#4 is very widespread and used to be standard practice, under the excuse that you should use chmod to control access, and that access to the encrypted file prob

#4 is very widespread and used to be standard practice, under the excuse that you should use chmod to control access, and that access to the encrypted file probably comes with access to the key since they both have to be present on the same device. One old example: fetchmail One new example: kodi/xbmc