A mechanism of quantitating the security strength of RSA key

RSA algorithm is applied in a wide field of information security, its security has withstood decades of challenges. But the security of key is different from the security of algorithm, which is often ignored by most of professionals. In most implementations, they lack legible recognition to the safety of the RSA key, so that even the introduction of some strong crypto-algorithms still leads to some security matters. In this paper, against the known plaintext attack to RSA public key crypto scheme, to the quantization of the RSA key security strength as the center, the concept of key security coefficient, the evaluation model of security coefficient and the algorithm to extract security strength are initiated, in addition, an improved method to generate secure keys is designed. Some experiments are operated on the platform of high performance computation Cluster, and the time performance of key and distribution of key-amount to key security coefficient is analyzed and summarized thoroughly. The experiment data demonstrated that our mechanism be able to improve the security of RSA.