c program in computer program




C Program to reverse a number :- This program reverse the number entered by the user and then prints the reversed number on the screen. For example if user enter 123 as input then 321 is printed as output. In our program we have used modulus(%) operator to obtain the digits of a number, we store the digits in an array, pow functions of math.h is used to obtain the reverse of the given number.


Palindrome Numbers
Palindro ....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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Many algorithms for achieving mutual exclusion in distributed computing systems have been proposed. The three most often used performance measures are the number of messages exchanged between the nodes per Critical Section (CS) execution, the response time, and the synchronization delay. In this paper, we present a new fully distributed mutual exclusion algorithm. A node requesting the CS sends out the request message which will roam in the network. The message will be forwarded among the nodes until the requesting node obtains ....etc

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IMPLEMENTATION OF AES, RSA, ECC

Abstract:
In this world of increasing electronic connectivity of viruses, hackers, eaves-dropping and electronic fraud, electronic security is necessary always for transmitting secure electronic-data across insecure networks such as the internet. So, in order to ensure this electronic security, cryptography evolved leading to the development of various cryptosystems.
The main objective of this project is to develop three such cryptosystems- Advanced Encryption Standard (AES), Rivest Shamir Adleman (RSA) Cry ....etc

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Public key cryptosystems were invented in the late 1970's, with some help from the development of complexity theory around that time. It was observed that based on a problem so difficult that it would need thousands of years to solve, and with some luck, a cryptosystem could be developed which would have two keys, a secret key and a public key. With the public key one could encrypt messages, and decrypt them with the private key. Thus the owner of the private key would be the only one who could decrypt the messages, but anyone knowing the publ ....etc

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Public key cryptosystems were invented in the late 1970â„¢s, with some help from the development of complexity theory around that time. It was observed that based on a problem so difficult that it would need thousands of years to solve, and with some luck, a cryptosystem could be developed which would have two keys, a secret key and a public key. With the public key one could encrypt messages, and decrypt them with the private key. Thus the owner of the private key would be the only one who could decrypt the messages, but anyone knowing the ....etc

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http:// ....etc

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ABSTRACT

The main objective of our Project is to show that Elliptical Curve Cryptography is better than RSA. Which means than the ECC maintains a constant key size regarding the amount of data transferred i.e. the key size will be constant where as in RSA key size varies with increase in transfer of data. By having this type of properties this algorithm can be used in different applications efficiently. This algorithm is widely applicable to the huge organizations like military. As in the military network large amounts of very ....etc

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By carefully measuring the amount of time required to perform private key operations, attackers may be able to find fixed Diffie-Hellman exponents, factor RSA keys, and break other cryptosystems.Against a vulnerable system, the attack is computationally inexpensive and often requires only known ciphertext. Actual systems are potentially at risk, including cryptographic tokens, network-based cryptosystems, and other applications where attackers can make reasonably accurate timing measurements. Techniques for preventing the attack for RSA and Dif ....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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