GPG Archives

Create an encrypted archive with gpg:

tar czvpf - file1.txt file2.pdf file3.jpg | gpg --symmetric --cipher-algo aes256 -o myarchive.tar.gz.gpg

And extract it with gpg:

gpg -d myarchive.tar.gz.gpg | tar xzvf -

7zip

Make archive:

7za a -tzip -pPASSWORD -mem=AES256 archive.zip file1 file2

Note that people can still see every filename in your archive, and can change those files.

Unzip:

7za e archive.zip