I want two copies for this assignment and the word limit is 850 words and the assignment is about research study i have attached a file below please check it

In this assignment we study and analysis the four paper that are given below
1. Chaotic substitution for highly autocorrelated data in encryption algorithm
2. A Robust Watermarking Scheme for Online Multimedia Copyright Protection Using New Chaotic Map
3. A noise resistant symmetric key cryptosystem based on S8 S-boxes and chaotic maps
4. Discriminative binary feature learning and quantization in biometric key generation
These paper discuss about cryptography and their techniques
In the first paper author discuss about drawback of substitution-box in highly auto-correlated data . In this paper author proposes a novel chaotic substitution technique for image encryption algorithm to sort the problem. The proposed algorithm working for image encryption the same four gray-scale images having 256, 128, 64 and 2 (binary) gray scales. The propose algorithm result shows that is more stronger than S-box algorithm for image encryption is much stronger than most of the existing image encryption techniques and few statistical security analyses have also been done to show the strength of propose algorithm. Although the algorithm presented in this paper intents at the image substitution, it is not just limited to this area and can be widely applied in other information security fields.
2 A Robust Watermarking Scheme for Online Multimedia Copyright Protection Using New Chaotic Map
In this paper author developed a unified watermarking algorithm using three different and distinct chaotic maps in which one map is proposed in this work. The embedding of the watermark is operated by the individual chaotic sequence generated by a different chaotic map. The simulation results and security analysis confirmed that the proposed algorithm is
secure against well-known attacks. Like all new proposals, we strongly encourage the analysis of our framework before its immediate deployment. The proposed algorithm is a generalized watermarking model that can incorporate changes as required. For instance, the number of substitution boxes can be...