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Figure 1.16: Decrypted the Image. Step3: To decrypt the Image, we simply take the encrypted Image using a chaotic algorithm. This yields the original Image, as shown in figure (1.16).

Figure 1 16: Decrypted the Image. Step3: To decrypt the Image, we simply take the encrypted Image using a chaotic algorithm. This yields the original Image, as shown in figure (1.16).

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With regard to symmetric cryptography, just one key is utilized for decryption and encryption. As displayed in Figure (1.1), the sender is using a key and the algorithm to encrypt the plaintext and sends the ciphertext to the recipient. The recipient employs the same algorithm and key for decrypting the message and recovers the plaintext. By this kind of cryptography, it is observable that the key should be known to the sender and receiver. An example about this cryptography is DES [14]. Symmetric Cryptography can be classified according to the treating way of encrypting a plaintext into the following two types:
With regard to symmetric cryptography, just one key is utilized for decryption and encryption. As displayed in Figure (1.1), the sender is using a key and the algorithm to encrypt the plaintext and sends the ciphertext to the recipient. The recipient employs the same algorithm and key for decrypting the message and recovers the plaintext. By this kind of cryptography, it is observable that the key should be known to the sender and receiver. An example about this cryptography is DES [14]. Symmetric Cryptography can be classified according to the treating way of encrypting a plaintext into the following two types:
b. Block cipher: - In a block cipher shown in Figure (1.3), a message is split into a number of blocks, for example, a block with 128-bits length in the AES algorithm or a block length of 64-bits in DES algorithm, and after that each one of the plaintext bit block is transformed into the encrypted block related to cipher bits via a key and algorithm [15].
b. Block cipher: - In a block cipher shown in Figure (1.3), a message is split into a number of blocks, for example, a block with 128-bits length in the AES algorithm or a block length of 64-bits in DES algorithm, and after that each one of the plaintext bit block is transformed into the encrypted block related to cipher bits via a key and algorithm [15].
nternational Journal of Engineering Research And Advanced Technology, Vol.7 (4), April -2
nternational Journal of Engineering Research And Advanced Technology, Vol.7 (4), April -2
In 1976, a totally different type of encryption was produced by Whitfield Diffie, Ralph Merkle, and Martin Hellman. Asymmetric cipher is also called public-key cryptography. In asymmetric cryptography shown in Figure (1.4), the encryption and decryption will be done by two different keys, where just the data which was encrypted via the public key might be decrypted via an identical algorithm and the data that was encrypted via a private key is decrypted by only the same public key. The most known public-key encryption algorithm is the RSA algorithm [16]. 4. Chaotic Algorithm
In 1976, a totally different type of encryption was produced by Whitfield Diffie, Ralph Merkle, and Martin Hellman. Asymmetric cipher is also called public-key cryptography. In asymmetric cryptography shown in Figure (1.4), the encryption and decryption will be done by two different keys, where just the data which was encrypted via the public key might be decrypted via an identical algorithm and the data that was encrypted via a private key is decrypted by only the same public key. The most known public-key encryption algorithm is the RSA algorithm [16]. 4. Chaotic Algorithm
Figure 1.5: Chaos iterative function. Chaos theory is a branch of non-linear dynamic systems. These dynamic systems with low dimensions have the potential for complex and unpredictable behavior. Here the complexity of determining equations from the source is not a prerequisite for generating random sequences. The short, chaotic system is an overlap between rigid order and unpredictability Probability as described in figure (1.5) Chaos iterative function.
Figure 1.5: Chaos iterative function. Chaos theory is a branch of non-linear dynamic systems. These dynamic systems with low dimensions have the potential for complex and unpredictable behavior. Here the complexity of determining equations from the source is not a prerequisite for generating random sequences. The short, chaotic system is an overlap between rigid order and unpredictability Probability as described in figure (1.5) Chaos iterative function.
4.1.2 Hénon Map
4.1.2 Hénon Map
form of a flying butterfly flipping its wings. Thus, it coins the term “Butterfly Effect” [19]. 4.2 Chaos and Cryptography
form of a flying butterfly flipping its wings. Thus, it coins the term “Butterfly Effect” [19]. 4.2 Chaos and Cryptography
4.1.3 Lorenz System A professor in MIT, Edward N. Lorenz, introduced the first chaotic system developed via 3-D autonomous equations referred to as Lorenz equation, as can be seen in the equation (3), in his study of weather modeling in 1963 and the chaotic attractor it generates is commonly known as Butterfly Effect .
4.1.3 Lorenz System A professor in MIT, Edward N. Lorenz, introduced the first chaotic system developed via 3-D autonomous equations referred to as Lorenz equation, as can be seen in the equation (3), in his study of weather modeling in 1963 and the chaotic attractor it generates is commonly known as Butterfly Effect .
6. The Suggested Technique for Encryption and Decryption Image 5. PROPOSED METHOD ARCHITECTURE This section will illustrate the proposed method for encryption and decryption images. As can be seen in Figure (1.11) and Figure (1.12) of the General Algorithm. In 1989, Matthews, a British mathematician, firstly employed chaos for encryption, suggesting a novel encryption algorithm generating key streams on the basis of Logistic map and encrypting the information by stream cipher method [21]. In 1998, Fridrich Scharinger suggested the first chaos-based image encryption algorithm with diffusion and confusion design, which were two significant characteristics of a secure cipher as indicated via Claude Shannon in his masterwork “Communication Hypothesis of Secrecy Systems” [22].
6. The Suggested Technique for Encryption and Decryption Image 5. PROPOSED METHOD ARCHITECTURE This section will illustrate the proposed method for encryption and decryption images. As can be seen in Figure (1.11) and Figure (1.12) of the General Algorithm. In 1989, Matthews, a British mathematician, firstly employed chaos for encryption, suggesting a novel encryption algorithm generating key streams on the basis of Logistic map and encrypting the information by stream cipher method [21]. In 1998, Fridrich Scharinger suggested the first chaos-based image encryption algorithm with diffusion and confusion design, which were two significant characteristics of a secure cipher as indicated via Claude Shannon in his masterwork “Communication Hypothesis of Secrecy Systems” [22].
Figure 1.9: Encrypted Image Process.
Figure 1.9: Encrypted Image Process.
Step1: Choose the loaded by the user encryption as shown in Figure (1.14).
Step1: Choose the loaded by the user encryption as shown in Figure (1.14).
Figure 1.15: Encrypted Image using XOR Methoc ternational Journal of Engineering Research And Advanced Technology, Vol.7 (4), April -2¢
Figure 1.15: Encrypted Image using XOR Methoc ternational Journal of Engineering Research And Advanced Technology, Vol.7 (4), April -2¢
Figure 1.17: Histogram for the Image In figure (1.18) will show other examples from Image for encryption and decryption based on the chaotic algorithm.
Figure 1.17: Histogram for the Image In figure (1.18) will show other examples from Image for encryption and decryption based on the chaotic algorithm.
Table (1.1): Shows the quality measures for the images after application (PSNR & MES) measures. ACKNOWLEDGMENT
Table (1.1): Shows the quality measures for the images after application (PSNR & MES) measures. ACKNOWLEDGMENT
Figure 1.18: Encryption and Decrypted Images
Figure 1.18: Encryption and Decrypted Images