CRYPT, WhatsApp Encrypted Dastabase File (.crypt)
The CRYPT Database file format
Files with the CRYPT extension are associated to the WhatsApp messenger app for smartphones. The application stores it's backup information in an encoded file, resulting in a CRYPT file in the phone's file directory. They are typically stored under /sdcard/WhatsApp/Databases
Technical details of CRYPT files
CRYPT files can be generated manually for backup purposes of WhatsApp messages and profile information. This can be done inside the app under "Settings". Under "Chat Settings" there is an option to backup conversations. This action will create the manual CRYPT file. Messages can be easily restored using this file. After uninstalling the WhatsApp messenger, the CRYPT file has to be renamed to "msgstore.db.CRYPT". Afterwards, the app can be re-installed. Following the "Restore" prompt will restore the previously backed up messages.