Identity authentication is the first line of defense for network security.Passwords have been the most widely used authentication method in recent years.Although there are security risks in passwords,they will be the ...Identity authentication is the first line of defense for network security.Passwords have been the most widely used authentication method in recent years.Although there are security risks in passwords,they will be the primary method in the future due to their simplicity and low cost.Considering the security and usability of passwords,we propose AvoidPwd,which is a novel mnemonic password generation strategy that is based on keyboard transformation.AvoidPwd helps users customize a“route”to bypass an“obstacle”and choose the characters on the“route”as the final password.The“obstacle”is a certain word using any language and the keys adjacent to the“obstacle”are typed with the“Shift”key.A two-part experiment was conducted to examine the memorability and security of the AvoidPwd strategy with other three password strategies and three leaked password sets.The results showed that the passwords generated by the AvoidPwd strategy were more secure than the other leaked password sets.Meanwhile,AvoidPwd outperformed the KbCg,SpIns,and Alphapwd in balancing security and usability.In addition,there are more symbols in the character distribution of AvoidPwd than the other strategies.AvoidPwd is hopeful to solve the security problem that people are difficult to remember symbols and they tend to input letters and digits when creating passwords.展开更多
With the advancement in internet technologies, the number of servers has increased remarkably to provide more services to the end users. These services are provided over the public channels, which are insecure and sus...With the advancement in internet technologies, the number of servers has increased remarkably to provide more services to the end users. These services are provided over the public channels, which are insecure and susceptible to interception, modification, and deletion. To provide security, registered entities are authenticated and then a session key is established between them to communicate securely. The conventional schemes anow a user to access services only after their independent registration with each desired server in a multiserver system. Therefore, a user must possess multiple smartcards and memorize various identities and passwords for obtaining services from multiple servers. This has led to the adoption of multiserver authentication in which a user accesses services of multiple servers after registering himself at only one central authority. Recently, Kumar and Om discussed a scheme for multiserver environment by using smartcard. Since the user-memorized passwords are of low entropy, it is possible for an attacker to guess them. This paper uses biometric information of user to enhance the security of the scheme by Kumar and Ore. Moreover, we conducted rigorous security analyses （informal and formal） in this study to prove the security of the proposed scheme against all known attacks. We also simulated our scheme by using the automated tool, ProVerif, to prove its secrecy and authentication properties. A comparative study of the proposed scheme with the existing related schemes shows its effectiveness.展开更多
基金supported in part by the National Natural Science Foundation of China (No. 61803149 and No. 61977021)in part by the Technology Innovation Special Program of Hubei Province (No. 2020AEA008)in part by the Hubei Province Project of Key Research Institute of Humanities and Social Sciences at Universities (Research Center of Information Management for Performance Evaluation)
文摘Identity authentication is the first line of defense for network security.Passwords have been the most widely used authentication method in recent years.Although there are security risks in passwords,they will be the primary method in the future due to their simplicity and low cost.Considering the security and usability of passwords,we propose AvoidPwd,which is a novel mnemonic password generation strategy that is based on keyboard transformation.AvoidPwd helps users customize a“route”to bypass an“obstacle”and choose the characters on the“route”as the final password.The“obstacle”is a certain word using any language and the keys adjacent to the“obstacle”are typed with the“Shift”key.A two-part experiment was conducted to examine the memorability and security of the AvoidPwd strategy with other three password strategies and three leaked password sets.The results showed that the passwords generated by the AvoidPwd strategy were more secure than the other leaked password sets.Meanwhile,AvoidPwd outperformed the KbCg,SpIns,and Alphapwd in balancing security and usability.In addition,there are more symbols in the character distribution of AvoidPwd than the other strategies.AvoidPwd is hopeful to solve the security problem that people are difficult to remember symbols and they tend to input letters and digits when creating passwords.
文摘With the advancement in internet technologies, the number of servers has increased remarkably to provide more services to the end users. These services are provided over the public channels, which are insecure and susceptible to interception, modification, and deletion. To provide security, registered entities are authenticated and then a session key is established between them to communicate securely. The conventional schemes anow a user to access services only after their independent registration with each desired server in a multiserver system. Therefore, a user must possess multiple smartcards and memorize various identities and passwords for obtaining services from multiple servers. This has led to the adoption of multiserver authentication in which a user accesses services of multiple servers after registering himself at only one central authority. Recently, Kumar and Om discussed a scheme for multiserver environment by using smartcard. Since the user-memorized passwords are of low entropy, it is possible for an attacker to guess them. This paper uses biometric information of user to enhance the security of the scheme by Kumar and Ore. Moreover, we conducted rigorous security analyses （informal and formal） in this study to prove the security of the proposed scheme against all known attacks. We also simulated our scheme by using the automated tool, ProVerif, to prove its secrecy and authentication properties. A comparative study of the proposed scheme with the existing related schemes shows its effectiveness.
