QUICK INFO:

• Symmetric encryption: single key; must be sent to receiver.

• creating a text file from the Terminal: 

  • echo "Text included in the file" > file1.txt
    

• command for symmetric encryption of file: 

  • gpg --symmetric --armor --cipher-algo AES256 file1.txt
    

• command for decryption of file: 

  • gpg --decrypt file1.txt
    

• command for encryption of multiple files in an archive: 

  • tar -czvf - file1.txt file2.txt file3.txt | gpg --symmetric --armor --cipher-algo AES256 --output name-of-archive.asc