
This paper proposes Uniform Switching Identities (USWIDs) as a lightweight, collusion-resistant identity scheme designed for computationally constrained environments. USWIDs use uniformly structured identities and simplified penalization logic while retaining effectiveness comparable to classical Tardos-based methods. Through simulations, we show U-SWIDs maintain robustness even under lossy feedback conditions - common in forensic watermarking scenarios. Compared to Approximated Tardos Switching Identities (AT-SWIDs), U-SWIDs offer improved scalability, ease of generation, and operational simplicity without compromising traceability. The findings suggest U-SWIDs are a viable alternative for practical traitor tracing systems, especially where delivery, derivation cost, and resilience to partial symbol loss are critical deployment factors.
Vladimir D. Živković, Abhijeet Golwelkar, Ronald Peters, "A Practical Approach to Traitor Tracing in Environments with Lossy Feedback Channels" in Electronic Imaging, 2026, pp 310-1 - 310-7, https://doi.org/10.2352/EI.2026.38.4.MWSF-310