Satellite phone communications can be decrypted in near real-time

Satellite phone communications encrypted with the GMR-2 cipher can be decrypted in mere fractions of a second, two Chinese researchers have proved. The vulnerable cipher The GMR-2 is a stream cipher with 64-bit key-length. “Generally speaking, stream ciphers firstly generate keystreams by implementing a series of complex cryptographic transformation on the initial vectors and the encryption-key, and then XOR the keystreams with plaintexts to obtain the ciphertexts. Therefore, to resist known plaintext attack, a vital … More

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