17 1 JavaScript JavaScript SCvanisher SCvanisher JavaScript SCvanisher JavaScript SCvanisher JavaScript JavaScript SCvanisher JavaScript HTML SCvanish
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- さあしゃ わたぬき
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1 Vol. 3 No (Sep. 2010) 1 2 Ajax Ajax JavaScript JavaScript SCvanisher SCvanisher JavaScript JavaScript JavaScript SCvanisher JavaScript JavaScript Hiding Source Code of Web Application on Client Browser Takahiro Orito 1 and Hideya Iwasaki 2 Recently web applications that use JavaScript have become very popular. Developers of such applications cannot avoid publishing JavaScript source code, because the code has to be sent from the web server to the client to be executed on the client s browser. This causes two problems. First, the source code could be stolen by another developer. Second, if the application has a security hole, attackers could easily find out its vulnerability. In this paper, we propose SCvanisher, a mechanism that hides the source code of a web application from the clients. SCvanisher executes the original JavaScript code of the application on the web server, and sends the resultant web page that do not include the original code to the client. It achieves interactive behavior of a web application such as the text input by making both server and client sides cooperate. By using SCvanisher, the developer can easily describe JavaScript code without being annoyed with hiding its source code. 1. JavaScript Ajax Asynchronous JavaScript and XML Ajax JavaScript Ajax JavaScript JavaScript JavaScript JavaScript Google Maps Google Maps JavaScript 1 1 Graduate School of Electro-Communications, The University of Electro-Communications 2 Graduate School of Informatics and Engineering, The University of Electro-Communications 16 c 2010 Information Processing Society of Japan
2 17 1 JavaScript JavaScript SCvanisher SCvanisher JavaScript SCvanisher JavaScript SCvanisher JavaScript JavaScript SCvanisher JavaScript HTML SCvanisher JavaScript JavaScript SCvanisher 4 5 SCvanisher 6 1 SCvanisher SCvanisher Dotfuscator 1) Microsoft.NET Framework SHTML 2) HTML JavaScript 3) 4) 5) SHTML
3 18 JavaScript JavaScript 6) 2.2 bruby 7) Exerb 8) JavaScript Ruby Ruby bruby Exerb Windows 9) Jaxer 10) 1 JavaScript Jaxer Jaxer JavaScript Jaxer JavaScript JavaScript JavaScript JavaScript JavaScript 3.2 JavaScript SCvanisher 1 JavaScript 1 1 JavaScript DOM HTML JavaScript DOM JavaScript SCvanisher Firefox JavaScript JavaScript
4 19 DOM JavaScript SCvanisher Telnet Telnet Firefox MozRepl DOM Telnet MozRepl 3.4 Firefox MozRepl MozRepl Telnet 1 SCvanisher 1 Firefox MozRepl SCvanisher HTML script JavaScript HTML JavaScript JavaScript HTML SCvanisher VNC Virtual Network Computing VNC JavaScript VNC 3.3 SCvanisher 1 SCvanisher JavaScript 1 SCvanisher Fig. 1 Outline of operations of SCvanisher. 2 SCvanisher Fig. 2 Overall structure of SCvanisher. SCvanisher 2 JavaScript JavaScript 3
5 20 JavaScript JavaScript JavaScript HTML JavaScript JavaScript 3.4 SCvanisher JavaScript JavaScript 4 JavaScript JavaScript HTML 3.2 Firefox MozRepl JavaScript Telnet MozRepl Telnet IP Telnet Firefox JavaScript Firefox SCvanisher Firefox Ajax SCvanisher 2 ID JavaScript JavaScript JavaScript JavaScript JavaScript JavaScript JavaScript JavaScript HTML div 11) JavaScript JavaScript Perl CGI Telnet DOM JavaScript Firefox id Firefox
6 21 3 Fig. 3 Conversion example by relay part. Telnet JavaScript JavaScript Firefox HTML Telnet HTML 3 3 JavaScript SCvanisher HTML 1 JavaScript JavaScript JavaScript JavaScript 1 Table 1 Conversion rule in relay part. script noscript input select etc a href img src etc 3 3 sendiptval id runjsfunc sendiptval runjsfunc 3.3
7 22 SCvanisher HTML SCvanisher JavaScript HTML SCvanisher SCvanisher SCvanisher ID Ajax JavaScript Perl SCvanisher Google Chrome JavaScript JavaScript ID SCvanisher SCvanisher ID JavaScript JavaScript SCvanisher Microsoft Internet Explorer Mozilla Firefox Google Chrome (1) URL (2) ID (3) (4) (5) (6) (7) (8) (9) 4 5 Firefox (1) (4) SCvanisher HTML 4 5 HTML HTML JavaScirpt document.body.innerhtml HTML SCvanisher onclick sendiptval runjsfunc
8 23 (a) <div id="maintable"><table><tbody> <tr> <td align="center">iidx ID</td> <td align="center"> <input size="16" id="iidxid" value="" onchange="sendiptval( iidxid )" type="text"></td> </tr> <tr> <td colspan="2" align="center"> <input value="login" onclick="runjsfunc( Login, )" type="button"></td> </tr> </tbody></table></div> (b) SCvanisher HTML 4 SCvanisher (1) Fig. 4 Snapshot of SCvanisher ( 1 ). <div id="maintable"><table><tbody> <tr> <td align="center">iidx ID</td> <td align="center"> <input size="16" id="iidxid" value="" type="text"></td> </tr> <tr> <td colspan="2" align="center"> <input value="login" onclick="login()" type="button"></td> </tr> </tbody></table></div> (c) SCvanisher HTML SCvanisher SCvanisher JavaScript JavaScript Load Average CPU Load Average (a) <div id="uptable"> <input value="status" onclick="runjsfunc( MakePlayerTable,u_data )" type="button"> </div> <div id="midtable"> <input value=".win" onclick="runjsfunc( UpdateSongPack,14,rvl1 )" type="button"> </div> <div id="maintable"><table width="698"> <tbody><tr> <td align="center"> <a href="javascript:runjsfunc( test1,14 )">Lv</a></td> (b) SCvanisher HTML 5 SCvanisher (4) Fig. 5 Snapshot of SCvanisher ( 4 ). <div id="uptable"> <input value="status" onclick="makeplayertable(u_data)" type="button"> </div> <div id="midtable"> <input value=".win" onclick="updatesongpack(14,rvl1)" type="button"> </div> <div id="maintable"><table width="698"> <tbody><tr> <td align="center"> <a href="javascript:test1(14)">lv</a></td> (c) SCvanisher HTML 0.1 Load Average , CPU: Intel Pentium4 3.0 GHz RAM: 1,024 MB OS: Debin GNU/Linux
9 24 3 Table 3 Number of communications and amounts of transferred data. SCvanisher SCvanisher / / / (1) , ,746 2, ,299 (2) 23 10,393 14, ,737 1, ,692 14,299 (3) 3 1,207 4, ,390 9, ,246 4,512 (4) ,160 5, (5) ,745 5, (6) ,147 4, (7) ,156 4, (8) ,156 4, (9) , ,345 26, ,384 38, ,722 26, Fig. 6 Execution times in relay part. 2 Table 2 Execution times in relay part (in milliseconds) Load Average : Load Average : LA2.5 / LA ,000 Load Average : Load Average : LA2.5 / LA SCvanisher 1, ,000 SCvanisher SCvanisher SCvanisher SCvanisher (1) (8) SCvanisher Firefox Apache Apache favicon.ico 3 (2) / 1,278 / 14,299 SCvanisher SCvanisher / SCvanisher
10 25 / SCvanisher / SCvanisher (13, ,445)/(13, ,939) = 1.29 SCvanisher 30% SCvanisher SCvanisher JavaScript JavaScript SCvanisher JavaScript JavaScirpt SCvanisher SCvanisher SCvanisher 4.1 Wiki SCvanisher SCvanisher Flash JavaScript Firefox MozRepl MozRepl Telnet Firefox 1 JavaScript Firefox 1 MozRepl IP prototype.js SCvanisher DoS SCvanisher DoS SCvanisher 6. SCvanisher SCvanisher SCvanisher SCvanisher SCvanisher SCvanisher SCvanisher SCvanisher JavaScript Ajax
11 26 1) Solutions, P.: Dotfuscator (2003). 2) SHTML (2005). 3) ISEC95-25, pp.9 14 (1995). 4) Vol.J80-D-1, No.7, pp (1997). 5) Cerven., P.: Crackproof Your Software The Best Ways to Protect Your Software Against Crackers, No Starch Press (2002). 6) Barak, B., Goldreich, O., Impagliazzo, R., Rudich, S., Sahai, A., Vadhan, S. and Yang., K.: On the (Im)possibility of Obfuscating Programs, Lecture Notres in Computer Science, Vol.2139, pp.1 18 (2001). 7) bruby (2002). 8) Exerb (2002). 9) 14 (2002). 10) Aptana Jaxer (2008). 11) Hanakawa, N. and Ikemiya, N.: A web browser for Ajax approach with asynchronous communication model, Proc IEEE/WIC/ACM International Conference on Web Intelligence, pp (2006). ( ) ( ) ACM
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