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Backdoor Weakness Found in TETRA Radio Encryption Standard

🔒 Security researchers from Midnight Blue have disclosed a critical weakness in an ETSI-endorsed TETRA end-to-end encryption implementation used in professional radios. After extracting and reverse-engineering a Sepura device, they found the E2EE algorithm compresses a 128-bit key to an effective 56 bits before encryption, drastically weakening confidentiality. The behavior looks like an intentional backdoor, and it is unclear which organizations use the vulnerable implementation or whether operators are aware of the risk.