• Journal of the Korea Computer Industry Society
• /
• v.7 no.4
• /
• pp.271-280
• /
• 2006

This study is to propose and design a protocol that offers independent authentication with no necessity of certification authority using password between participants in RS_RCCS(Relay Service-based Remote Computing Control System). In RS_RCCS without authentication center that remote service requesters have mutual authentication with many service managers, there needs for a protocol protected from password attacks. Hereupon, this study is to offer an efficient authentication setting and a protocol for RS_RCCS and helpful for the usefulness of resource management.

• Journal of the Korea Society of Computer and Information
• /
• v.14 no.3
• /
• pp.133-138
• /
• 2009

Recently Lin et al. proposed the remote user authentication scheme using smart cards. But the proposed scheme has not been satisfied security requirements considering in the user authentication scheme using the password based smart card. In this paper, we showed that he can get the user's password using the off-line password guessing attack on the scheme when the adversary steals the user's smart card and extracts the information in the smart card. Also, we proposed the seven security requirements for evaluating remote user authentication schemes using smart card. As a result of analysis, in Lin et al's scheme we have found the deficiencies of security requirements. So we suggest the improved scheme, the mutual authentication scheme that does not store the user's password verifier in server and can authenticate each other at the same time between the user and server.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.44 no.5
• /
• pp.54-62
• /
• 2007

We propose a novel authentication protocol for wireless mesh network. The proposed authentication protocol is based on the password scheme for convenience of users. The proposed protocol is evaluated through three analyses. The correctness of the proposed protocol is proved using the GNY analysis. By the security analysis, we show that the proposed protocol is resistant to various attacks. For the performance analysis, we implemented the protocol in Linux operating system based laptop and measured the transmission time. The analytic results show that the proposed protocol provides the secure wireless mesh network without considerable performance degradation.

• Journal of information and communication convergence engineering
• /
• v.7 no.3
• /
• pp.340-344
• /
• 2009

Multi-server password authentication schemes enable remote users to obtain service from multiple servers with single password without separately registering to each server. In 2007, Hu-Niu-Yang proposed an improved efficient password authenticated key agreement scheme for multi-server architecture based on Chang-Lee's scheme proposed in 2004. This scheme is claimed to be more efficient and is able to overcome a few existing deficiencies in Chang-Lee's scheme. However, we find false claim of forward secrecy property and some potential threats such as offline dictionary attack, key-compromise attack, and poor reparability in their scheme. In this paper, we will discuss these issues in depth.

• Journal of Korea Multimedia Society
• /
• v.25 no.9
• /
• pp.1284-1290
• /
• 2022

An attacker with a malicious purpose can intentionally type other users' accounts and passwords, causing them to be locked or revoked. Although NIST introduced methods to prevent this attack, all suggested methods are inappropriate to prevent an attacker from manually failing authentication, and reduce user availability. In this paper, in order to prevent user account lockout due to an attacker's intentional authentication failure, we propose a new authentication method using IP address and number of failed authentication. The proposed method not only blocks attackers who intentionally try to fail authentication, but also provides convenience to users because accounts are not locked or revoked. It can also safely protect passwords against password cracking attacks.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 2003.12a
• /
• pp.198-204
• /
• 2003

지금까지 제안된 패스워드를 이용하는 인증 프로토콜은 오프라인 추측 공격이나 패스워드 파일 컴프로마이즈에 대하여 안전하지 않으므로 이에 대한 연구가 요구되고 있다. 본 논문에서는 패스워드를 이용하는 인증 프로토콜인 스키마 PAP(Password based Authentication Protocol)을 적용하여 새로운 인증 프로토콜 PAPRSA를 제안하였다. PAP는 패스워드를 표현하는 많은 값들 중에서 임의로 선택한 한 값을 처리하는 것을 특징으로 한다. PAPRSA는 패스워드를 표현하는 값을 처리하기 위하여 RSA를 이용하는 PAP기반 인중 프로토콜이다. 제안된 PAPRSA는 오프라인 추측 공격과 패스워드 파일 컴프로마이즈를 포함한 공격들로부터 안전하였으며, 패스 수와 계산량을 측정한 결과 효율성 면에서 매우 우수하였다.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.2
• /
• pp.183-191
• /
• 2011

Recently Wang-Li proposed the remote user authentication scheme using smart cards. But the proposed scheme has not been satisfied security requirements considering in the user authentication scheme using the password based smart card. In this paper, we described the Wang-Li and Yoon et al.'s authentication scheme simply, and we prove that the Wang-Li's scheme is vulnerable to a password guessing attack and impersonation attack in case that the attacker steals the user's smart card and extracts the information in the smart card. Accordingly, we propose the improved user authentication scheme based on the hash function and generalized ElGamal signature scheme that can withstand many possible attacks including a password guessing attack, impersonation attack and replay attack, and that can offer the function of forward secrecy. The result of comparative analysis, the our proposed scheme is much more secure and efficient than the Wang-Li and Yoon et al.'s scheme.

• Journal of Korea Society of Industrial Information Systems
• /
• v.15 no.3
• /
• pp.33-40
• /
• 2010

Recently Yoon et al. proposed the remote user authentication scheme using smart cards. But their scheme has not satisfied security requirements which should be considered in the user authentication scheme using the password based smart card. In this paper, we prove that Yoon et al.'s scheme is vulnerable to a password guessing attack in case that the attacker steals the user's smart card and extracts the information from the smart card. Accordingly, we propose the improved user authentication scheme based on the hash function and random nonce that can withstand various possible attacks including a password guessing attack. The result of comparative analysis demonstrates that the our proposed scheme is much more secure and efficient than the Yoon et al.'s scheme, with a trivial trade-off to require just a few more exclusive-OR operations.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.9 no.12
• /
• pp.5135-5149
• /
• 2015

Communications among multi-party must be fast, cost effective and secure. Today's computing environments such as internet conference, multi-user games and many more applications involve multi-party. All participants together establish a common session key to enable multi-party and secure exchange of messages. Multi-party password-based authenticated key exchange scheme allows users to communicate securely over an insecure network by using easy-to-remember password. Kwon et al. proposed a practical three-party password-based authenticated key exchange (3-PAKE) scheme to allow two users to establish a session key through a server without pre-sharing a password between users. However, Kwon et al.'s scheme cannot meet the security requirements of key authentication, key confirmation and anonymity. In this paper, we present a novel, simple and efficient multi-party password-based authenticated key exchange (M-PAKE) scheme based on the elliptic curve cryptography for mobile environment. Our proposed scheme only requires two round-messages. Furthermore, the proposed scheme not only satisfies security requirements for PAKE scheme but also achieves efficient computation and communication.

• Journal of KIISE:Information Networking
• /
• v.30 no.1
• /
• pp.75-81
• /
• 2003

User authentication, including confidentiality, integrity over untrusted networks, is an important part of security for systems that allow remote access. Using human-memorable Password for remote user authentication is not easy due to the low entropy of the password, which constrained by the memory of the user. This paper presents a new password authentication and key agreement protocol suitable for authenticating users and exchanging keys over an insecure channel. The new protocol resists the dictionary attack and offers perfect forward secrecy, which means that revealing the password to an attacher does not help him obtain the session keys of past sessions against future compromises. Additionally user passwords are stored in a form that is not plaintext-equivalent to the password itself, so an attacker who captures the password database cannot use it directly to compromise security and gain immediate access to the server. It does not have to resort to a PKI or trusted third party such as a key server or arbitrator So no keys and certificates stored on the users computer. Further desirable properties are to minimize setup time by keeping the number of flows and the computation time. This is very useful in application which secure password authentication is required such as home banking through web, SSL, SET, IPSEC, telnet, ftp, and user mobile situation.