| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform wireless communication of high confidentiality with a PC without requiring projection of an encryption key on a screen or keyboard input to the PC. <P>SOLUTION: An image projection device 1 projects a display image corresponding to input data on a target surface 3 of projection. The device includes: an encryption key generation unit 14 which generates an encryption key at random; a data communication unit 14 which communicates data through wireless communication to external apparatuses 4, 5 having acquired the encryption key through a memory 7 mounted removably on the device (or communication with the image projection device); and a key invalidation unit 14 which invalidates the encryption key in response to power-off operation of the device. <P>COPYRIGHT: (C)2011,JPO&INPIT |
