Secure Medical Data Encryption Model using Hybrid Algorithms and DWT with CAPTCHA for Authentication

Secure Medical Data Encryption Model using Hybrid Algorithms and DWT with CAPTCHA for Authentication

Mrs. T Madhavi Kumari ¹, CH Nirender²

¹(ECE, JNTUH College of Engineering Hyderabad, India)

²(ECE, JNTUH College of Engineering Hyderabad, India)

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Abstract – Information is often transmitted in this modern era through various networks. Steganography is used to increase the security of messages sent over the internet. The information requires high-security levels to prevent misusing and unauthorized access. There are several Encryption Techniques that are used to achieve information confidentiality; this paper presents a newer approach to authentication. and Encryption. In this paper, we propose a receiver authentication technique and data encryption method. Initially, a CAPTCHA is generated and encrypted. The encrypted CAPTCHA is hidden in a digital image using Steganography. This image is transmitted to the intended receiver. The Received image is extracted and decrypted on the receiver side. Thus, the obtained CAPTCHA is verified with the sender CAPTCHA for authentication. After authentication, the information that is needed to be transmitted is encrypted using a Hybrid AES-RSA encryption algorithm, and the encrypted information is stored in a Medical based image using 3-level 2D-DWT steganography and the obtained stegano image is transmitted on the authenticated channel. At the receiver, the encrypted data is extracted from the stegano image by performing 2D-DWT again. The extracted cipher data is decrypted using the Hybrid AES-RSA decryption algorithm to get the original transmitted information.

Key Words:  CAPTCHA, Encryption, AES, RSA DWT and Steganography.