hi i want the dis advantages if des algorithm ,please help me ....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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to get information about the topic c code to implement des algorithm full report ppt and related topic refer the page link bellow

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

http://seminarsprojects.net/Thread-implement-des-algorithm ....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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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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to get information about the topic des algorithm example full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-implementation-of-des-algorithm ....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 DES Works in Detail
D ....etc

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What scrambling/ encryption does Hughesnet use in the 2 way communication provided by their services?

Any help or page link would be helpful

Thank you

Caleb Boston ....etc

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I am sarath, 4th year b tech student. I have to present a seminar on any topic of computer science. I select the topic pgp encription .I have no idea about the topic and this is a good choice.please help me by giviving a detail information about this topic. ....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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