Veja por " Como recuperar pastas criptografadas Synology no Linux
MOUNTOPTIONS=""
for option in \
"key=passphrase" \
"ecryptfs_cipher=aes" \
"ecryptfs_key_bytes=32" \
"ecryptfs_passthrough=no" \
"ecryptfs_enable_filename_crypto=yes" \
; do
MOUNTOPTIONS="${MOUNTOPTIONS}${MOUNTOPTIONS:+,}$option"
done
sudo mount -t ecryptfs -o $MOUNTOPTIONS,passwd=$PASSWORD $CRYPTDIR $TARGET