The fast development of communication and technology has created new challenges to transfer data securely. The techniques widely used to secure the data are cryptography and steganography. This paper presents a video steganography method to secure the information to be transmitted. Information transmitted can be an image, audio, text or video. This article presents a new technique that embeds data in the spatial domain of the cover video frame. The method employs chaotic maps to generate Random Positions (RP) to hide the information bits, random numbers for selecting the frames at which the information to be hidden and confusion order to encrypt the cover frame. The video frame is first selected based on Frame Selection (FS) is encrypted by applying Confusion Order (CO) and then embedding is carried out on the random positions generated. After embedding, the decrypted cover frame is replaced in a video sequence for transmission. This method provides three-level security in extracting the hidden secret information and also 25% of embedding capacity. Experimental outcomes (PSNR and payload) confirm that the method is competent.
相似文献
Real-time multimedia applications are increasingly achieving success in the everyday world. Thereby, multimedia information relies on security to protect private life. The Advanced Encryption Standard (AES) has been designed to secure different applications. Yet, some limitations are given, making it inappropriate for secure video storation and transmission. The limitations are the time complexity, the multiple iterations, and the predefined substitution box. Thus, any user can use it to break the encryption. Moreover, the multiple iterations augment the need for CPU usage, and so the overall run time. Hence, it is necessary to modify the AES algorithm to make it more appropriate for securing video frames transmission over insecure channel. In this paper, an Improved AES (IAES) is put forward, which improves both diffusion and confusion in ciphered video. Our work consists in the following two main points: First, we propose to eliminate both shift-row and sub-byte transformations and replace them with a mix-row operation. This task reduces the run time, which presents a significant factor for real-time video transmission. Equally important, we propose to use the henon chaotic map in the key generation procedure, which provides more randomness. The Hash Algorithm SHA-3 is used to generate the initial conditions of the chaotic attractor. The video encryption procedure is verified with success, and the experimental results confirm that the novel algorithm combining chaos and IAES augments the entropy of the ciphered video by 15% and reduces the complexity time for both encryption and decryption compared to the standard one. Security analysis is successfully performed, and the results prove that our suggested technique provides the basics of cryptography with more correctness. The PRNG is tested by NIST 800–22 test suit, which indicates that it is suitable for secure image encryption. It provides a large key space of 2128 which resists the brute-force attack. All in all, the findings confirm that the novel security approach eliminates the limitation of the existing AES and provides a trade-off between speed and safety levels to secure video transmission.
相似文献Mixed Reality (MR) surgery has not been effectively implemented in telemedicine due to strict requirements of security and delay minimization during real-time video transmission. Hence, this paper aims to propose a novel solution for Surgical Telepresence with highly secured and faster real-time video transmission. The proposed system consists of three components: Authentication (Pre-surgery), Data transmission (During-Surgery), and Storage (Post-Surgery). For Authentication, Pass-Matrix technique is used at both ends to provide graphical passwords. During the surgery, a hybrid system is used to provide highly secured and faster real-time video transmission. This system includes a Feistel Encryption System (FES), Modified Scaled Zhongtang Chaotic System (M-SCZS), and Modified Advanced Encryption System (M-AES) algorithm. After Surgery, the transmitted data are stored using the Information Accountability Framework (IAF) for future purposes. The results are obtained from the during-surgery stage for jaw, breast, and bowel surgery. Both solutions are simulated in MATLAB on a personal computer with average processing capability. The proposed solution improves the entropy from 7.733~7.782 to 7.798–7.996 and reduces the processing time from 8.642~9.911 s/frames to 5.071~6.563 s/frames. The proposed focus on reducing the total processing time for the encryption and decryption process with improving security during the surgery process. Finally, this solution provides a fast security system for surgical telepresence that helps both local and remote surgeons for secure real-time communication. The complexity for this work need to know the used chaotic method, the values of the chaotic parameters and for which this method was used, in addition to the complexity of state of the art.
相似文献Data hiding in video is a method used to hide secret information within the video which is useful for secure multimedia data communication. The main goal of any video steganographic system is to reduce distortion of video and to secure the embedded data. A novel approach of hiding data using Oppositional Grey Wolf Optimization (OGWO) is proposed to minimize distortion and to enhance security so as to get superior video quality. In this work, scene changes are used to identify the key frames to hide the secret data. The scene changes are detected using Discrete Cosine Transform (DCT). Once the key frames are detected, OGWO is used at this stage to select the optimal region to embed the secret data. Lastly, the optimal region for entrenching is construed to embed the secret data using Discrete Wavelet Transform (DWT). Then, the payload and video are normalized using Inverse DWT to boost the video quality. The performance of the proposed system is measured using Peak Signal to Noise Ratio (PSNR), Embedding Capacity and Normalized Correlation (NC). The comparison results show that the proposed method delivers more security and minimizes distortions for improved video quality.
相似文献The Secret Sharing Scheme plays a vital role in cryptography which allows to transmit the secret digital information (image, video, audio, handwriting, etc.,) over a communication channel. This cryptographic technique involves encrypting the secret images into noisy shares and transmitted. The transmitted image shares are reconstructed using simple logical computation. In this paper, we propose a secure (n, n)- Multi-Secret-Sharing (MSS) scheme using image scrambling algorithm which is based on the logistic chaotic sequence generated using the secret key which is retrieved from the geometric pattern named as spirograph which drawn by the users with their private values. Also, decomposition and recombination of image pixels which points to change the position and values of the pixels. The experimental results estimate that the standard metrics NPCR, UACI, Entropy, Coefficient Correlation values proves the rigidness of the implemented algorithm.
相似文献In order to obtain a more secure and effective image encryption scheme, a color image encryption scheme based on Fisher-Yates scrambling algorithm and chaos theory is proposed. First, the (secure hash algorithm) SHA-384 is used to generate the key by combining the plaintext image and the encrypted time point. Then, three groups of chaotic sequences are obtained by iterating the three-dimensional Chen chaotic system, and three groups of pseudo-random sequences are obtained by processing with the key. The first group of pseudo-random sequences combined with the Fisher’s algorithm for image pixel position scrambling. A new pixel value substitution method is proposed using the second group of sequences to control each pixel value substitution of the image. The last group generated the matrix after pixel substitution was used for diffusion transformation to obtain the final encrypted image. The test results show that the scheme has broad application prospects.
相似文献In this paper, a new image encryption algorithm is introduced for encrypting grayscale digital images of any size. To improve the encryption evaluation parameters, we suggested that the value of the plain image correlation coefficient be effective in the cryptographic process, so plain images with different properties and correlation coefficient rates are encrypted in different ways. According to the average absolute value of correlation coefficient of plain image, Logistic or Tent maps is selected to generate chaotic sequences to expand plain image matrix. As the first step of the diffusion phase, the plain image matrix is developed with larger size by proper selected chaotic sequences, and simultaneously a chaotic matrix with the same size is generated by chaotic Sine map sequences. In confusion phase, the modified Lorenz map changes pixel locations of new developed matrix by means of certain equations. Then bitwise XOR is applied between developed matrix include plain image and Sine map chaotic matrix, as second step of diffusion phase. Finally, encrypted image is generated after applying exchange operations on the content of pixels, as third step of diffusion phase. Experimental results and comparisons with some of the existing methods, show that the proposed image cryptosystem is able to resist common cryptanalytic attacks and can be used as a secure method for encrypting digital images.
相似文献Multimedia data such as: images, audio and video have become significantly more important, since the exchange of digital data over the network (wired/wireless) has expanded. Therefore an increasing need to secure the important data many techniques are used to such purpose. Cryptography remains an important and wide used mean to secure data. In this aim we propose a new rapid hyperchaotic system with higher confusion and a unique equilibrium point. Detailed mathematical study based on dynamic tests such as lyapunov exponents, Poincare map, the Lyapunov Dimension computing, Dissipation and the study of an attractor existence. In addition an electronic implementation is realized to simulate the attractor behavior. The developed system is injected in a new proposed encryption algorithm to introduce high randomness and hyperchaotic behavior to its output applied on digital images. Tests and simulation results on many images kinds prove the efficiency and higher velocity of processing time of the proposed algorithm.
相似文献This paper uses a combination of a logistic map and a five-term chaotic oscillator to develop a secure speech communication technique. Firstly, an active controller is designed to synchronize the five terms chaotic oscillators at the transmitter and receiver sides. Then, the first encryption level of row-column shift and a bit XOR operation are performed using the chaotic oscillator. It is followed by a bit-level permutation using the combined key, generated by the chaotic oscillator and the logistic map to enhance the security. Various security analysis methods, such as spectrogram analysis, histogram analysis, correlation test, periodogram analysis, SNR analysis, etc. are used to assess the claim of higher security made in this paper. The simulation results confirm that the proposed technique is more secured than some similar available techniques. The proposed technique’s ability to resist various attacks is tested and found to have adequate resistance to various attacks.
相似文献