Private-Key Cryptography
• traditional private/secret/single key cryptography uses one key
• Key is shared by both sender and receiver
• if the key is disclosed communications are compromised
• also known as symmetric, both parties are equal
• hence does not protect sender from receiver forging a message & claiming is sent by sender
Public-Key Cryptography
• probably most significant advance in the 3000 year history of cryptography
• uses two keys – a public key and a private key
....etc

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#include
#include
#include
void main()
{
double p,q,n,m,e,k,z,d1,c1,c2,y;
double d,l,x,c,d2;
clrscr();
printf(The P,Q Primary values:);
scanf(%lf%lf,&p,&q);
n=p*q;
printf(N value is %lf,n);
k=(p-1)*(q-1);
printf(\n K(n) value is:%lf,k);
printf(\n Enter the Integer which is relative to the prime to the K(n));
scanf(%lf,&e);
d2=pow(e,-1);
d=fmod(d2,k);
printf(%lf,&d);
printf(\n Enter the plain text number );
scanf(%lf,&m);
d1=pow(m,e);
c=fm ....etc

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Implementation of RSA Algorithm Using Client-Server
Presented By:
GAUTHAM R

Introduction
In cryptography, RSA (which stands for Rivest, Shamir and Adleman ) is an algorithm for public-key cryptography.
It is the first algorithm known to be suitable for signing as well as encryption.
RSA is widely used in electronic commerce protocols, and is believed to be secure given sufficiently long keys and the use of up-to-date implementations.
Network security threats
Network Security Threats
Cryptography
Security in net ....etc

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plz send me this seminar documentation ....etc

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By
SANGEETA PATEL
And
PARTHA PRITTAM NAYAK

ABSTRACT
Security can only be as strong as the weakest link. In this world of cryptography, it is now well established, that the weakest page link lies in the implementation of cryptographic algorithms. This project deals with RSA algorithm implementation with and without Chinese Remainder Theorem and also using Variable Radix number System. In practice, RSA public exponents are chosen to be small which makes encryption and signature ....etc

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i'm working out my project on
kindly can any body share their ideas and help me please.....
thankq ....etc

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1. Introduction to Cryptography:
In the era of information technology, the possibility that the information stored in a person’s computer or the information that are being transferred through network of computers or internet being read by other people is very high. This causes a major concern for privacy, identity theft, electronic payments, corporate security, military communications and many others. We need an efficient and simple way of securing the electronic documents from being read or used by people other th ....etc

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INTRODUCTION
RSA Algorithm was discovered by a group of three scientists namely Ron Rivest,Adi Shamir and Len Adleman and was first published in 1978.
The RSA scheme is a block cipher in which the plain text and cipher text are integers between 0 and n-1 for some n.
A Typical size of n is 1024 bits or 309 decimal digits.
This is a public key encryption scheme.
In this scheme two pairs of integers {e, n} and {d, n} are used. First of them i.e. {e.n} is called the RSA public key and the other one i.e. {d, n} is called t ....etc

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RSA ALGORITHM IMPLEMENTATION



/********** RSA PROGRAM ***********/
/*d value should be less than 11 bcoz (c^d)modn can't be computed using available
datatypes*/
#include
#include
#include
void main()
{
char a={0ABCDEFGHIJKLMNOPQRSTUVWXYZ};
int n,i,j,s,n2,k1,p,q,d,m1,e1,l5,z,p2,s1,c;
unsigned long int l3,m,l4,k2;
double l2,l1,l6;
float e,l;
char p1;
clrscr();
printf(enter two prime numbers p and q\n);
scanf(%d %d,&p,&q);
do{
n=p*q;
if(n<26)
{ printf(\n n val ....etc

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The problem of factoring a large number into the constituent primes is a time old one and many a scientists have dedicated their time and effort for developing a compact and efficient factoring algorithm. The RSA encryption algorithm developed by Rivest, Shamir and Adelman based on primality testing and prime factoring is one of the best encryption algorithms in use today.
Here we discuss some of the recent developments in the field of primality testing and also a comparison study with the primality testing algorithm of the IIT?ians is also gi ....etc

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