Some encryption tools are easy to use, others are highly secure. A few, including AxCrypt Premium, hit both targets. You initialize it with a single strong master password, and it takes care of complex tasks like encrypting files using the US-government approved AES algorithm, and sharing those files using PKI (Public Key Interface) technology. Those with whom you share encrypted files need their own AxCrypt account, but they can make use of its free tier.
In some cases, when you attempt to unzip files from (extract) or view files in a Zip file (.zip or .zipx) a Decrypt dialog will display requesting a password. This indicates that the files in your Zip file have been encrypted.
The password for an encrypted Zip file is set by the person who creates the Zip file at the time it is created. It is also possible to encrypt files in a Zip file after the Zip file is created, but again the person choosing to encrypt is the one who sets the password. 2b1af7f3a8