Encryption and Decryption of Images with Pixel Data Modification Using Hand Gesture Passcodes

To ensure data security and safeguard sensitive information in society, image encryption and decryption as well as pixel data modifications, are essential. To avoid misuse and preserve trust in our digital environment, it is crucial to use these technologies responsibly and ethically. So, to overcome some of the issues, the authors designed a way to modify pixel data that would hold the hidden information. The objective of this work is to change the pixel values in a way that can be used to store information about black and white image pixel data. Prior to encryption and decryption, by using Python we were able to construct a passcode with hand gestures in the air, then encrypt it without any data loss. It concentrates on keeping track of simply two pixel values. Thus, pixel values are slightly changed to ensure the masked image is not misleading. Considering that the RGB values are at their border values of 254, 255 the test cases of masking overcome issues with the corner values susceptibility

ALMACENAMIENTO EN LA NUBE CON SEGURIDAD ADICIONAL BASADA EN OCULTACIÓN REVERSIBLE DE DATOS (CLOUD STORAGE WITH ADDITIONAL SECURITY BASED ON REVERSIBLE DATA HIDING)

Resumen Hoy en día los servicios de almacenamiento en la nube son usados de forma masiva. Con fines de protección de la información, se ofrecen niveles de seguridad basados en protocolos de seguridad informática y de la información respectivamente, para hacer frente a diversos tipos de ataques cibernéticos. Ante este escenario, surge la necesidad de desarrollar herramientas tecnológicas que coadyuven con las ya existentes en lo que concierne a la obtención de una protección adicional. En el contexto de imágenes digitales, una de estas herramientas es la técnica de ocultamiento reversible de datos en dominio cifrado, en este sentido, el presente artículo propone un par de estas técnicas que utilizan el cifrado de flujo AES y RC4 como dominios de inserción, este último combinado con mezcla caótica. Los resultados experimentales muestran su efectividad en escenarios reales de operación, garantizando la integridad de datos y al mismo tiempo no interfiere con los protocolos de seguridad de los servicios en la nube. Palabras Clave: Cifrado de flujo, mezcla caótica, ocultamiento reversible de datos en dominio cifrado, servicios de almacenamiento en la nube. Abstract Nowadays cloud storage services are used in a massive way. To protect the information in them and to face different types of cyber-attacks that could violate, and compromise stored data, they offer specific levels of security and information security protocols. In this scenario, there is an urgent need to develop technological tools that contribute to those one already developed and to offer additional protection. In the context of digital images, one of these tools is the reversible data hiding technique in the encrypted domain. In this article two techniques are being proposed that use stream encryption as the insertion domain, one of them combined with chaotic mixing. The experimental results are subject to real operational problems, guaranteeing the integrity of the data and at the same time without interfering with the security protocols used in the cloud services. Keywords: chaotic mixing, cloud storage services, reversible data hiding in encrypted domain, stream cipher