ALP：一種在保持帳戶鎖定的同時解決帳 戶拒絕服務攻擊的解決方案

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姓名

何雋永(Chun-Yung Ho) 查詢紙本館藏

畢業系所

資訊工程學系

論文名稱

ALP：一種在保持帳戶鎖定的同時解決帳戶拒絕服務攻擊的解決方案
(ALP: A Solution Solving Account Denial-of-Service while Maintaining Account Lock)

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[Endnote RIS 格式]

[Bibtex 格式]

[相關文章]

[文章引用]

[完整記錄]

[館藏目錄]

至系統瀏覽論文 (2029-6-30以後開放)

摘要(中)

使用帳戶密碼進行驗證的登入方式廣泛應用於各種應用程式。
然而，攻擊者可能通過自動化腳本對應用程序進行暴力破解攻擊。
為了防止帳戶被惡意攻擊者破解並導致帳戶被接管，大多數應用程
式都採取了帳戶鎖定政策。然而，帳戶鎖定政策也可能被用於阻斷
服務攻擊，導致合法使用者無法訪問自己的帳戶。
現有的解鎖方式在面對持續的帳戶阻斷服務攻擊時往往無法有
效防範，甚至在 SSH 上也缺乏相關的解鎖方式。因此，需要一個解
決方案，既能讓使用者正常訪問帳戶，又能保護使用者免於帳戶被
反覆鎖定的風險。
在這篇論文中，我們提出 ALP 來保護系統避免同時受到密碼破
解和帳戶 DoS 攻擊。

摘要(英)

Password-based authentication is widely used in various applications.
However, attackers may use automated scripts to perform brute force
attacks on these applications.
To prevent accounts from being compromised by malicious attackers,
most applications implement account lockout policies. However, these
account lockout policies can also be exploited for Denial-of-Service
attacks, preventing legitimate users from accessing their accounts.
Existing unlock mechanisms are often ineffective against sustained
account lockout attacks and are even absent for services like SSH.
Therefore, a solution is needed that allows users to access their accounts
normally while protecting them from the risk of repeated account lockouts.
In this paper, we propose Account Lock Protector (ALP) to defend a
system against password cracking and account DoS simultaneously.

關鍵字(中)

★ 帳戶鎖定
★ 阻斷服務攻擊

關鍵字(英)

★ account lockout
★ Denial-of-Service

論文目次

目錄
中文摘要..................................................................................................... i
Abstract...................................................................................................... ii
目錄........................................................................................................... iii
圖目錄.........................................................................................................v
第 1 章緒論 ...........................................................................................1
第 2 章背景介紹 ...................................................................................4
2.1 帳戶安全.................................................................................................................. 4
2.2 帳戶鎖定政策.......................................................................................................... 5
2.3 帳戶恢復機制.......................................................................................................... 7
2.4 Secure Shell.............................................................................................................. 8
2.5 可插拔身分驗證模組............................................................................................ 10
第 3 章相關研究 .................................................................................12
第 4 章系統架構與實作 .....................................................................14
4.1 設計目標................................................................................................................ 14
4.2 設計概念................................................................................................................ 15
4.3 系統架構................................................................................................................ 16
4.4 系統元件................................................................................................................ 18
第 5 章實驗結果及分析 .....................................................................21
5.1 實驗環境................................................................................................................ 21
5.2 功能測試................................................................................................................ 22
5.3 效能測試................................................................................................................ 25
iv
第 6 章討論 .........................................................................................27
6.1 電子郵件安全性.................................................................................................... 27
6.2 中間人攻擊 (MITM) ............................................................................................. 27
第 7 章結論 .........................................................................................28
第 8 章參考資料 .................................................................................29

參考文獻

[1] SSH https://medium.com/quick-code/how-ssh-works-9349293cdf61
[2] Blocking Brute Force Attacks https://owasp.org/wwwcommunity/controls/Blocking_Brute_Force_Attacks
[3] PMA https://community.cloudera.com/t5/CommunityArticles/Understanding-Security-basic-for-dummies/ta-p/247315
[4] account lockout policy https://activedirectorypro.com/accountlockout-policy
[5] Michael R. Bartolacci, Larry J. LeBlanc, Ashley Podhradsky
"Personal Denial of Service (PDOS) Attacks: A Discussion and
Exploration of a New Category of Cyber Crime Exploration" 2014.
[6] K. Anushka, Chamantha, A. P. Karunaweera, P. R. Priyashantha, H.
D. R. Wickramasinghe, W. A. V. M. G. Wijethunge "Case study on
exploitation, detection and prevention of user account DoS through
Advanced Persistent Threats" 1 Aug 2015.
[7] Phuong M. Cao, Yuming Wu, and Subho S. Banerjee "CAUDIT:
Continuous Auditing of SSH Servers To Mitigate Brute-Force
Attacks" 26-28 Feb 2019.
[8] Yu Liu, Matthew R. Squires, Curtis R. Taylor "Account Lockouts:
Characterizingand Preventing Account Denial-of-Service Attacks,"
11 December 2019
[9] Marina Sanusi Bohuk, Mazharul Islam, Suleman Ahmad, Cloudflare
"Gossamer: Securely Measuring Password-based Logins" 10-12
Aug 2022.
[10] Sachin Kumar Singh and Shreeman Gautam "Where The Wild
Things Are: Brute-Force SSH Attacks In The Wild And How To
Stop Them" 16-18 Apr 2024.
[11] Y. Yang, K. C. Yeo, S. Azam, A. Karim, R. Ahammad, and R.
Mahmud "Empirical study of password strength meter design" 2020
Mahmud "Empirical study of password strength meter design" 2020
[12] AKIN ALKAN "Analysis of Failed SSH Attempts for Intrusion
Detection" 2024

指導教授

許富皓(Fu-Hau Hsu)

審核日期

2024-7-22

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