x power of g with p vis-a-vis a certain integer x requesting easy, with the problem that it is difficult to seek x from y,”, the key without knowing, code is deciphered is suitable to the thing which seeks x from y.

DS-CDMA

Reading: D s sea D m a
Full spelling: Direct Spread Code Division Multiple Access
Field:
Portable telephone > 3G > DS-CDMA

At one of IMT-2000 standard, the communication method which is proposed originally as “W-CDMA” from Japan and Europe etc. Bandwidth of the channel which spreads the data is widely taken above rising descent each 5MHz, the data which each terminal dispatches spreads to the whole zone. It is designed in such a way that GSM system and the affinity which presently are utilized in Europe are high, being common, can utilize the switchboard and the like.

With DS-CDMA, we do “the spread” processing of two stages the case of transmission of the signal, do “the opposite spread” processing of two stages conversely when receiving and remove the original signal. The case of spread in order to use the spread mark which differs every terminal, this carries out a kind of cryptographic role.

DSI

Reading: D s eye
Full spelling: Dynamic Systems Initiative
Field:
Enterprise information system > computer system > large-scale system > DSI

That the Microsoft corporation will offer to the developer of Windows application, the basis in order it has been about, to construct the computing system of self management type. You have aimed toward the fact that the function which you adjust automatically the various resources which form the computer system, according to the increase and decrease of request from the user is offered.

For example, when the mass visitor visits suddenly in the Web sight, also with the number of Web servers who respond and memory capacity and the CPU time which are allotted inside the server in combination to that, it is necessary to increase, but presently this must be adjusted by human strength.

If the system of self management type actualizes, the software judging such adjustment by your, it reaches the point where it can do appropriate resource allotment automatically. With DSI conception, the function which becomes the basis is integrated to Windows, toward the fact that the expedient which installs that kind of function in application is integrated to the development tool has aimed.

DSL <Domain specific language>

Reading: D s l
Full spelling: Domain Specific Language
Field:
Programming > language > DSL

Specializing in accomplishment of job of specification, and the solution of problem it is the programming language which is designed.

As for DSL in order, to correspond to the various territories such as the generalized programming language C language and like Java and the general-purpose modeling language like UML, the general-purpose language which is made it is something which is located the counter electrode.

At UNIX there is a history and a result which DSL for a long time such as shell script, utilize there calls the thing of DSL “Little language” or “mini- language”. In addition, also macrofacility and the like of the spreadsheet program is one kind of DSL.

There are also some which as for DSL when formation of the feasibility file is not designated as purpose, are many, are designed for describing the graphics file and the audio file. In addition, also utilization form to be various in comparison with general-purpose language, like macro being installed by the application software, from those which are utilized for mounting the complicated processing, feasibility ones, being called from other programming language independently and/or imbedding to those which are utilized, it is mounted in various ways.

DSL <xDSL>

Reading: D s l
Full spelling: Digital Subscriber Line
Field:
Communication service > broadband > xDSL > DSL