https://www.2daygeek.com/zip-7zip-encrypt-decrypt-password-protect-files-folders-linux/
sudo apt-get install zip unzip

# zip --encrypt test.zip test.txt test1.txt
Enter password: ******
Verify password: *****
  adding: test.txt (stored 0%)
  adding: test1.txt (stored 0%)

Details :

zip : Command
–encrypt : To create encryption
test.zip : Zip file name
test.txt & test1.txt : These are files to be encrypted

To unzip encrypted zip file, just run the following command and input the password once.

# unzip test.zip
Archive:  test.zip
[test.zip] test.txt password: ******
replace test.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
 extracting: test.txt
replace test1.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
 extracting: test1.txt

For floder encryption use -r option with zip command. In this example, we are going to create a encrypted zip file called test1.zip with test.txt, test1.txt file & test-dir folder.

# zip -r --encrypt test1.zip test.txt test1.txt test-dir/
Enter password: ******
Verify password: ******
  adding: test.txt (stored 0%)
  adding: test1.txt (stored 0%)
  adding: test-dir/ (stored 0%)
  adding: test-dir/test1.txt (stored 0%)
  adding: test-dir/test.txt (stored 0%)

To unzip encrypted zip folder, just run the following command and input the password once.

# unzip test1.zip
Archive:  test1.zip
[test1.zip] test.txt password: ******
replace test.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
 extracting: test.txt
replace test1.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
 extracting: test1.txt
replace test-dir/test1.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
 extracting: test-dir/test1.txt
replace test-dir/test.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
 extracting: test-dir/test.txt