My use of UUIDs as DB keys has nothing to do with security. Just global
uniqueness. The term UUID doesn't imply any security.
On Mon, Aug 6, 2012 at 9:29 PM, Tim Caswell wrote:
> Isaac is correct. Date.now is pretty guessable from a security standpoint
> and so is Math.random. I was suggesti
Axel, that's interesting. I was noticing the same issue, mainly that I have to
create uuid's in batches, in the browser, and Date.now() was not granular
enough, so they were all getting the same prefix. Didn't seem very useful.
Seems like there's no way to create strong, fast uuid's in the br
This is what I do to create compact 96 bit UIDs in a fast way. 4 bits
are per 6 characters but thats ok for me.
var uid = function() {
var mime
='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var ua = [];
for(var a = 0; a < 3; a++) {
var r32 = Math.floo
Isaac is correct. Date.now is pretty guessable from a security standpoint
and so is Math.random. I was suggesting it for cases where that's not an
issue.
On Aug 6, 2012 8:11 PM, "Isaac Schlueter" wrote:
> That looks like I was responding to Mark Hahn's commnet about sorting; I
> wasn't.
>
> Of
That looks like I was responding to Mark Hahn's commnet about sorting; I wasn't.
Of course it's fine to put the date on there *also*, but my point is
merely that (Date.now() + Math.random()) is not sufficiently random to
call it a uuid.
On Mon, Aug 6, 2012 at 6:09 PM, Isaac Schlueter wrote:
> Ma
Math.random() is not cryptographically secure entropy, and Date.now()
is extremely guessable. If you are worried about someone *wanting* to
cause collisions, then that's not so great.
If you don't care about the IETF, and you are writing your program in
Node, then the simplest approach is somethi
The advantage of starting off with the time is that the UUIDs sort by order
generated which is useful for DB ids. Coding a time into base 36 is a bit
dangerous though as it may not sort right at some time in the future. That
time may be centuries from now, not sure. Sorting by hex is known to be
FWIW, here is the code to exactly match couchdb.
UUID = -> '0' + (new Date().getTime() * 1e3).toString(16) +
Math.floor(Math.random() * 1e18).toString(16)
On Mon, Aug 6, 2012 at 3:43 PM, Rick Waldron wrote:
> On Mon, Aug 6, 2012 at 6:28 PM, Mark Hahn wrote:
>
>> That isn't a hack. It is almo
On Mon, Aug 6, 2012 at 6:28 PM, Mark Hahn wrote:
> That isn't a hack. It is almost a copy of what couchdb offers. I use it
> all the time.
>
One is an IETF (RFC) and the other isn't.
http://www.ietf.org/rfc/rfc4122.txt
>
> On Mon, Aug 6, 2012 at 2:17 PM, Ted Young wrote:
>
>> Thanks for th
That isn't a hack. It is almost a copy of what couchdb offers. I use it
all the time.
On Mon, Aug 6, 2012 at 2:17 PM, Ted Young wrote:
> Thanks for the feedback, glad to know I found the defacto solution. Tim,
> that's funny, your hack is more or less what I started with, but I became
> suspi
Thanks for the feedback, glad to know I found the defacto solution. Tim,
that's funny, your hack is more or less what I started with, but I became
suspicious that it was too easy somehow. Maybe I'll switch back to that if
file-size/performance becomes an issue (which it won't).
Ted
On Aug 6,
Depending on how strict your requirements are, I often just use:
Date.now.toString(36) + "-" + (Math.random() * 0x1000).toString(36)
Date.now is unique every ms and Math.random has a keyspace of 2^32, so
collisions are statistically impossible in most practical
applications.
On Mon, Aug 6,
On Monday, August 6, 2012 at 1:38 PM, Martin Cooper wrote:
> On Mon, Aug 6, 2012 at 10:28 AM, Ted Young wrote:
> > Hey y'all,
> >
> > So, I have a need for global unique id's. Googling about, I've found the
> > following implementations that seem decent:
> >
> > https://github.com/broofa/no
On Mon, Aug 6, 2012 at 10:28 AM, Ted Young wrote:
> Hey y'all,
>
> So, I have a need for global unique id's. Googling about, I've found the
> following implementations that seem decent:
>
> https://github.com/broofa/node-uuid
FWIW, this is the package that npm uses.
--
Martin Cooper
> https:/
Hey y'all,
So, I have a need for global unique id's. Googling about, I've found the
following implementations that seem decent:
https://github.com/broofa/node-uuid
https://gist.github.com/1308368
Not really sure why I would pick one over the other (besides file size), or if
there are any js-s
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