Encrypt Archive.zip saving as Archive.zip.dat, you'll be prompted to enter a password and confirm it
openssl enc -aes-256-cbc -in Archive.zip >Archive.zip.dat
Decrypt Archive.zip.dat saving as Archive.zip, you'll be prompted to enter the password you used to encrypt it
openssl enc -aes-256-cbc -d -in Archive.zip.dat >Archive.zip