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E-raamat: Proceedings of the 3rd European Conference on Computer Network Defense

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The 3rd European Conference on Computer Network Defense took place in September 2007 at Aldemar Hotel, in Heraklion, Crete, Greece in cooperation with the European Network and Information Security Agency (ENISA). The theme of the conference was the protection of computer networks. The conference drew participants from academia and industry in Europe and beyond to discuss hot topics in applied network and systems security. The conference was a great success, with 6 refereed papers and 6 invited presentations on topics ranging from high assurance networks of virtual machines to signaling vulnerabilities in wiretapping systems. This book contains the refereed as well as refereed papers. We are greatful to the authors and presenters for their contributions, as well as the participants of EC2N07 for making the conference a success. We are looking forward to a successful EC2ND event in 2008. K. G. Anagnostakis, S. Ioannidis, V. Siris Contents 1 Tales from the Crypt: Fingerprinting Attacks on Encrypted Channels by Way of Retainting ........................................1 Michael Valkering, Asia Slowinska, and Herbert Bos 1 Introduction ............................................................................. ............ 1 2 Architecture ............................................................................. ............ 3 2.1 Tracking Issues ............................................................................. . 4 2.2 Retainting ............................................................................. ......... 6 2.2.1 Determining the Tag ............................................................. 6 2.2.2 Identifying the SSL Conversation ........................................ 8 2.3 Interposition Details...................................................................... 9 3 Signature Generation ........................................................................... 9 3.1 Pattern-Based Signatures ............................................................. 10 3.2 Signatures for Polymorphic Buffer Overflows ............................ 13 4 Filters ............................................................................. .................... 14 5 Results ............................................................................. .................. 15 6 Related Work ............................................................................. ........ 17 7 Conclusions ............................................................................. .......... 18 References ............................................................................. ............... 18 2 Towards High Assurance Networks of Virtual Machines...............21
1 Tales from the Crypt: Fingerprinting Attacks on Encrypted Channels by Way of Retainting 1
Michael Valkering, Asia Slowinska, and Herbert Bos
1 Introduction
1
2 Architecture
3
2.1 Tracking Issues
4
2.2 Retainting
6
2.2.1 Determining the Tag
6
2.2.2 Identifying the SSL Conversation
8
2.3 Interposition Details
9
3 Signature Generation
9
3.1 Pattern-Based Signatures
10
3.2 Signatures for Polymorphic Buffer Overflows
13
4 Filters
14
5 Results
15
6 Related Work
17
7 Conclusions
18
References
18
2 Towards High Assurance Networks of Virtual Machines 21
Fabrizio Baiardi and Daniele Sgandurra
1 Introduction
21
2 Psyco-Virt Overview
23
2.1 Overall Architecture
24
2.2 Introspection VM
26
2.3 Monitored VM
27
3 Current Prototype
27
3.1 Introspection Functions
27
3.1.1 Detecting Kernel Modifications
27
3.1.2 Running Processes Checker
28
3.1.3 Loaded Modules Authenticator
28
3.1.4 Promiscuous Mode Checker
28
3.1.5 Anti-Spoofing
29
4 Security and Performance Results
29
4.1 Effectiveness
29
4.2 Performance Overhead
30
4.3 Limitations
31
5 Related Works
31
6 Conclusions and Future Developments
32
Acknowledgments
32
References
32
3 Intrusion Detection Using Cost-Sensitive Classification 35
Aikaterini Mitrokotsa, Christos Dimitrakakis, and Christos Douligeris
1 Introduction
35
2 Cost Sensitive Classification
36
2.1 Choice of the Cost Matrix
37
2.2 Algorithmic Comparisons and Alternative Quality Metrics
37
2.3 Models
38
3 Experiments
39
3.1 Databases
40
3.2 Technical Details
41
3.3 Results
42
4 Conclusions
45
References
46
4 A Novel Approach for Anomaly Detection over High-Speed Networks 49
Osman Salem, Sandrine Vaton, and Annie Gravey
1 Introduction
49
2 Related Work
52
3 Background
53
3.1 Count-Min Sketch
53
3.2 Multi-Channel Cumulative Sum Algorithm
54
4 Proposed Approach
57
5 Experiments Results
61
6 Conclusions
66
Acknowledgments
67
References
67
5 Elastic Block Ciphers in Practice: Constructions and Modes of Encryption 69
Debra L. Cook, Moti Yung, and Angelos D. Keromytis
1 Introduction
69
2 Elastic Block Cipher Examples
70
2.1 Overview
70
2.2 Common Items
72
2.3 Elastic AES
73
2.4 Elastic Camellia
75
2.5 Elastic MISTY1
77
2.6 Elastic RC6
78
2.7 Randomness Test Results
80
2.8 Key Schedules
81
3 Modes of Encryption
83
3.1 Overview
83
3.2 Elastic Chaining Mode
84
3.3 Elastic ECB Mode
86
4 Conclusions
88
Acknowledgments
90
References
90
6 Vulnerability Response Decision Assistance 93
Hal Burch, Art Manion, and Yurie Ito
1 Introduction
93
2 VRDA
94
2.1 Facts
96
2.2 Light-Weight Affected Product Tags
98
2.3 Data Exchange
100
2.4 Decision Modeling
101
3 Current Usage
102
4 Future Direction
102
5 Related Work
103
5.1 Common Vulnerability Scoring System (CVSS)
103
5.2 Exchange Formats
104
5.3 Other Work
104
References
104
7 Alice, What Did You Do Last Time? Fighting Phishing Using Past Activity Tests 107
Nikos Nikiforakis, Andreas Makridakis, Elias Athanasopoulos, and Evangelos P. Markatos
1 Introduction
107
2 PACT Architecture
109
2.1 PACT Definition
109
2.2 Example PACTs
109
3 PACT evaluation
110
3.1 PACT Resistance
110
3.2 PACT Suspension Policy
110
3.3 PACT Limitations
111
4 Case Studies
111
4.1 A PACT Enabled E-Mail Service
111
4.2 A PACT Enabled E-Commerce Service
113
4.3 Results
114
5 Related Work
115
6 Conclusions
116
References
116
8 QuiGon: The First Tool Against Clone Attack on Internet Relay Chat 119
Thibaut Henin and Corinne Huguennet
1 Introduction
119
2 Clone Attack on Internet Relay Chat
120
2.1 Internet Relay Chat
120
2.2 Bots and Botnets
120
2.3 Clone Attacks
121
2.4 How to Prevent Such Attacks?
122
3 Usual Protections
122
3.1 Passwords to Enter the Network
122
3.2 Blacklist
123
3.3 Use Simple Regexp
123
4 Qui-Gon
123
4.1 The Temporal Oracle
124
4.2 The Distinguishing Oracle
124
5 Tests and Validation of the Distinguishing Oracle
125
5.1 Test Against Existing Attacks
126
5.2 Test Against a More Clever Attack
127
6 Conclusions
127
References
128
9 Defending Against Next Generation Through Network/Endpoint Collaboration and Interaction 131
Spiros Antonatos, Michael Locasto, Stelios Sidiroglou, Angelos D. Keroniytis, and Evangelos Markatos
1 Introduction
131
1.1 Impact of Failing to Solve the Problem
133
2 Research Directions
133
3 Honey@home
136
4 Application Communities
137
5 Conclusions
139
Acknowledgments
139
References
139
10 ISi-LANA – A Secure Basic Architecture for Networks Connected to the Internet 143
Thomas Haeberlen
1 Introduction
143
2 Basic Architecture
144
2.1 Using Internet Services
145
2.2 Providing Internet Services
145
2.3 Administration and Monitoring
146
2.4 Implementation and Operations
147
3 Discussion
148
3.1 Overall Structure
148
3.2 Structure of the Security Gateway
149
3.3 Structure of the Management Network
149
3.4 Structure of the Internal Network
150
4 Conclusions
150
Author Index 153
Subject Index 155
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