Insider Attack Sample Clauses

Insider Attack. If an insider within the group of valid members can obtain the password of a victim member and impersonate this victim node in order to communicate with another member, then we declare that this security protocol cannot prevent against an insider attack. In TLPKA, members can establish a pairwise key without revealing secret information through a wireless channel. An insider can only know the pre-distributed secret that belongs to him or her. He/She knows nothing about any other member’s secret information. Therefore, we can see that TLPKA can prevent against an insider attack.

Insider Attack. K In addition to the above attack, we will show that an insider (say B) can easily fool one party (say C) into accepting a wrong key such that C will be excluded from the communications. This might result in serious risk, for example if C acts as an on-line escrow agent, an auditor or a referee. If B could impersonate C to A, then B can communicate with or performing transactions with A; whereas A would do the transactions or communications only if C (the referee) is monitoring the contents on-line. With no referee involved, this might cause serious risk for A. We demonstrate one example attack as follows. In the following, the notation that the key was originally computed by C for A but is modified by B. AB C ( B )→ A denotes 222 資 訊 管 理 學 報 第 十 八 卷 第 二 期 A A → B : g a || Cert ; (1) B → C : g a || Cert || g b || Cert || g t

Insider Attack. Definition 4.10. An insider attack is a malicious attack perpetrated on a network or computer system by a person with authorized system access.

Insider Attack. Insider attack means that if an insider of HA has obtained a mobile user MN’s password, there may be an unautho- rized and illegitimate access to any foreign agent. In the registration phase of Xu et al.’s protocol, MN sent his identity IDMN and password PWMN to the home agent HA, that is, PWMN was revealed to HA. It will give an inside attacker an opportunity to impersonate other users. With a strong authentication protocol in wireless networks, there should be no way to directly obtain the users’ passwords.

Insider Attack. Definition 4.10.

Insider Attack. Assume that the privileged user gets IDi, RPWi when a legal user Ui registers to the system Si. However, the privileged couldn’t extract PWi from RPWi due to one- way property of hash function. At the same time, PWi is protected by random number b, and the privileged user is not able to guess the right password. Thus, the proposed scheme can resist insider attack.