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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 DES Works in Detail
D ....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);
for(i=0;i {
sca ....etc

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S-DES Algorithm:-

Encryption:- Encryption algorithm takes an 8-bit block of plaintext and 10-bit key as input and produce an 8-bit block of ciphertext as output.
1. Encryption algorithm involves five functions:
1) an initial permutation function (IP)
2) a complex function (fk) which involves both substitution and permutation
3) a simple permutation function (SW) that switches two halves of data
4) the function f again
5) a permutation function that is the inverse of the initial permutation(IP-1).
2. The function fk takes as input ....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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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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i need to implement IPSEC on Ad hoc networks as we knew ipsec is a suite protocol which consists ESP and AH header protocol so ESP is implemeted using DES or AES and also i need to simulate on ns2 how? ....etc

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http://seminarsprojects.net/Thread-implementation-of-des-algorithm

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