40-bit encryption

About: 40-bit encryption is a research topic. Over the lifetime, 5434 publications have been published within this topic receiving 149016 citations.

Cryptanalysis of a new image alternate encryption algorithm based on chaotic map

Abstract: Wang and Guo (Nonlinear Dyn 76(4):1943–1950, 2014) proposed a new image alternate encryption algorithm based on chaotic map. The image alternate encryption can be conceptually treated as a block cipher where a round function which provides both confusion and diffusion is applied on a plain image iteratively. After performing the round function for \(T\) iterations, the processed image is denoted as the encrypted image. We analyse the security of Wang and Guo image encryption scheme, especially from cryptographic point of view, in line with the designers’ approach in their security analyses. Negatively, we show that the image encryption scheme is vulnerable to an impossible differential attack (a type of chosen plaintext attack) and a divide-and-conquer attack when a large all black image is encrypted. This paper serves as another important security result showing that any future design of image encryption schemes based on chaotic map should be evaluated through systematic cryptanalytic approaches which include impossible differential attack. To the best of our knowledge, this is the first impossible differential attack applied on an image encryption algorithm.

System and methods for secure digital data archiving and access auditing

Abstract: On an archive server, a secure storage control layer is interposed in the archive data stream between an archiving application and a storage device driver The secure storage control layer includes an encryption engine providing for two-level cipher processing of data segments transported by the stream A secure policy controller is coupled to the secure storage control layer and, responsive to identifying information obtained from the stream, retrieves a group of encryption keys from a secure storage repository to enable the encryption engine to selectively encrypt data segments or a single encryption key conditionally enabling the encryption engine to decrypt select data segments For both encryption and decryption, the integrity of the stream is maintained allowing operation of the secure storage control layer to be functionally transparent to the archiving application and storage device driver

Privacy-preserving data aggregation using homomorphic encryption

Abstract: A method and system for collecting data from devices using a homomorphic encryption of the data is provided. A collection system of a device adds contributions to homomorphically encrypted data and forwards the requests to another device. When the device receives a reply to the request, it uncombines its contribution to the homomorphic encryption of the data. The device then forwards the reply to the previous device. The initiator device ultimately removes its contribution to the encryption and identifies the data.

An Improved Secure Image Encryption Algorithm Based on Rubik's Cube Principle and Digital Chaotic Cipher

Abstract: A recently proposed secure image encryption scheme has drawn attention to the limited security offered by chaos-based image encryption schemes (mainly due to their relatively small key space) proposing a highly robust approach, based on Rubik's cube principle. This paper aims to study a newly designed image cryptosystem that uses the Rubik's cube principle in conjunction with a digital chaotic cipher. Thus, the original image is shuffled on Rubik's cube principle (due to its proven confusion properties), and then XOR operator is applied to rows and columns of the scrambled image using a chaos-based cipher (due to its proven diffusion properties). Finally, the experimental results and security analysis show that the newly proposed image encryption scheme not only can achieve good encryption and perfect hiding ability but also can resist any cryptanalytic attacks (e.g., exhaustive attack, differential attack, statistical attack, etc.).