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《ACTA ELECTRONICA SINICA》 1995-01
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The Encryption Methods in ECPS2 and ECPS3 Are Not Secure

Long Yonghong(Department of Computer Science,Xiangtan Univesity,Hunan 411105)  
In this paper,the security problem of the encryption procedures in the public key cryptosystems ECPSZ and ECPS3 which are based on error correcting codes is discussed.It is pointed out that a permuation matrix can be found in time O(n3) from the public information of the cryptosystems,which can be used to decrypt the ciphertexts encrypted with the secret permutation matrix,where n is the mumber of rows(columns) in the secret permutaion matrix.Further,detailed procedure to attack ECPS2 is described.
【CateGory Index】: TN918.4
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【Citations】
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