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Encrypt

  • Decrypt file1.txt.gpg with the password ocfdecal (for real-life purposes, never store passwords in plaintext). What are the decrypted contents of file1.txt.gpg?

    command gpg -d file1.txt.gpg quack

  • What command allows you to import a key?

    gpg --import

  • What command allows you to export a key to a file? (Add the --armor flag to ASCII-encode the key so it can be sent easily in text form)

    gpg --export --armor

  • What command allows you to see all of the keys on your keyring?

    gpg --list-keys

  • Use the private key lab7privkey to decrypt the file file2.txt.gpg (for real-life purposes, it is necessary to keep private keys secret). What are the decrypted contents of b8/file2.txt.gpg?

    gpg --import lab7privkey 
gpg -d file2.txt.gpg

Hashing

md5sum file3.txt ddbefc9c1d8a8d9195a420a7181352e9 file3.txt

md5sum file3.txt | cut -d ' ' -f 1 | sha1sum 15c3d7fa41fcc2ed98c2fda065e3248047a048f4 -

file permission a: file owner, group, people not in the group u: file owner g: group o: other people who are not in the group

Make this file executable and execute it. - chmod u+x file5

change file to be under my permission:
- chmod code_server file6.txt

Make this file readable only to you. What command did you use? - chmod u-r file7.txt

Change this file’s permissions such that only root should be able to read this file and no one should be able to edit it. What command did you use? - chmod a-rwx file8.txt

Choose any method to make this file readable to you and unreadable to the previous owner. What command did you use? - change the ownership, and chmod o-rwx file9.txt

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