Encriptação de ficheiros

Here's a few ways to do this. One thing to note is that if you're going to use separate compression and encryption tools you should always compress before encryption, since encrypted data is essentially non-compressible.

These examples compress and encrypt a file called clear_text.

Using gpg

$ gpg -c clear_text #Compress & Encrypt
$ gpg -d clear_text.gpg #Decrypt & Decompress

gpg will compress the input file before encryption by default, -c means to use symmetric encryption with a password. The output file will be clear_text.gpg. One benefit of using gpg is that is uses standard OpenPGP formats, so any encryption software that supports OpenPGP will be able to decrypt it.

Protecção de ficheiros com password

zip --encrypt file.zip files

Method Three
Another way to create a secure zip archive is to use GnuPG's symmetric key encryption.

To create an encrypted compressed tar archive with GnuPG:

$ tar czvpf - doc.pdf doc2.pdf doc3.pdf | gpg --symmetric --cipher-algo aes256 -o secure.tar.gz.gpg

To uncompress an archive file encrypted with GnuPG:

$ gpg -d secure.tar.gz.gpg | tar xzvf -

it.log