This book constitutes the proceedings of 25th International Symposium, SSS 2023, in Jersey City, NJ, USA, in October 2023.

The 32 full papers presented together with 8 short papers were carefully reviewed and selected from 78 submissions. The conference was organized into five tracks reflecting major trends related to the conference:

(i) Track A. Self-stabilizing Systems:

Theory and Practice,

(ii) Track B. Distributed and Concurrent Computing:

Foundations, Fault-Tolerance and Scalability,

(iii) Track C. Cryptogrophy and Security,

(iv) Track D. Dynamic, Mobile and Nature-Inspired Computing Mobile

Agents,

(v) and Distributed Databases.