On May 31, 2013, at 16:01, Alex Kocharin wrote: > If you want small changes in the input to affect all bits in the output, then > yes, that's what good ciphers are doing. If you just want users to clearly > distinguish one value from another, that will do fine. I just hope you aren't > going to use 64bit cipher to ensure unpredictability of ids…
I don't care if someone guesses an id; the resources would be public, like youtube videos or shortened urls. And for any ids that aren't supposed to be public, they'd be properly protected against unauthorized access. > I don't know what base56 is... But you can just use base64. Youtube uses > URL-base64 encoding replacing last two chars with "-" and "_". > > But anyway... mongodb id is 12 bytes. It would be 16 bytes base64-encoded. > That's too long, and I'd very much like to see a solution to create shorter > or more user-friendly ids. > > Did you think about assigning auto-incrementing number to a message? Or a > string like "user_number"? Or whatever... mongodb _ids are very much > necessary, but they don't always need to be exposed to user. I have briefly considered that. And using hashids with incrementing integers does produce pleasing short random-looking strings. But mongodb doesn't have an autoincrement feature. They have documentation explaining how to fake it, and why it's problematic: http://docs.mongodb.org/manual/tutorial/create-an-auto-incrementing-field/ -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
