Why Email Attachments Are Risky
Email is one of the most common ways to share files, but it was never designed with security in mind. When you send an email attachment, the file can pass through multiple servers before reaching its destination, and copies may remain on those servers indefinitely. If someone intercepts the email or gains access to either inbox, they have access to the attached files.
For everyday photos or casual documents, email is usually fine. But for sensitive files like tax returns, medical records, contracts, or identification documents, you should use a more secure method.
Encrypted Cloud Storage
Cloud storage services like Google Drive, Dropbox, and OneDrive offer convenient file sharing with built-in security features. To use them securely:
- Share with specific people: Instead of creating a public link that anyone can access, share files with specific email addresses so only authorized people can view them.
- Set expiration dates: Some services let you set links to expire after a certain time, reducing the window of exposure.
- Use password-protected links: Add an extra layer by requiring a password to access shared files.
- Review shared files regularly: Periodically check what you have shared and revoke access to files that no longer need to be available.
End-to-End Encrypted Transfer Services
For the highest level of security, consider services specifically designed for secure file transfer. These services encrypt your files on your device before uploading, meaning even the service provider cannot read your files. Some options offer features like:
- Automatic file deletion after download.
- Password protection for each transfer.
- No account required for the recipient.
- File size limits that accommodate large documents.
Sharing Within Your Organization
If you are sharing files at work, use your organization's approved tools rather than personal accounts. Most companies have specific platforms and policies for file sharing that comply with security requirements. Using personal cloud storage for work files can create compliance issues and security risks.
Practical Tips for Secure Sharing
- Before sharing any file, ask yourself: does this file contain sensitive information? If yes, avoid plain email.
- Use cloud storage sharing features instead of downloading and re-uploading files.
- Communicate passwords through a separate channel. For example, send the file via cloud storage and the password via text message.
- Delete shared links after the recipient has downloaded the file.
- Encrypt particularly sensitive files with a password before uploading them anywhere.
A Quick Guide to Choosing the Right Method
- Casual files (photos, recipes): Email or any cloud service is fine.
- Moderately sensitive (work documents): Use cloud storage with restricted sharing settings.
- Highly sensitive (tax records, IDs, medical): Use an end-to-end encrypted transfer service with password protection.
Sharing files securely takes only a little extra effort, and it can prevent significant problems down the road. Choose the right tool for the sensitivity of the content, and you will be well protected.
