FerroCrypt

FerroCrypt encrypts files and folders into a single .fcr file.

Choose how to protect your data:

- Password: use the same password to encrypt and decrypt.
- Key pair: encrypt with a recipient's public key. Decryption requires the
matching private key and its password. The app can also create key pairs.

FerroCrypt uses standard, widely reviewed cryptography: XChaCha20-Poly1305
encryption, Argon2id for passwords, X25519 for key pairs, and HKDF and HMAC
with SHA3-256. Any change to an encrypted file is detected when you decrypt
it. The file format is openly documented, and the source code is published
under the GPL-3.0 license.

Encryption leaves the original files in place. File contents are processed
in chunks, so an entire file does not need to fit in memory. A password is
processed with 1 GiB of memory for a few seconds, which makes guessing it
slow and costly for an attacker.

The app can open files in your home folder. To use files on USB drives and
other removable media, run:
sudo snap connect ferrocrypt:removable-media