yikcrypt: nDGu85pBIb3eOxQ
ybkcrypt: appsoft_series_system_backupandrestore_2016_ys29_4_ms23_202
ypkcrypt: 2016_ys29_4_ms23_202_appsoft_series_appcenter_ypk
If you want to decrypt, use this (most file are yikcrypt):
openssl enc -aes-256-cbc -md md5 -d -pass pass:nDGu85pBIb3eOxQ -in firmware.bin -out firmware.tar