Add encryption

[woheller69]

With this library https://github.com/srikanth-lingala/zip4j it should be fairly simple to create encrypted zip files on the fly.

See section Creating a password protected zip file in Readme

Maybe an idea for a future enhancement

[serrq]

To understand:

1. I create an encrypted zip file within Filester
2. Share the password with my recipient in other messaging channels
3. The recipient download the encrypted file

Do I understood properly?

[woheller69]

Exactly, that is the idea. Data in a cloud should never be unencrypted

[serrq]

Yes, I think the same. Never unencrypted, in transition and at rest (when the file is stored in the cloud).

[roozbehzarei]

Thank you for the suggestion. I will definitely add this feature sometime in future (when I find some free time).

Yes, I think the same. Never unencrypted, in transition and at rest (data).

Since Filester is connecting to the server using HTTPS protocol, all transition is encrypted by default. All that remains is to encrypt the file itself for extra security when it's stored on the cloud.

[serrq]

I mean the file encrypted locally before sending. The network encryption is another thing.