Sharing Files Securely with External Parties

["Knights, John" <knightsj () WIT EDU>]

We have a couple techniques for sending/sharing files securely with internal and external parties, but they are not 
user-friendly for non-technical users.

We are looking for a good service that the average user can use to securely share/send files with external parties, 
preferably one that does not require the outside party to sign up for a service or create an account? For example, we 
could use OneDrive for Business, but it requires the recipient to have a Microsoft account to access the file unless we 
set it as an open link. At least that is how their support site describes how it works.

Thanks,
John