A STUDY ON SECURITY USING RSA PUBLIC KEY CRYPTOGRAPHY

Abstract

Cryptography is the art of secret writing. The basic service provided by cryptography is the ability to send
information between participants in a way that prevents others from reading it.A Message in its original form is known as
plain text or clear text. The mangled information is known as encryption. The reverse of encryption is called decryption.The
main type of cryptographic Algorithm is Public key cryptography.
Public key cryptography is very useful because network security based on Public key technology tends to be more easily
configurable. Public key cryptography might be used in the beginning of communication for authentication and to establish
a temporary shared secret key, then the secret key is used to encrypt the remainder of the conversation using secret key
technology.
RSA today is used in hundreds of software products and can be used for key exchange, digital signatures, or encryption of
small blocks of data. RSA uses a variable size encryption block and a variable size key. The Key-pair is derived from a large
number, n, that is the product of two prime numbers chosen according to special rules; these primes may be 100 or more
digits in length each, yielding an n with roughly twice as many digits as the prime factors. The public key information
includes n and a derivative of one of the factors of n; an attacker cannot determine the prime factors of n from this
information alone and that is what makes the RSA algorithm so secure.