基于唯密文数据的序列密码识别

对采用RC4、A5/1和Trivium序列密码加密的数据进行了识别研究。首先,在训练和测试样本加密密钥一致和不一致时分别进行了序列密码识别;其次,对序列密码和分组密码进行混合识别;最后,考虑了短密钥流情形下的序列密码识别。实验结果表明,即使训练和测试样本加密密钥不一致时,基于短密钥流的识别也能达到较好的识别效果,同时序列密码与3DES、Blowfish能够以较高的识别率进行混合识别。

Identification of Stream Cipher based on Pure Ciphertext Data

A research has been done to identify ciphertext data encrypted by stream cipher of RC4,A5/1 and Trivium in this paper.Firstly,these stream ciphers are identified respectively with training and testing ciphertext samples generated by the same and different keys.Then,a hybrid identification under ciphertext data of both stream and block cipher is made.At last,the identification of stream cipher based on short key stream generated by initial key is considered.The experiment results indicate that a successful identification of stream cipher based on short key stream can still be gained,though training and testing ciphertext samples are generated by different keys.In addition,a high hybrid identification rate on stream cipher together with 3DES and Blowfish is achieved.