Home Software Paychex send/receive decryption issue Software Paychex send/receive decryption issue By Mitch - August 21, 2007 1785 0 FacebookTwitterPinterestWhatsApp Gave error “Key Does Not Match” when trying to decrypt the XXXX file. Same for XXXY. Called Paychex, they will reset the encryption and regenerate the file for us. Takes 15min.