DDIM-Driven Coverless Steganography Scheme with Real Key

TL;DR

This paper introduces a DDIM-driven coverless steganography scheme that uses a real-key mechanism with reversible data hiding and chaotic encryption, reducing key exchange overhead and enhancing security against substitution attacks.

Contribution

It presents a novel coverless steganography method utilizing real keys, integrating RDH and chaotic encryption to improve key management and security.

Findings

Resists substitution attacks effectively

Requires only a single key negotiation for multiple communications

Reduces key exchange overhead significantly

Abstract

With the advancement of information hiding techniques, generation-based coverless steganography has emerged as an alternative to traditional methods, leveraging generative models to transform secret information into stego-objects rather than embedding it within the redundancy of the cover. However, existing generation-based approaches require pseudo-keys that must be shared between communication parties, leading to high overhead of frequent key exchanges and security risks due to their tight coupling with the secret information. This paper proposes a DDIM-driven coverless steganography scheme that utilizes a real-key mechanism, improving the key management. By integrating reversible data hiding (RDH) and chaotic encryption into generation model, the proposed method eliminates excessive key exchanges and reduces the correlation between the key and the secret information. Furthermore, it requires only a single key negotiation for multiple communication, which lowers overhead. Experimental results demonstrate that the proposed scheme resists substitution attacks, enhancing the security of covert communication.