TETRA (Trans EuropeanTrunked Radio) is an open wireless digital trunking standard developed by the ETSI (ETSI). Security researchers recently found that the standard has multiple security vulnerabilities, which can expose sensitive data transmitted through the standard.

In 2000, China confirmed the adoption of the TETRA standard, which operates in the 800 MHz frequency band according to the requirements of the Ministry of Information Industry; The Ministry of Public Security of China issued the TETRA system standard for operation in the 350 MHz frequency band in June 2004.

At present, police, military, and key infrastructure institutions in multiple countries and regions around the world adopt TETRA standards. After in-depth research by researchers, they believe that these vulnerabilities have existed for decades and are specifically reserved as backdoors.

ETSI subsequently issued a statement that does not endorse the researchers' view that these vulnerabilities are not backdoors, but export controls used to determine encryption strength.

Security experts suggest that consumer grade hardware such as regular laptops can be used to decrypt radio traffic content within one minute.

Jos Wetzels, one of the researchers at cybersecurity company Midnight Blue, said, "This is clearly a deliberate back door reserved by the institution, otherwise the vulnerability cannot be made effective.

The focus of this time is mainly on the TEA 1 encryption algorithm of TETRA standard. Researchers found that historical decryption and de Data anonymization can be performed by using encryption algorithm vulnerabilities.

Midnight Blue will showcase their findings at the Black Hat Cybersecurity Conference in August.