that would do it... but only the user could check the validity. On Tuesday, April 28, 2015 at 3:19:03 PM UTC-7, Niphlod wrote: > > I meant an hmac with the user supplying the key, of course. That puts you > on the safe-side of db admin tampering. > > On Tuesday, April 28, 2015 at 11:32:47 PM UTC+2, Derek wrote: >> >> I'd have to agree, put the user account (email, username, whatever) and >> the fields all together, calculate hmac on that, and store it. If someone >> changes the data, the hmac won't match and you'll see it's not valid. Of >> course, an admin could just go in and modify the hmac signature after >> updating the record... so you aren't protecting yourself from a malicious >> administrator with the hmac case. >> >>
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