在本論文中, 我們利用黑名單/白名單以及多類別支撐向量機的觀念，以資料探勘的方法建立一個三層式的入侵偵測系統。在此，黑名單代表的是一系列已知攻擊的模式，白名單是一系列正常活動的行為表現，多類別支撐向量機則是將偵測到的入侵行為分類的方法。這種三層式的架構可以增進偵測的正確性 (入侵偵測率 94.71%)。我們採用KDD’99資料組來評估我們提出的方法。
我們用KDD’99提供的的10%訓練資料集，來訓練RIPPER規則學習系統，以得到一個包含已知攻擊模式的黑名單。這個黑名單要用整個訓練資料組，4,898,431筆資料中的3,925,650筆攻擊，來做驗證。結果，得到的黑名單在測試資料組中可以找到97.54%的已知攻擊與7.84%的未知攻擊。之後，我們將972,734筆正常的連結依據通訊協定與網路服務的種類分類成27種活動，並算出其範疇而得到我們的白名單，用每種活動的範疇來檢驗一個即將進入系統的連結是不是一個攻擊。我們的白名單在測試資料組中可以偵測到1.91%的已知攻擊和23.40%的未知攻擊。最後，利用多類別支撐向量機來對白名單偵測到的攻擊作分類。
此一三層式的入侵偵測系統的入侵偵測率與入侵診斷率分別是94.71%和93.52%，每個連結的平均扣分是0.1781，這些結果都比KDD’99的冠軍要好。另外，我們的虛警率也只有3.8%
我們的系統具有相當的彈性，黑名單允許網管人員依據需要加入新的攻擊模式到黑名單中，白名單則允許網管人員依據系統的實際狀況作微調。

In this thesis, we design a three-tier intrusion detection system,
IDS, via data mining approach based on the concept of
blacklist/whitelist and the method of multiclass SVMs. Blacklist
here stands for a list of patterns for known attacks, whitelist for
a list of behaviors of the normal activities and multiclass SVMs for
the method of categorizing the anomalies detected by the whitelist
into the four attack classes: PROBE, DoS, U2R and R2L. The
utilization of blacklist/whitelist can improve the performance of
detection, 94.71%. The KDD'99 benchmark dataset is employed to
examine the performance of the designed IDS.

RIPPER rule learning system is applied on the smaller training
dataset, 10%, to obtain the blacklist, a rule set containing the
patterns of old attacks. The blacklist is validated by the entire
huge training dataset, 3,925,650 attacks among 4,898,431 examples.
The blacklist can detect up to 97.54% of old attacks and 7.84% of
new attacks in test data set. Then the whitelist is obtained by
categorizing 972,734 normal connections into 27 activities,
according to features ``protocol_type" and ``service", and
calculating each activity's profile. The profile of each activity is
used to examine an incoming connection whether it is an attack or
not. The whitelist can detect 1.91% of old attacks and 23.40% of
new attacks in test dataset. Finally multiclass SVMs are used to
classify the attacks, detected by the whitelist, as their specific
categories.

The intrusion detection performance and intrusion diagnosis
performance of the three-tier IDS are respectively 94.71% and
93.52%. The average cost for each connection is 0.1781. These
results are all better than those of KDD'99 winner's. Our false
alarm rate is only 3.8%.

The blacklist performs flexibly, allowing the net manager to add new
patterns to the rule set, and the whitelist allows the net manager
to do fine tuning according to the situation of their system.

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