i m doing dissertation in cryptography based digital image watermarking for gray scale image...so i need matlab source code for encryption and decryption for gray scale image ....etc

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plzzz help me... i need c code for des..thank u in advance ....etc

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Performance Analysis of SAFER+ and Triple DES security algorithms for Bluetooth Security Systems
Abstract
In this paper, comparison of the SAFER+encryption algorithm and Triple DES algorithm forBluetooth security systems is done. Performance of theabove security algorithms are evaluated based on theefficiency of the algorithm. The whole design wascaptured entirely in matlab. In order to check theefficiency of the algorithm, noise is being added to theencrypted data and the output is seen to be obtainedwithout any incorrectness which ....etc

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The DES Algorithm Illustrated



Some Preliminary Examples of DES
DES works on bits, or binary numbers--the 0s and 1s common to digital computers. Each group of four bits makes up a hexadecimal, or base 16, number. Binary 0001 is equal to the hexadecimal number 1, binary 1000 is equal to the hexadecimal number 8, 1001 is equal to the hexadecimal number 9, 1010 is equal to the hexadecimal number A, and 1111 is equal to the hexadecimal number F.


How DE ....etc

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c code to implement des algorithm,also substitution and transposition ....etc

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The Study and Application of Integrating Axiomatic Design and TRIZ for Conceptual Design

Qihua Tian ∗a,b, Yifang Zhong a , Renbin Xiao a , Yixian Du b , Hongmei Yang b
aCAD Center, School of Mechanical Science & Engineering, HuaZhong University of Science and Technology, Wuhan, P.R. China
b
College of Mechanical & Material Engineering, China Three Gorges University, Yichang, P.R.China


Abstract:
AD(Axiomatic Design) and TRIZ(Theory of Inventive Problem Solving) are widely used in conceptual ....etc

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Abstract
To encrypt a text _le and to decrypt the encrypted form of the _le to get the original input text _le. This encryption and decryption is done using the most widely used private key encryption scheme based on data encryption standard (DES) adopted in 1977 by National Bureau of Standards.It was designed by IBM based on their own Luci_er cipher and input from NSA.For DES, data are encrypted in 64-bit blocks using a 56-bit key. The algorithm transforms 64-bit input in series of steps into a 64-bit output of cipher text. The same steps, w ....etc

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Data Encryption Standard (DES)
• Financial companies found the need for a cryptographic algorithm that would have the blessing of the US government (=NSA)
• First call for candidates in May 73, followed by a new call in August 74
• Not very many submissions (Why?)
– IBM submitted Lucifer
• NSA worked with IBM in redesigning the algorithm
DES
• DES became a federal standard in November 76
– NBS (NIST) hardware standard in January 77
– ANSI X3.92-1981 (hardware + software)
– ANSI X3.106 ....etc

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Program for DES
#include
#include
void main()
{
int a,b,c,i,j,k,l,m,n,x1;
int p,q,r,s,d,y,e,z=0;
clrscr();
printf(\n Enter the plain Text number:\n);
scanf(%d,&n);
printf(\n Enter the key number \n);
scanf(%d,&k);
printf(\n Enter the bit stream \n);
for(i=0;i {
scanf(%d,&a);
}
p=n\2;
x1=p-k;
for(i=0;i<=x1;i++)
{
c=0;
z++;
}
z=z-1;

printf(\n Enter the Key bit Stream\n);
fo ....etc

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des algorithm encryption for hello example ....etc

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