Cryptographic system with bi-directional communication between devices by means of codes of two-dimensional images and method for secrecy and signature of digital content

摘要

Cryptographic system with bi-directional communication between devices by means of codes of two-dimensional images and method for secrecy and signature of digital content. We propose a cryptographic system of high safety and a method for encryption and signature of digital content, where the storage of secret keys and cryptographic operations occur in the environment segmented.Such an environment is composed of a device authenticator, in which processing occurs in isolated environments of safety compromised. In the system all the information traffic between the device authenticator and other computer terminals is carried out bidirectionally through codes of two-dimensional images.The system is efficient against side channel attacks automated and, having still high interoperability, which can be used with different terminals of different technologies and different operating systems, serving a diverse range of digital content, such as, for example, Cumentos of text, images, photos, files, programs, spreadsheets,Electronic mail messages (e-mail) and others.