[html5] some question about Security with canvas elements

caoyipeng caoyp at cn.fujitsu.com
Mon Apr 6 23:09:41 PDT 2009

>> Security with canvas elements

>>Even resetting the canvas state by changing its width or height attributes
doesn't reset the origin-clean flag.


When resetting the canvas's width or height attributes, the bitmap should be
cleared back to their initial state, 

there is no Information leakage at all, why the origin-clean should not be




Cao Yipeng
Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
8/F., Civil Defense Building, No.189 Guangzhou Road ,
Nanjing , 210029, China 
TEL: +86+25-86630566-817
COINS: 79955-817
FAX: +86+25-83317685
MAIL: caoyp at cn.fujitsu.com



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