Public Key Cryptography

The text provides a introduction to public key cryptography. It’s need and advantages over secret key cryptogrophy. Key management problem in secret key cryptosystem is solved by public key cryptography. RSA standards provide method for asymmetric key encryption. RSAES-OAEP, specific algorithm, uses RSA standards for encryption .It is explained in brief with its premitives. OAEP technique uses the concept of padding the hashed (coded) text by some random bits. This will strengthen the cryptosystem against various attacks. Padding of bits to encrypted data prevents the attack that uses method of prediction.