Question [Q] Recover Viber Cache from SDCARD of broken phone.

Hi there

My Xperai Mini Pro SK17i screen smashed and tried to change the screen but no luck.
When I connect it to the PC it just shows red light blinking once per second.

I have removed the 8GB sdcrad from it and I can see that there are viber backup in folder named VIBER on the sdcard root but it has only the images.
I have found another folder in SDCard\Android\DATA\com.viber.voip\CACHE
It has the following files (see attchment)
the biggest file is cache_vts_com.viber.voip.0 2.50MB and I guess it has the chat history.
I wonder if anyboy please tell me how to decrypt it?
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Sony Xperia ARC S ICS 4.0.3 [4.1.A.0.562]
Toshiba TG01 Windows Phone 7
Sony Xperia Mini Pro 2.3.4 [4.0.2.A.0.62]