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ETSI TETRA TAA TEA ← TEA3
TETRA Encryption Algorithm 4
TEA4, short for TETRA Encryption Algorithm 4, 1 is a
stream cipher associated with
Terrestrial Trunked Radio (TETRA), a
European standard for public and emergency services, standardized
by the European Telecommunications Standards Institute (ETSI).
Like the TEA1 algorithm it is intended for commercial use and
restricted export. Although the structure of the cipher is still
unknown, it is likely that it has weaknesses similar to TEA1 by design.
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In July 2023, Dutch cyber security firm
Midnight Blue revealed that it had
managed to extract, isolate and analyse the TEA1, TEA2 and TEA3
algorithms from a working TETRA radio as part of its
TETRA:BURST research project.
Unfortunately, no TEA4 firmware was available
at the time, although other vulnerabilities in the TETRA protocol suite
were identified [2][4].
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Not to be confused with Tiny Encryption Algorithm.
➤ Wikipedia
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As part of the TETRA:BURST project,
Midnight Blue researchers managed to
extract and reverse-engineer the firmware from an operational TETRA radio,
and construct an equivalent of the code in the C programming language.
This source code is now available to researchers [II].
Note that the source code of TEA4 is not included as its firmware
was not available to the researchers.
➤ Download the full source code
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© Crypto Museum. Created: Wednesday 09 August 2023. Last changed: Saturday, 12 August 2023 - 14:04 CET.
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