{"id":878,"date":"2018-12-03T10:49:50","date_gmt":"2018-12-03T10:49:50","guid":{"rendered":"http:\/\/www.gyanvihar.org\/journals\/?p=878"},"modified":"2019-05-28T13:20:56","modified_gmt":"2019-05-28T13:20:56","slug":"enhancing-security-of-steganographic-system-using-tdea","status":"publish","type":"post","link":"https:\/\/www.gyanvihar.org\/journals\/enhancing-security-of-steganographic-system-using-tdea\/","title":{"rendered":"Enhancing Security of Steganographic System using TDEA"},"content":{"rendered":"

1<\/sup>Manoj Kumar Ramaiya, 2<\/sup>Dinesh Goyal, 3<\/sup>Naveen Hemrajani<\/strong><\/p>\n

1<\/sup>Research Scholar, Computer Engineering, SGVU, Jaipur<\/p>\n

2<\/sup>Principal, School of Engineering, SGVU, Jaipur<\/p>\n

3<\/sup>Head Computer Engineering, JECRC University, Jaipur<\/p>\n

Abstract: The security of data over unsafe communication network has always been a primary concern in the attention of researchers. With the rapidly growing practise of the internet in all personnel and business drives, the concern for the illegal access by an intruder and later misuse, has further put strain on the industry for developing means and techniques to overcome this.<\/strong><\/p>\n

Cryptography involves transforming a confidential data into unintelligible forms or ciphertext might produce suspicious in the mind of opponents. On the other hand, Steganography implant secrete message in to a cover media and hides its presence. As a normal practise, data embedding is employed in communication, image, text or multimedia contents for the purpose of copyright, authentication and digital signature etc.<\/strong><\/p>\n

Both techniques provides the sufficient degree of security but are vulnerable to intruder\u2019s attacks when used over unsecure communication channel. Attempt to combines the two techniques i.e. Cryptography and Steganography, did results in security improvement. The existing steganographic algorithms primarily focus on embedding strategy with less consideration to pre-processing of data which offer flexibility, robustness and high security level. The proposed work presents a unique techniques for image steganography based on \u201cTriple Data Encryption Algorithms (TDEA)\u201d using the strength of multiple encryption enhancing the security level over unsafe communication channel.<\/strong><\/p>\n

Keywords: <\/em><\/strong>Image Steganography, Cryptography, LSB insertion, DES, Multiple encryption, TDEA.<\/p>\n

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  1. INTRODUCTION<\/li>\n<\/ol>\n

    Keeping an information safe while communicating it to somebody at a distance has been in the attentions of individuals since the early age, so very rudimentary to present day highly specified computer based methods have been developed. The past three or four decade led to the wide spread transfer of data from one end to the other end of the world. The remarkable growth of the internet also generate and eased various E- Commerce applications. This demand the assurance of security of data and any misuse possible from this theft data. Further the communication between private parties demanding absolute privacy also necessitate the data transmission in modified or encoded mode.<\/p>\n

    In multimedia communication the necessity of privacy and confidentiality gains additional importance mainly in open, unsecure communication network like internet. Present era of universal connectivity, of viruses, intruders, eavesdropping and digital fraud need to safe-guard information from releasing into erroneous hand.<\/p>\n

    Cryptography techniques [6,7] scramble a source message in to unintelligible form so it cannot be understood while steganography hides the message in to other media, so it cannot be perceived. The term steganography [2,4] derives from the Greek Steganos<\/em> which means \u201ccovered\u201d and\u00a0Grafia <\/em>means \u201cwriting\u201d i.e. Steganography means \u201ccovered writing \u201c [5] . Thus the stego image should not differ much from cover image.<\/p>\n

    Cryptography and Steganography are extensively used in the field of information hiding [1] and has received attention from the businesses and academic world in the past. Former conceals the original data but latter conceal the very fact that data is hidden.<\/p>\n

    \u00a0 \u00a0 \u00a0 \u00a0II.RELATED WORKS<\/p>\n

    There are large number of steganographic techniques proposed in literature. Image steganography is a method for hiding information into a cover image. Least Significant-Bit (LSB) based methods [22] is common steganographic practise in spatial domain due to its easiness and hiding capacity. All the obtainable methods of steganography concentrate on the embedding method with less concern to the pre-processing, such as encryption of secrete image.<\/p>\n

    More recently, researcher\u2019s hides [5] secret messages in image by replacing the least significant bit of each byte of the image pixel with the bits of the message. The original image is not significantly changed. Most image format identify more shades of colour than the human eye can notice. The message is successfully be extracted this at the receiver end. Steganography goes well beyond simple embedding text in an image.<\/p>\n

    Considering the strengths and weakness of steganography and cryptography, researchers tried to combining them in practice, so that the new method would simultaneously possess the advantages of steganography and cryptography while overcoming the respective weaknesses.<\/p>\n

    Idea employing the two techniques in tandem, The techniques describe by Singh and Malik [13] uses blowfish encryption algorithm for encrypting the text message rendering it non readable and secure. The LSB techniques of steganography further enhance the security.<\/p>\n

    Text encryption with DES and LSB insertion Dhawal Seth et Al [14] combines cryptography and steganography, so as to ensure more security over insecure communication channel. DES cryptographic algorithm being used for encrypting the text message in conjunction with LSB substitution for embedding the encrypted message in the cover image.<\/p>\n

    Most of the hybrid system uses cryptographic algorithms to encrypt text message and hide the ciphertext by LSB steganography. To our knowledge no techniques proposed cryptography for encrypting image (image encryption). Proposed system uses cryptographic techniques for encrypting secrete message i.e. image and then hiding this encrypted image is hide in to cover image by using LSB embedding.<\/p>\n

    A. DES and TDEA<\/strong><\/p>\n

    DES given the possible susceptibility to brute-force attack, there has been significant attention in finding an alternate to DES. One approach is to finding completely new algorithm and AES is example of that. Other alternative to use existing DES with multiple encryption and multiple keys. The initial standard that describes algorithm ANS<\/p>\n

    X9.52 available in 1998 is \u201cTriple Data Encryption Algorithm (TDEA)\u201d . FIPS PUB 46-3 also describe TDEA.<\/p>\n

    Triple DES uses a key package that consist of three keys. K1, K2 and K3 all of having 56 bits. These keys are applying in three different variant. The encryption of<\/p>\n

    Ciphertext = EK<\/em>3<\/em> (DK<\/em>2 (EK<\/em>1<\/em> ( Plaintext) ) )<\/p>\n

    Means DES first encrypt with K1 , secondly DES decrypt with K2 and then DES encrypt with K3. The plaintext will be recovered by decrypt with K3 , encrypt with K2 then decrypt with K1.<\/p>\n

    Plaintext = DK1 (EK2 (DK3 ( Ciphertext) ) )<\/p>\n

    Each triple Des encryption encrypt one block of 64 bits of data. The TDEA offer three different variants with respect to keys.<\/p>\n