• Journal of Digital Convergence
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• v.10 no.4
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• pp.229-233
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• 2012

A RFID system is a technology for detecting information on an object through wireless communication between a tag on the object and a reader, and its applications are being expanded to various areas. Because of its wireless communication, however, there are many vulnerabilities in security. Until now, many studies have been executed in order to solve problems related to the security and stability of RFID. In order to resolve vulnerabilities in existing security methods for privacy protection, this study proposed an authentication protocol that uses hash values received from tags and random numbers. When the proposed protocol was implemented, it was safe from various types of attacks between tag and reader and between reader and DB. Furthermore, compared to recently proposed protocols, it could implement a RFID system with enhanced security and less computation in tags.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.2
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• pp.73-80
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• 2005

We propose a Quantum Authentication and Key distribution protocol based on one-time n using one-way Hash function. The designated users can authenticate each other and the arbitrator using their one-time ID and distribute a quantum secret key using remained GHZ states after authentication procedure. Though the help of the arbitrator is needed in the process of authentication and key distribution, our protocol prevents the arbitrator from finding out the shared secret key even if the arbitrator becomes an active attacker. Unconditional security can be proved in our protocol as the other QKD protocols.

• Journal of KIISE:Information Networking
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• v.31 no.2
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• pp.207-216
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• 2004

IPsec protocol has been developed to provide security services to Internet. Recently IPsec is implemented on the various operating systems Hence, it is very important to evaluate the stability of the Ipsec protocol as well as other protocols that provide security services. However, there has been little effort to develop the tools that require to evaluate the stability of IPsec protocols. Therefore, in this paper, we develope the security requirements and suggest a security evaluation system for the Internet packet protection protocols that provide security services at the If level that can be used to check if the security protocols Provide the claimed services correctly This system can be used as debugging tool for developing IPsec based security system.

• Journal of Advanced Navigation Technology
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• v.14 no.3
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• pp.415-425
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• 2010

In public network, user authentication is important security technology. Especially, password-based authentication method is used the most widely in distributed environments, and there are many authentication methods. Their SPMA protocol indicates vulnerability about problem that NSPA protocol does not offer mutual authentication, and proposed Strong Password Mutual Authentication protocol with mutual authentication. However, SPMA protocol has vulnerability of replay attack. In the paper, we analyzed vulnerability to replay attack of SPMA protocol. And we also proposed Improved Strong Password Mutual Authentication protocol to secure on replay attack with same efficiency.

• Journal of the Korea Society of Computer and Information
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• v.11 no.6 s.44
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• pp.193-200
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• 2006

RFID technology has been gradually expanding its application areas however studies on personal space infringement along with security are insufficient. This paper proposes a new security protocol access time interval scheme and RSA algorithm to analyze existing RFID security protocol and attempts to solve the problem of lightweight protocol. Information protection for two-way channels can be enforced through the proposed protocol and other issues of sniffing and man-in-the-middle attacks can be solved by applying a mutual certification technique application among tag readers.

• Journal of the Korea Society of Computer and Information
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• v.8 no.3
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• pp.144-149
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• 2003

Encryption/decryption delay is minimized, because there are constraints in transporting a multimedia data through the Internet. Therefore, encryption algorithm is needed which is changed with considering network traffic and load. And during many users participate in the same multimedia service, an user who already left the service can receive and the method which decrypt the RTP payload is needed because of knowing the encryption key. Therefore in this paper, Security Control Protocol for RTP is designed and implemented for changing the encryption algorithm and the key.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.3
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• pp.95-102
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• 2002

Interactive hashing is a protocol introduced by Naor, Ostrovsk Venkatesan, $Yung^{[1]}$ with t-1 round complexity and $t^2$ - 1 bits communication complexity for given t bits string. In this paper, we propose more efficiently extended interactive hashing protocol with t/m- 1 round complexity and $t^2$/m - m bits communication complexity than NOVY protocol when m is a divisor of t, and prove the security of this.

• Journal of the Korea Society of Computer and Information
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• v.16 no.11
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• pp.163-171
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• 2011

Because RFID systems use radio frequency, they have many security problems such as eavesdropping, location tracking, spoofing attack and replay attack. So, many mutual authentication protocols and cryptography methods for RFID systems have been proposed in order to solve security problems, but previous proposed protocols using AES(Advanced Encryption Standard) have fixed key problem and security problems. In this paper, we analyze security of proposed protocols and propose our protocol using OTP(One-Time Pad) and AES to solve security problems and to reduce hardware overhead and operation. Our protocol encrypts data transferred between RFID reader and tag, and accomplishes mutual authentication by one time random number to generate in RFID reader. In addition, this paper presents that our protocol has higher security and efficiency in computation volume and process than researched protocols and S.Oh's Protocol. Therefore, our protocol is secure against various attacks and suitable for lightweight RFID tag system.

• Review of KIISC
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• v.17 no.2
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• pp.9-23
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• 2007

The air interface supports a security layer which provides the key exchange protocol, authentication protocol, and encryption protocol. The authentication is performed on the encryption protocol packet. The authentication protocol header or trailer may contain the digital signature that is used to authenticate a portion of the authentication protocol packet that is authenticated. The encryption protocol may add a trailer to hide the actual length of the plaintext of padding to be used by the encryption algorithm. The encryption protocol header may contain variables such as the initialization vector (IV) to be used by the encryption protocol. It is our aim to firstly compute the session key created from the D H key exchange algorithm, and thereof the authenticating key and the encryption key being generated from the session key.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2007.02a
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• pp.26-31
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• 2007

An ad hoc network is a collection of mobile nodes without any Infrastructure. However, ad hoc networks are vulnerable to attacks such as routing disruption and resource consumption; thus, routing protocol security is needed This paper proposes a secure and efficient routing protocol for mobile ad hoc networks, where only one-way hash function are used to authenticate nodes in the ROUTE REQUEST, while additional public-key cryptography is used to guard against active attackers disguising a node in the ROUTE REPLY.