Is it possible to decrypt msgstore.db.crypt8 file I am having a file msgstore.db.crypt8 that is actually backup file of whatsApp. I don't have a rooted phone so is it still possible to read this file ??

If yes then how can i do that ?

I tried to download some software that extract a key using phone but this process required rooted phone that i don't have.
PREREQUISITES:
  
  
  O/S: Windows Vista, Windows 7 or Windows 8 
  Java - If not installed: Download Java 
  ADB (Android Debug Bridge) Drivers - If not installed: ADB Installer
  USB Debugging* must be enabled on the target device. Settings -> Developer Options -> (Debugging) USB debugging Android device with Android 4.0 or higher
  
  
  *= If you cannot find Developer Options then please go to: Settings -> About phone/device and tap the Build number multiple times until you're finally declared a developer.
  
  INSTRUCTIONS: 
  
  
  Extract "WhatsAppKeyExtract.zip" on your computer maintaining the directory structure. 
  Browse to the extracted folder and click on "WhatsAppKeyExtract.bat". Connect your device via USB**, unlock your screen and wait for "Full backup" to appear. 
  Leave the password field blank and tap on "Back up my data". 
  The "extracted" folder will now contain your "whatsapp.key", "msgstore.db" and "wa.db".
  
  
  ** = If you have never used USB Debugging before, you may also need to verify the fingerprint.


Source: [Tool] WhatsApp Key/DB Extractor | OFFICIAL | CRYPT8 | NON-ROOT | UPDATED APRIL 2015