Whitepaper: https://scontent.whatsapp.net/v/t39.8562-34/241394876_546674233234181_8907137889500301879_n.pdf/WhatsApp_Security_Encrypted_Backups_Whitepaper.pdf?c

Whitepaper: https://scontent.whatsapp.net/v/t39.8562-34/241394876_546674233234181_8907137889500301879_n.pdf/WhatsApp_Security_Encrypted_Backups_Whitepaper.pdf?ccb=1-5&_nc_sid=2fbf2a&_nc_ohc=XhVTjVGfRagAX99xd-5&_nc_ht=scontent.whatsapp.net&oh=28cad2d39f178a98763504458549aed6&oe=6140577C https://scontent.whatsapp.net/v/t39.8562-34/241394876_546674... I think this is similar to how Google encrypts your backups.