Security researchers discovered that end-to-end encryption algorithms used in TETRA radio systems have critical vulnerabilities. The encryption starts with 128-bit keys but gets compressed to 56 bits, making it vulnerable to cracking. This affects radios used by police, military, and intelligence agencies worldwide. The researchers also found flaws allowing message injection and replay attacks. While the encryption was designed to address previous TETRA vulnerabilities, it introduces new security risks that may not be transparent to end users.
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