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Cybersecurity researchers have discovered a fresh set of security issues in the Terrestrial Trunked Radio (TETRA) communications protocol, including in its proprietary end-to-end encryption (E2EE) mechanism that exposes the system to replay and brute-force attacks, and even decrypt encrypted traffic

The Hacker News 12 Aug 2025, 4:32 a.m. Black Hat Brute Force Encryption Flaw Research Vulnerability