With the rapid development of the Internet,especially network banking and e-commerce,the cyber security problem is becoming particularly important in the process of network transmission.Open SSL is the implementation of SSL protocol,which can be used to ensure the data integrity and confidentiality of bilateral communication and authenticate.Open SSL has weak defense against side channel attacks.The data samples of encrypting time of seven grouped encryption algorithms in Open SSL encryption algorithm library are statistically analyzed.Finally the minimum sample size required for valid attack ...