Local archive encryption Android: OpenKeychain or Ghost Commander?

Questions
1

Hi,

I’m looking for a tool to encrypt an archive (document backup).

Criteria :

  • free and up-to-date
  • APK file available in a repository
  • generates a single output file

I’ve seen several apps:

Cryptomator can encrypt files locally. But: paid on Android (€20???), splits the file into several smaller ones (which is fine for the cloud but takes too long to copy locally to external media). Also, I prefer to use a single file to verify its integrity.

DroidFS : like Cryptomator, generates small files.

Linux terminal (Android 16) with gnupg in the cli: does not allow you to manage files larger than about 1.5 GB.

OpenKeychain has not been maintained for some time and has not updated its version of gnupg. However, it can encrypt a local file with a symmetric key. I’m neither a developer nor a cryptology specialist, so I don’t know if it’s still secure enough.

Ghost Commander allows you to create zip files encrypted with AES. Likewise, I don’t know if the implementation is correct. I saw the file containing the encryption functions on the website: Crypte.java
It seems to use 128 instead of 256, but when testing the file after encryption (for example, with 7zip), it does indeed indicate aes-256.

I’m therefore hesitating between OpenKeychain and Ghost Commander. In your opinion, which is the most secure tool for locally encrypting an archive?

Thank you in advance for your answers.

Ps : message edited to make my criteria clearer

2

Please search the forum.
DroidFS would be a more appropriate tool for this.

1 Like
3

Thanks @SkewedZeppelin for your reply.

I’ve also looked at DroidFS, but as written, “I prefer to use a single file to verify its integrity.” It’s also easier for copying to external storage.

For the forum search, I’ve already done some research, but maybe I didn’t use the right keywords? Do you have links for Ghost Commander and Aes-256, please? (Sorry, English is not my native language.)

Thanks in advance.

4

I always use Picocrypt CLI via Termux in situation like this, it even handle of 3 GB without any issues. Although the project was archived recently, but I haven’t encountered any problems so far.