Cryptography

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cryptography (noun). The discipline concerned with communication security (eg, confidentiality of messages, integrity of messages, sender authentication, non-repudiation of messages, and many other related issues), regardless of the used medium such as pencil and paper or computers.

This community is for links about and discussion of cryptography specifically. For privacy technology more generally, use !privacy.

This community is explicitly not about cryptocurrency; see !crypto for that.

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How to implement a secure Microsoft Recall alternative? (lemmy.one)

submitted 3 weeks ago by [email protected] to c/[email protected]

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So, I've had a bit of a stupid idea for my next programming project, which would be implementing a Microsoft Recall alternative for Linux where the data is encrypted. I've now written a bit of code and have come to the point where I'd need to encrypt the files. My plan was to use asymmetric encryption where the secret key is again encrypted using something like AES and the user needs to decrypt the private key to view the screenshots taken / data extracted from the screenshots.

I have now learned that asymmetric encryption is very slow and it's generally not designed to encrypt large chunks of data, so I'm not sure how to continue. Do you think asymmetric encryption is feasible for this? Any idea how else to do the encryption? Ideally I would like for the server that takes the screenshots to not have a key that can decrypt the files since that wouldn't be as secure.

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[–] [email protected] 1 points 3 weeks ago (1 children)

Unless you're constantly running a secure overwrite of your free disk space, ram and CPU caches, no data is truly temporary. There is always a possibility for recovery by a skilled enough adversary.

[–] [email protected] 1 points 3 weeks ago

Well yea that's the point: unencrypted recall database would make this sooo much easier.