Data encryption standard (des), Other Subject

Assignment Help:

Data Encryption Standard DES

The Data Encryption Standard (DES) specifies a FIPS accepted cryptographic algorithm as essential by FIPS 140-1. This publication provides a complete description of a mathematical algorithm for decrypting (deciphering) and encrypting (enciphering) binary coded information. Enciphering data converts it to an unintelligible form called cipher. Deciphering cipher converts the data back to its original form called plaintext. The algorithm described in this standard specifies both enciphering and deciphering operations which are based on a binary number called a key.

A key consists of 64 binary digits ("O"s or "1"s) of which 56 bits are erratically used and generated directly by the algorithm. The other 8 bits, which are not used by the algorithm, are used for error finding. The 8 error detecting bits are set to make the parity of every 8-bit byte of the key odd, i.e., there is an odd number of "1"s in every 8-bit byte1. Approved users of encrypted computer data must have the key that was used to encrypt the data in order to decrypt it. The encryption algorithm particular in this standard is generally known among those using the standard. The unique key chosen for use in a particular application makes the results of enciphering data using the algorithm unique.

Range of a different key causes the cipher that is formed for any known set of inputs to be different. The cryptographic security of the data depends on the security provided for the key used to encrypt and decrypt the data.

Data can be recovered from secret message only by using accurately the same key used to encipher it. Illegal receiver of the secret message who know the algorithm but do not have the correct key cannot obtain the original data algorithmically. Though, anyone who does have the algorithm and the key can easily decode the cipher and obtain the original data. A usual algorithm based on a secure key thus provides a basis for exchanging encrypted computer data by issuing the key used to encipher it to those certified to have the data.

Data that is measured sensitive by the liable authority, data that has a high value, or data that represents a high value should be cryptographically confined if it is susceptible to unauthorized exposé or unnoticed modification during transmission or while in storage. A risk analysis should be performed under the way of a responsible authority to determine potential threats. The costs of providing cryptographic security using these standard as well as substitute methods of provided that this protection and their relevant costs should be projected. An accountable authority then should make a choice, based on these analyses, whether or not to use cryptographic security and this standard.


Related Discussions:- Data encryption standard (des)

Electronic data interchange, ELECTRONIC DATA INTERCHANGE Electronic Dat...

ELECTRONIC DATA INTERCHANGE Electronic Data Interchange (EDI) refers to the planned transmission of data between organizations by electronic funds. It is used to transmit elect

Real time systems, time driven scheduling for real time operating systems...

time driven scheduling for real time operating systems report

American art journal, American Art (journal): American Art is a peer-revie...

American Art (journal): American Art is a peer-reviewed academic journal covering all aspects of past and present American visual art. The interdisciplinary journal has the fine a

Visual trespass - property is an illusion, Whatever the maxim cuiusest sol...

Whatever the maxim cuiusest solum may have signified to the common lawyer of earlier centuries, it has since become obvious that its legal meaning is now heavily qualified by the a

Theory of moral development, Question 1: a) Briefly describe Carol Gil...

Question 1: a) Briefly describe Carol Gillighan's theory of Moral development. b) Explain the term 'autonomous morality' as put forward by Piaget and is usefulness in clas

Knowledge of the stages of child growth, Question 1: (a) Knowledge of ...

Question 1: (a) Knowledge of the stages of child growth and development is believed to be an important aspect for a counselor. Discuss. (b) Using a concrete example, expla

Abrupt behavior, Sammy is a teenager working at the "A&P" in the summer, ne...

Sammy is a teenager working at the "A&P" in the summer, near the beach, as a cashier. Three girls in bathing-suit are ready to check out and go through Sammy's isle at the "A&P" gr

Excel help, Hello i am looking for a MS excel tutor. I dont need online tra...

Hello i am looking for a MS excel tutor. I dont need online training. I just need a person to go to to ask a quick question. My example question will be =Vlookup(B1&"|"&B2,D3:F13,3

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd