I want to encrypt a folder by encfs or ecryptfs in linux. I can do it, but i want just specific process can access to it and decryption accrues automatically for that process. No key to encryption needed by process. Can any help me?
decrypt a file only for specific process in linux automatically
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File systems are made exactly for the idea to allow access for more than one process. To want to restrict this access now to only one process is somewhat the opposite of this idea, so it won't be smooth, however you solve your task.
A much more straight-forward way if you want just one process have access would be to not use a file system but a database or just the contents of a single file. This way it would be easy to restrict the access to exactly one process.
If you want to stick to the encfs (or similar) you could let the process run as a specific user which should be the only user to have read and execute permissions on the mounted file system's root.