20 Covert Channel

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ちかこふじつぐ
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1 20 Covert Channel

2 Covert Channel Covert Channel RDF protege Covert Channel Covert Channel Covert Channel

4 2.1 Covert Channel( ) RDF RDF RDF XML Covert Channel Covert Channel HTML chasen RDF protege Covert Channel

5 1 [8][9],,,.,,. Covert Channel[8][9] Covert Channel ACL[8][9](Access Control List) Covert Channel Covert Channel ACL Covert Channel, [2] [1][10] ACL,, DB [5] RDF[3][6] ACL 4

6 5,Covert Channel,,RDF, Covert Channel

7 2 2.1 Covert Channel Covert Channel [7][8][9], Subject,Object, permission, 3.,Covert Channel,. 2.1, S=Subject, O=Object,R=,W= 2.1, Subject1 Object1. Covert Channel.. Subject2 Object1 Subject2 Object1 Subject2 Object2 Subject2 Object2 Object1 Subject1 Object2 Subject1 Object2. Object1 Subject1 Covert Channel Object1,,. 6

8 7 2.1: Covert Channel( ) Covert Channel Covert Channel, (Covert Channel),,,. Covert Channel.. 1 PC.mixi SNS 2, PC,. WWW. Covert Channel. 2.2 Covert Channel, Subject Subject. Subject

9 8,Covert Channel, Subject k k. k 2 k 2. 2, k, Covert Channel. 2.3 Subject,Object,permission. Subject Covert Channel Object. Object Covert Channel,. Subject Object. permission, READ WRITE EXE 3 permission,. permission read write read write 4. Covert Channel.

10 9 2.4,,..,permission(read,write, read, write),subject,object,.,,. 2.5 Covert Channel Covert Channel 4 3 Read Covert Channel Covert Channel 2.2 (1)(2)(3)(4) Covert Channel (1) (S1,O1) READ (2) (S1,O2) WRITE (3) (S2,O1) READ (4) (S2,O2) READ (1) (4) Covert Channel

11 10 2.2: [2]. Yahoo! Japan.

12 11 URL Google.,,. Google,, Web Web HEML HTML HTML

13 12 HTML ( ) ( ) HTML URL URL ( ) HTML URL 2.7 [4][5],,.,..,., She likes a cake or something like that She/ like/ a/ cake/ Or/ something/ like/ that/./., /. SHE lile a cake something llike that,likes. WWW, Web.,,.,,

14 13,,.,,,,.,..,..,,. 2.8 RDF RDF[3][6],,, 3. RDF : RDF RDF,.

15 14 2.4: RDF RDF,,,.,. RDF,,URI URI., URI,,,dc:creator URI.,,URI,.,,URI.,RDF,, URI. 2.5: RDF XML

16 15,rdf:description,rdf about URI, dc:creator rdf: RDF Model and Syntax.

17 Ontology[1][10],,, 2.9.2,., is-a part-of attribute-of instanceof,. is-a is-a -. is-a., ( ),...,. part-of part-of, -.,. (class) part-of

18 17, class instance - ( ).. (is-a)part-of. instance -. instance instance.part-of,. attribute-of attribute-of,,,. (is-an)attribute-of (which is-a)part-of. instance-of instance-of, (instance)., instance instance-of.instance-of x instance,x instance., instance is-a instance protege Protege 10 ( ) protege

19 3 3.1 Covert Channel Covert Channel object. 1,object subject object.r read W write. Subject3 Object1. ACL S3 O1. O1 S2 O8 Sothers.S 08 S3 O1. 3.1: Covert Channel 18

20 Covert Channel ACL Covert Channel ACL 3.2: Covert Channel

21 Covert Channel Covert Channel..,,. HTML kogane 02/ kogane kogane kogane kogane /01 02/01 02/01 02/

22 : HTML

23 22 3.4: chasen Hadoop Hadoop Google Map Reduce 2 Hadoop 2 Mastar Worker Map Worker( ) Map Map Map

24 23 Map key/value Reduce Map Reduce Map Reduce

25 24, RDF.,RDF RDF , ( ) ( ) ( ). 3.5: RDF

25 DB. 090-4216-0000instance-of is-a is-a.

26 25 DB instance-of is-a is-a. DB protege. 3.6: protege ACL RDF DB ACL ACL.

27 26 Covert Channel, ACL Web ACL. Covert Channel S1 S2 S2 S1 S : Covert Channel

28 4 CovertChannel ACL CovertChannel ACL, Covert Channel, Hadoop RDF RDF DB ACL,ACL 27

29 5 28

30 [1],,, (2006) [2] : Ruby (2009) [3] RDF/OWL (2005) [4] ChaSen s Wiki, [5] /, 05/slides/enshu-slides-4up.pdf [6] HTML/XHTML, [7] (2009) [8] : Covert Channel [9] : Covert Channel 2007 [10] : Ontology

31 6 Q1 Q2 ACL 1

スライド 1

スライド 1 検索エンジンを利用した Covert Channelの検出木下研究室 200602824 久保直也研究の背景目的近年ネットワークの巨大化によりアクセス権限も複雑に絡み合っているネットワーク内では不正な情報経路が発生し情報流出の危険性が増大してしまっているこのような情