International Journal of Network Security
Security is of utmost importance in present day communications. But the communication networks such as mobile networks and Internet are public media and are not suitable for direct transmission of confidential information. Sensitive information like medical and legal records, credit ratings, business transactions, voice mail and images like a protected geographical area of military importance or drawings which correspond to critical components of the system, defense information are routinely exchanged through Internet. Cryptography is a practical means for protecting this private information.