I'm designing a document management system where customers can upload various types of files such as invoices, receipts, images, and videos. I've been reading up on encryption, but I'm a bit lost. I need to understand how to ensure that only my customers can access their specific data. How can I manage client keys, and what does that process look like? My main goal is to prevent anyone, including us or other customers, from accessing individual customer data.
2 Answers
A straightforward approach is to use client-side encryption. You might also consider SSE-C (Server-Side Encryption with Client-Provided Keys), where customers upload files with their keys, keeping them as the only ones capable of decryption. Just keep in mind that this might add complexity for your customers during the upload process. You might also want to think about using separate buckets for each customer or even different AWS accounts to enhance security.
To make sure that neither you nor anyone else can access your customers' files, you need to let them control the key material. They'll have to encrypt their files with their unique keys, and then you can store those encrypted files. This way, only they can decrypt and access their data.
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