CODEWITHSUNDEEP
securityhtmlofflineapps
user317077
user317077

Reputation: 184

HTML5 Web DB Security

I'm looking into an offline web app solution using HTML5. The functionality is everything I need BUT the data stored can be directly queried right in the browser and therefore completely unsecure!

Is there anyway to encrypt/hide so that the data is secure?

Thanks, D.

Upvotes: 14

Views: 21810

Answers (3)

Cbe317
Cbe317

Reputation: 1219

You can also see an article on this concern by the author of the HTML5 SecureStore Porposal

Upvotes: 5

Warty
Warty

Reputation: 7395

If you're storing data on the user's computer, the user can always read it, no matter how much you encrypt it [assuming you aren't using a hash...]

Sensitive data goes on the server-side, always.

Upvotes: 2

Sripathi Krishnan
Sripathi Krishnan

Reputation: 31528

There are two concerns to local storage in HTML5 -

  1. One website reading offline data that another website has stored in a users browser
  2. An end user querying your websites offline data directly

For 1, browsers enforce the same-domain restrictions to localStorage (or the sqllite database support that safari has), so other websites won't have access to the data that you store. However, do remember that if your site has XSS vulnerabilities, it would be possible to steal the data.

For 2, you can't prevent it. Its just like a cookie - the user can chose to view/delete/modify it.

Encryption of data is possible (see http://farfarfar.com/scripts/encrypt/), but pointless. You cannot have a single, global key/password - because an attacker can easily figure the key from javascript code. Using a user-entered password to encrypt/decrypt is possible, but client-side encryption libraries aren't mature or tested well enough. There are likely tons of way to break it.

So, for now atleast, don't store sensitive data in localStorage.

Upvotes: 20

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