A simple, multipurpose, efficient, sensitive and highly qualities method of image cryptography will be introduced in this research paper. The method will be easily used to encrypt-decrypt any type of image with any size (gray and color images). The proposed method will secure the image by providing a high degree of image protection based on using a complex private key, which contains eight values, each of the has a double data type. The private key will provide the required key space to resist any hacking attack. The private key components will be used to calculate the size of the generated 3D chaotic logistic key. The private key will also be used to run two chaotic logistic map models to get two different chaotic keys base on the chaotic parameters values included in the private key. Two rounds of XORing operations will be used to generate the encrypted-decrypted image. The generated outputs of the proposed method will be sensitive to the selected value of the private key. The proposed method will be very flexible, changing the source image or/and changing the private key will not require any changes in the method algorithm. The proposed method will be tested and implemented using various image, the obtained results will be discussed to prove the features provided by the method: quality, sensitivity, security and efficiency.
Multiple methods are used to hide secret messages in digital color images, and the most important and most common is the least significant bit (LSB) method. The LSB method is a known and exposed method, and anyone with programming experience can retrieve the secret message embedded in the digital image. In this paper research we will add some enhancements to improve the security level of LSB method to protect the embedded secret message from being hacked. A simple method of secret message cryptography will be used to encrypt the secret message before bedding it using LSB method. The method will be based on using color image as an image_key; this image_key will be resized to generate the needed secret private key used to encrypt-decrypt secret message. The length and the contents of the generated private key will dynamically change depending on the message length and the selected image_key. The selected image_key will be kept in secret without transmission and will be known only by the sender and receiver and it can be changed any time when needed. The proposed crypto_steganographic method will be implemented to show how it will increase the level o secret message protection.
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