Do Won Hong

Authentication mechanism for fast handoff in cdma2000-WiBro interworking

In this paper, we propose the authentication mechanism for a handoff in cdma2000-WiBro interworking environment. In the interworking environment, the handoff procedure requires the authentication on MS for the access control and the accounting. In the handoff procedure, it is required to perform the EAP-AKA authentication process with cdma2000-HN (home network) because TN (target network) does not have the information for the authentication about MS. This process has relatively long delay. Therefore, the fast handoff authentication mechanism for reducing the long delay in the handoff procedure is needed. Thus this paper proposes the handoff authentication method of using the reactive context transfer and ticket forwarding method, to provide the fast handoff in cdma2000-WiBro interworking environment. The proposed scheme satisfies security requirements on handoff and has the advantage of low signaling overhead in handoff authentication.

A New Anti-Forensic Tool Based on a Simple Data Encryption Scheme

In this paper, we discuss a simple encryption scheme in which a secret file is encrypted twice: one by a common encryption algorithm like AES and another by XOR. Despite the first key is revealed by guessing or dictionary-based attack, the attacker can not reconstruct the original secret until knows the files used to derive the second key block according to our scheme. We also give an explanation about the tool in which the proposed scheme is implemented. It consists of 1 main module and 5 sub-modules: main routine, command parser, file 10, buffer manager, cipher, and time handler. The design goals of the tool include encrypting a file with or without the second encryption and modifying times tamp values such as MAC time information. In addition, the second key can be derived from 3 files at most which are selected and specified as input arguments by a user.