The "crypt12" extension signifies the specific encryption algorithm version used by WhatsApp at the time of the backup. While newer versions like crypt14 or crypt15 exist, crypt12 remains common in older backups or specific app versions.
The file is a 256-bit AES encrypted database file created by WhatsApp on Android devices. It serves as a local backup of your chat history, including messages, timestamps, and contact information. Understanding the File Structure msgstore.db.crypt12 download