You must consider your data that is either
- Stored. Here you only want authorised people to access and for it to remain uncorrupted and unchanged over time.
- In transit. This can be over a network (wired or wifi), vpn, by email, file transfer or even a disc in the post. In this case you don’t want anyone except the recipient to read or change it in any way.
Hard disk encryption software that meets commercial confidentiality standards is easily available (eg ESET) . Such software can encrypt a whole or part of a hard drive and attached devices like usb. In addition, individual files can be encrypted before transmission.
Email systems like Office 365 are encrypted but webmail can be more open. For example Google scan emails to enable relevant adverts to be shown. One of many solutions is mailvelope:
In order to communicate through encryption, Mailveope seals your message in such a way that only the recipient can access it. You need the so-called “public key” of the receiver so that your message can be encrypted and sent securely.