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by betterunix 4764 days ago
One of the problems with cryptography is that "solutions" are not as generally applicable as one might want. There are a lot of assumptions that are made, and violating those assumptions is usually a disaster.

For example, when it comes to encryption, it is typically assumed that all messages are the same length. If your application does not make this guarantee, encryption may not provide you with any security. You could wind up in this situation:

https://news.ycombinator.com/item?id=2661890

Think of it this way: asking for a list of tried-and-true crypto solutions is like asking for a list of tried-and-true database schemas. There might be cases where it will work, but for the most part you need to put some thought into what you are doing.
1 comments
normalfaults 4764 days ago
That makes sense in terms of no standard libraries. But how about design patterns for common scenarios, eg. securing REST apis, User authentication/Login/Signup, Payment information handling etc, all in one place.

Does it become less secure if everyone follows standard design patterns?

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betterunix 4764 days ago
No, of course it does not become less secure. In the worst case, slapping some crypto onto a system would have no effect at all; it is hard to see how it could make things worse, other than to give people a false sense of security.

An example is Hushmail. Your mail is signed, it is encrypted, you're using the tried-and-true PGP...and the DEA can walk into court with a pile of DVDs full of the plaintext of some defendant's email. Hushmail is, at best, only marginally more secure than GMail.

So while we might come up with good practices for using cryptography, it is inevitable that organizational practices will render the cryptography pointless. Solutions need to be tailored to the specific needs of an organization or a system. That is where the real problem lies: we do not have something like SQL for cryptography. We do not have a good way to specify organization needs and design (or even verify the security of) a cryptosystem that meets those needs.

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