Secure Image Encryption Technique Using Blowfish And Chaos

Security

This paper focuses mainly on the different kinds of image encryption and decryption techniques. In addition focuses on image encryption techniques. In this paper mainly focuses on two techniques like that blowfish and chaos. Security has always been a great concern whenever there is communication between sender and receiver. To overcome the issues of security breaches many cryptographic algorithms are used like: aes, des, blowfish etc. Blowfish algorithm more compact and more secure compare to aes algorithm. Blowfish algorithm is a symmetric block cipher with a 64-bit block size and variable key lengths from 32 bits up to a maximum of 448 bits.Blowfish is a secret symmetric key that has only a single key, used both for encryption and decryption. The algorithm consists of two parts. One is a Key-expansion part and one more is a data-encryption part. The blowfish uses a large number of sub keys. Blowfish is one of the fastest block ciphers in general use, expect when changing keys. chaos has been widely used for image encryption for its different features. There are many chaos based encryption techniques. Chaos used for expand diffusion & confusion in image. Most of the proposed discrete chaotic cryptographic approaches are based on stream or block cipher schemes. Chaos-based cryptography is a promising and emerging field that offers a large variety of techniques particularly suitable for applications such as image encryption. The fundamental characteristics of chaotic systems are closely related to the properties of a strong cryptosystem. Most research on chaos-based encryption does not concentrate on the aspect of encryption modes of operation.

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