Data encryption standard (des), Other Subject

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.

Posted Date: 10/12/2012 8:40:38 AM | Location : United States







Related Discussions:- Data encryption standard (des), Assignment Help, Ask Question on Data encryption standard (des), Get Answer, Expert's Help, Data encryption standard (des) Discussions

Write discussion on Data encryption standard (des)
Your posts are moderated
Related Questions
Profit maximiZation is theoretically the most sound but practically unattainable objective of business finns. Do you agree this statement? If agree give valid reasons.

Art Criticism: While most people think of 'criticism," they think instantly of the word and its negative connotations. To criticize is to "find fault with," in according to one de

Assignment 1 1.1 Brief background of the project The purpose of the mission fire Project is to get better the structural capabilities of the Shuttle Launch Booster, a launch rocket

Review the following cases: Case 1 Case 2 After you have reviewed the cases above, write an essay that addresses the following: Define social responsibility. What are the simila

Discovery and invention of Blue-Native Page (BN- PAGE) BN- Page is the most efficient non-denaturing gel system which came up with the challenge of separating different kinds o

Question 1 What are the forms of ownership for newspapers? Explain in detail Question 2 How can employees of an organization be rewarded? Discuss the tips for effective recog

I could really use some help with this reading guide for Angel of Death - The story of smallpox by Gareth Williams. My dad had a stroke 2 days ago and he needs 24/7 care and my mom

What were the most revolutionary social and economic developments of the last quarter of the nineteenth century? How did different groups of americans respond to those changes and

Intermittent catheterisation (IC) has a lower risk of infection compared with indwelling catheterisation, and so should be considered in preference to an indwelling catheter. Inter

Cargo Management: Project Name : Cargo Management Role : Managing & Leading the Team. Involved in Gathering, Estimation, System Design, Database Design. Documentation