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In today’s electronic era, wealth of electronic information are accessing over the Internet. Several important information and private data transferring over the Internet are being hacked by attackers via latest communication technology. So, maintaining the security of secret data has been a great challenge. To tackle the security problem, cryptographic methods as well as steganographic techniques are essential. This paper focuses on hybrid security system using cryptographic algorithm and text steganographic technique to achieve a more robust security system. In this work, to overcome the limited data hiding capacity, suspiciousness, and data damaging effect due to modification, of traditional steganographic techniques, a new technique for information hiding in text file is proposed. The proposed approach conceals a message, without degrading cover, by using first, second, second last, and last letter of words of the cover text. Hence, from the embedding capacity point of view, its capacity depends on the similarity of characters of the words in cover text. In addition, as further improvement for security, secret message encryption is performed using Blowfish algorithm before hiding into the innocuous cover text.

The key exchange process is a very important feature for many parts in cryptography. In data encryption, symmetric encryption techniques need to share the same secret key securely between two parties before encryption and this is a challenging task for secure data transmission. Most symmetric key encryptions and key management systems widely use Diffie-Hellman Key Exchange (DHKE) algorithm for the purpose of key distribution because it has simple computation and supports forward security. However, there is no key authentication and Man-In-The-Middle (MITM) attack has occurred during the key generation process. To overcome this problem, a new hash function is proposed to get the public key integrity during the public key sharing process of DHKE algorithm. This hash function is created by using six bitwise operators and operated in a variable length of the rounds depending on message length. Thus, the proposed system improves the security of DHKE and grantees the user authentication requirements.