In [1] a Niederreiter-type public-key cryptosystem based on subcodes of generalized Reed-Solomon codes is presented. In this
paper an algorithm is proposed which is able to recover the private key of the aforementioned system from the public key and
which is considerably faster than a brute force attack. It is shown that the example parameters proposed in [1] are insecure.
Keywords Public key cryptography - McEliece encryption - Niederreiter encryption - error-correcting codes - generalized Reed-Solomon codes - Sidelnikov-Shestakov attack