Ask HN: Are some signup CAPTCHAs becoming a bit ridiculous (yes you HN)?

37 pointsby bitmilitiavor 12 Jahren56 comments

My friend showed me this after trying to sign up for HN. There’s now a Capcha when you sign up which is more than difficult to answer... mostly because the text is so difficult to read it doesn't look like english. Not sure if the intent is trying to stop bots or trying to stop anyone who doesn’t want to spend 10 guessing characters. Oh, and think the text CAPTCHA is hard… listen to the audio puzzle (get your pen and paper ready).

19 comments

krappvor 12 Jahren

It seems to me that any captcha worth breaking is already "broken", given the existence of captcha farms - and I put broken in quotes because technically, with captcha farms, the captcha is working as designed, you're just paying human beings to break them. The assumption, of course, that there is necessarily a difference between a "spambot" and a "human being" is not as true as it used to be.

Even so, the constant war of escalation between captchas and anti-captcha measures should eventually lead to the necessity to create a captcha which is impossible for most humans to decipher, once the capability of software to decipher them passes baseline human ability. At that point, just being able to solve the captcha would more or less prove you're probably not a human being. So the basic model of "text a human can read but a computer can't" is probably obsolete, and only still works due to the inertia of programmer laziness, and the fact that breaking captchas probably doesn't have a ROI worth the trouble for most sites.

Constructing more subtle captchas present their own problems, in that they can make cultural assumptions about the user. If you're also using the captcha as a community filter, this may be a feature though (for instance - having a site about anime set up a quiz about anime as a captcha, or having users solve complex programming puzzles.) Even so, any process which a human can perform through rote UI can be automated, so even those tests will fail. Most captchas are poorly designed and leak their solutions one way or another anyway. I've even seen a few posted here which seem to add their solutions in plaintext to the form as a hidden field or something.

I haven't got a clue what Recaptcha can be replaced with once it's thoroughly useless, but i've come to believe that captchas are one of those things it's impossible to do correctly, just adequately most of the time.

nmcvor 12 Jahren

> any captcha worth breaking is already "broken", given the existence of captcha farms

Yes, but there remains a cost. The goal of a security measure is to make it so difficult/expensive that it becomes worthless doing.

shubhamjainvor 12 Jahren

This is like saying we should stop locking our doors because every door can be broken by a locksmith anyway. The purpose of captcha is not to break any attempts of automation but only to make it more harder. Considering that automating a script to break captcha with human intelligence / automation is not trivial by any means I think, they serve their purpose.

Xenmenvor 12 Jahren

The issue is that, given a little more time, we'll see a "one-size-fits-all" captcha breaker, one that needs little to no modification to break the captcha on new sites.

krappvor 12 Jahren

A captcha is better than nothing.

dangvor 12 Jahren

The captcha on HN is temporary. We put it up to mitigate an attack while implementing a longer-term solution. Sorry for the inconvenience.

If we ask nicely, perhaps kogir will show up to say more.

jcrvor 12 Jahren

There's a much better solution than a CAPTCHA, but when SN/HN was started, it wasn't as simple or easy to do. The answer is to simply require a tiny donation like one to five dollars to a charity (like Watsi) or non-profit organization (like the EFF).

YC now has (at least) two payment processors who could handle the transactions, either in real currency (Stripe.com) or virtual currency (Coinbase.com):

http://stripe.com

http://coinbase.com

The payment processors will always have upstream fees that need to be paid, but if they're feeling generous, they could waive their profits on the donations.

If for some reason a person objects to donating to the EFF, then just give them a choice of charities, including the YC funded Watsi.org:

http://ycombinator.com/watsi.html

https://watsi.org/

The altruism would also be good promotion for YC, Stripe, CoinBase, Watsi, and whoever else is involved.

If you want to give a break to the starving university students, then let them by-pass the donation requirement with an *.edu email address.

To keep everything fair between new and old users, the tiny donation could be an annual requirement. I sincerely doubt the kinds of hackers who want to contribute to technical discussions will have any problem with making a small contribution to one of many known-good charities.

tptacekvor 12 Jahren

I like this idea a lot, but it won't work in practice without killing off serendipitous contributions from people associated with stories here that happen to find out about HN and join just to answer questions. That happens a lot, and it'd be a shame if we killed it off.

jcrvor 12 Jahren

That's a huge and important point. We all love to see the contributions from the people associated with the stories (well, I should only speak for myself, but it's seriously one of the best parts of HN).

Using an eventual required donation in conjunction with an initially usable account (e.g. allowing "X" days/comments/submissions before requiring a donation) might be able compensate, but it would not solve the underlying CAPTCHA, drive-by trolling, or spam problems.

It seems safe to assume the increased friction of requiring a tiny $1-5 donation (micro-payment) to a good cause will reduce the desired and beneficial contributions from people associated with a submission.

The tough question is, "By how much?"

It would be difficult to measure when associated people show up to add their contributions to relevant submissions. It would take just about all of the data on HN, and some very elegant code. The results would still be imperfect, but the results might still be useful. Even if actual measuring proves to be too difficult, a rough guess (opinion) of better/worse for before/after could still be useful. (Heck, removing per-comment karma scores "worked" to reduce hostility/competition even though we don't have any solid measurement data to prove it)

And the tougher question is, "Are we sure?"

Contentious comments (dumb/mean) have always been a problem in open discussion systems, and similar is true for abusive manipulation (spam, ring-vote, ring-flag, etc.). Having a gate of an act of altruism could also both assure intent/interest and improve quality enough to actively encourage associated people to consider commenting to be even more worthwhile than it currently is.

In other words, there's also a second less obvious safe assumption; we're far more inclined to join a good discussion on a topic of interest than a bad discussion on the same topic.

Without testing, we just won't know if the added friction of a required donation would be overall harmful, or overall helpful, or roughly even. Prior to Stripe/CoinBase/Watsi/... the idea of requiring a tiny donation just wasn't feasible, but now, it might be an experiment worth running.

But the toughest question is, "How much will it hurt to try?"

If it really did kill off contributions from associated people, then it would certainly need to stop, but other than the possible temporary reduction of associated contributions (which could be reversed), I'm unable to see any other real or lasting harm. Even if requiring a tiny donation turned out to be a totally failed experiment in forum design, it would still do some good in the world.

You might be totally right and it might fail in practice, but until we run the minor risks of actually testing it, we'll never really know.

[deleted]vor 12 Jahren

danielwebervor 12 Jahren

A viciously mean CAPTCHA can be worse than saying "we aren't allowing new accounts right now, sorry."

https://www.google.com/recaptcha/api/image?c=03AHJ_Vutw8XwYq...

You can get so aggressive against new hostile users that you end up being downright hostile to new legitimate users.

For example, automatically marking posts from new users as [dead] without telling them is assuming that they are all bad people. If new accounts making new posts is a problem, then disable it -- don't let innocent new users make new posts and lie to them that they made their post when no one else can see it or comment on it.

I know this job is hard. I request that you simply turn features off instead of silently breaking them.

dangvor 12 Jahren

I only saw this now:

> automatically marking posts from new users as [dead] without telling them

HN definitely does not do that.

stucco33vor 12 Jahren

Have you seen FunCaptcha? It's a visual CAPTCHA that has really thought about how to stay secure. It's got solid testimonials from peeps who know the tech side well. It's also super easy to complete.

qnaalvor 12 Jahren

THAT'S WHAT MOOT SAID

krappvor 12 Jahren

This isn't 4chan. If you're running a site which allows unmoderated anonymous content, including images, a captcha is probably a good idea. Not necessarily an effective idea, but a good idea.

Vanitvor 12 Jahren

Okay, you win HN, I created an account because the anti-captcha crowd is missing the point.

There's a current bug in Recaptcha.

IPs that successfully solve too many captchas get given progressively more difficult challenges, which is fine, but currently Recaptcha is using the IP of the web servers, not the client. This means that the difficulty ramps up for all users quite quickly. It seems the iframe Recaptcha is permanently affected, if you use AJAX its fine after the first reload (I wrote a simple JS hack that makes it reload the first time, see www.mPoll.me)

Only noticed it because I was previously proxying Recaptcha through the server and it run its successful solutions up too high, so when the new bug came in it was immediately obvious what had happened when the first challenge is "wthdyjikhgfyijv" and on reload its "fluffy bunny 18".

On my website I'm currently overwriting the Recaptcha callbacks to allow multiple captchas, just put in a simple check to reload it the first time:

    var reloaded = false;

    function reloadCaptcha(challenge) {
        $(':input[name=recaptcha_response_field]').val('');
        $('img.recaptcha').attr('src', '//www.google.com/recaptcha/api/image?c='+challenge);
        $(':input.recaptcha').val(challenge);

        if(!reloaded)
        {
            reloaded = true;
            Recaptcha.reload();
        }        
    }

    Recaptcha.finish_reload = function(challenge,b,c){
        reloadCaptcha(challenge);
    }

    Recaptcha.challenge_callback = function(){
        reloadCaptcha(RecaptchaState.challenge);
    }

    Recaptcha.create(recaptchaKey);

codemonkeyismvor 12 Jahren

For a throwaway account recently it took me >20 tries to register an HN account.

asdfasdf23sddvor 12 Jahren

Did it on my second try -- I, personally, don't think it's so bad. I thought it was a bit crazy when I first looked at it but if you look hard enough, you can make the letters out. I am not sure what the idea is behind the "challenge text" though.

KhalPandavor 12 Jahren

Most CAPTCHA's nowadays I find unnecessarily complex. Use tricks like timing form completion (<50ms? Bot), hidden fields, etc, before ruining the UX with CAPTCHA.

Then again... does HN really care about UX? Token expiration after x time when browsing through the listings, ancient unresponsive design, etc.

There comes a point where it'll be more cost effective for spammers to just farm out the solving of CAPTCHA's to people in third-world countries. It just depends if there is enough value in spamming HN for them to bother (probably not, given the user-curated-and-rated content model.

jaredmcateervor 12 Jahren

Timing form completion also rejects legitimate users that have form filling extensions (e.g., LastPass, 1Password, Roboform, etc.) In my experience hidden form fields were only marginally effective, a lot of bots run headless browsers capable of detecting if a field has been hidden by JS/CSS

timrvor 12 Jahren

Between a simple captcha and a CSRF token, I've found that nearly all spambots are defeated. Hidden form fields don't do much, since bots are almost never paying attention to anything other than the DOM.

What can work well -- if you're willing to give up on fallback for non-JS users -- is inserting a required form element into the page with JS on submit.

cottonseedvor 12 Jahren

The Facebook account delete CAPTCHA was literally impossible. I had to give up and use the audio option. Every step of the process made me happier I was doing it.

DanBCvor 12 Jahren

Here is the best (most readable) Facebook captcha I had.

http://imgur.com/P7nln3d

carsongrossvor 12 Jahren

I don't know that the research says about their effectiveness (hard to find through all the stuff on google) but I've liked the slider-based captchas I've seen:

http://www.3dcaptcha.net/

Seems promising given that human visual processing and pattern recognition are lightening fast, and the slider is intuitive and kinda fun.

Anyone know how effective they are at stopping bots?

simcop2387vor 12 Jahren

If you can end up getting a polygon list from it I'd think it wouldn't be very effective at all. it looks like it decomposes the triangles onto multiple planes so that they only line up when rotated one way, but you can calculate that rotation based on the rotation of the planes that the polygons are on. Even if they correct that, you'd still likely be able to find whatever image has the lowest amount of white pixels (or whatever the background is) and probably do a reasonable job at least with the example on the page.

vitdvor 12 Jahren

I get no catpcha - just "Missing PlugIn". So not very useful for a human.

fredstedvor 12 Jahren

Adjust the slider progressively, compare pattern to surrounding images. Or just brute force it. I'd give it a couple days before it would be botted on a large target like gmail or Facebook.

iaskwhyvor 12 Jahren

I tried the demo on the site, it would have been very effective at stopping me because of the required precision. I avoid pixel hunting as much as I can. How acessible is this?

jbb555vor 12 Jahren

There have been several websites recently where I've given up because after 10 attempts or so I still can't get the capcha right.

qguvvor 12 Jahren

Perhaps you're not human after all…?

danielwebervor 12 Jahren

HN gave me this image just now:

https://www.google.com/recaptcha/api/image?c=03AHJ_Vutw8XwYq...

larrysvor 12 Jahren

I sometimes think that people don't really give much thought to some of the things that they do where they simply copy what others do.

My own personal pet peeve is people, on HN, who obscure their gmail address so that it can't be slurped by bots.

I mean why not just use a dedicated gmail account, just for HN, rather than "use my hn handle at that email service that everyone else uses generally". The dedicated account has spam protection and you can forward mail to your primary account as a filter if you want.

I have a couple of web forms with no spam protection at all. The amount of bots that I get isn't so great that I need to trouble people to figure out a captcha. Much less a really difficult one.

bradleysmithvor 12 Jahren

>why not just use a dedicated gmail account, just for HN, rather than "use my hn handle at that email service that everyone else uses generally". The dedicated account has spam protection and you can forward mail to your primary account as a filter if you want.

Because starting, configuring, and checking ANOTHER gmail address takes more time and effort than obscuring my current dev-related email address to be human parse-able only. Seems like a strange thing to have a pet-peeve about, as it could only barely affect your ability to get in touch with these people. Unless, you've been trying to slurp email addresses from HN profiles... I could see it being bothersome in that case.

larrysvor 12 Jahren

"and checking ANOTHER gmail address"

If you forward it it's not another account to check though. Sure you have to set it up.

Also, obscuring it doesn't prevent someone who has written to you having a situation where your email ends up in the wrong hands (for sure you've received, if you don't have spam protection, those emails where someone who has emailed you has had some virus which gets all their email contacts, right?)

If you setup a dedicated gmail you can periodically change that as well "refresh" using your own email you can't do that.

To be sure though the pet peeve is really more just thinking that people are being overly hygienic about protecting their email address I guess. You are right that it's not a huge burden on someone who is sending you an email.

When I used to post my gmail account to my HN profile gmail caught all the spam it wasn't a problem (maybe this was for a year or year and a half that it was in the profile..)

bradleysmithvor 12 Jahren

I'll concede, I'm a little under-protected when it comes to spam in my email, and sectioning my usage out to different emails would probably be a very big improvement upon that.

Still, this ought be more a pet-peeve for myself. I can't see how obscuring my email would bother you, except perhaps in the line of thought that you think it does NOTHING to avoid spam, and I am just wasting a tiny amount of everyone's time by having them parse it while not benefiting personally. I figured if there was ever a profile a geek would write a scraper for, HN would probably be it. It was a single line of defense I saw others use, and adopted.

Appreciate the conversation. The mostly undiscussed behavior of email format preference in HN profiles is something that has always strangely held my attention; I consider myself a geek for micro-behaviors in this and most any community though.

dennisgorelikvor 12 Jahren

Why don't you include your gmail into your HN profile anymore?

Does it mean you don't want us to contact you?

stevekempvor 12 Jahren

I run a site which provides an API for real-time testing of spam vs. ok submissions for blog comments, forum posts, and contact-forms.

I handle about 250,000 submissions a day.

Contact-forms can easily be overwhelmed with spam, it's just a matter of how lucky you are, or not.

larrysvor 12 Jahren

"it's just a matter of how lucky you are, or not"

Any factors that you have been able to determine that quantifies why someone is lucky or not?

stevekempvor 12 Jahren

I suspect the submission of spam correlates to your traffic, more than anything else.

I have some sites with a "contact me" form which get hammered, and others that get one or two hits a month.

(Adding simple captchas, or hidden fields, etc, can work at the low end. The ones that get hammered though have bots/people that deal with that.)

andyhmltnvor 12 Jahren

Just today I found this:

https://www.sublimetext.com/forum

Incredibly frustrating. A CAPTCHA that requires you to email for the code

kogirvor 12 Jahren

We're just using the standard reCAPTCHA (https://www.google.com/recaptcha/intro/index.html). Maybe they're harder because I don't trust third party javascript and use the iframe version instead?

It sucks, and will shortly go away for most users. When previously our code would refuse or tell you to try again in a few hours, the captcha will be required instead.

jasonlotitovor 12 Jahren

> Not sure if the intent is trying to stop bots

CAPTCHA does not stop bots. Captcha solving can, at the very least, be automated away. CAPTCHA's do not work.

ryanburkvor 12 Jahren

google security did a nice blog post supporting the statement that CAPTCHAs aren't as effective as they used to be:

http://googleonlinesecurity.blogspot.com/2013/10/recaptcha-j...

thewarriorvor 12 Jahren

Some random ideas which I know are not perfect just putting it out here :

Taking an image and turning into a jigsaw puzzle.

Using a proof of work scheme similar to bitcoin.

Do a google image search for say fish . Take 5 of those images and put them on one side put two on the other alongside images of 10 other random objects. Ask the user to pick the two on the right similar to the ones on the left.

Matheo05vor 12 Jahren

Try the audio version, it's even worst!

fredstedvor 12 Jahren

May I suggest an alternative: paying a small fee to avoid/replace captchas (say $1-10, or higher than the captcha farms pay...)

Also it seems like HN is using the older recaptcha (without numeric signs), I didn't know you could choose your recaptcha "version" though.

Glyptodonvor 12 Jahren

You may if you feel like paying every person on earth $500 a month to cover their captcha fees. Unless your goal happens to be excluding most of the world from Internet services and random web forums.

fredstedvor 12 Jahren

I don't know where you got that number from, that's extreme. This is a one-time fee we're talking about here. Also why should I pay anybody? Strange reply.

maxbrownvor 12 Jahren

I think it was a strange way of saying that $1-10 may not be cost-prohibitive to financially-comfortable residents of 1st world countries, but could certainly be cost-prohibitive to users with less financial resources or from 3rd world countries. Such a fee could be a serious deterrent on a free and open internet with diverse participants.

ing33kvor 12 Jahren

HN uses reCAPTCHA, it can be bit frustrating sometimes. but its one time thing to get in .

karangoeluwvor 12 Jahren

I tried to solve the HN captcha. It's almost impossible and you have to get really lucky that you get an easy image. The audio alternative is pretty messed up too.

codesuelavor 12 Jahren

are you using TOR or any other IP masking solution? The more reCaptchas get solved or requested by a particular IP the harder they become, so if you are behind a IP that has been used for solving/requesting a lot of reCaptchas it is close to impossible to get a readable one (took me about 80 tries till I got one right when I used TOR). I don't know what exactly determines this difficulty but it is definitely there and Google talks about it here: http://googleonlinesecurity.blogspot.de/2013/10/recaptcha-ju...

xacaxuluvor 12 Jahren

If you like the image, just wait until you try the audio! Even more fun.

unwindvor 12 Jahren

Is the actual link missing? Not sure where I'm supposed to look, anyway.

ozhvor 12 Jahren

https://news.ycombinator.com/logout then https://news.ycombinator.com/newslogin I guess

karangoeluwvor 12 Jahren

https://news.ycombinator.com/newslogin

The captcha is actually pretty ridiculous.

jcfreivor 12 Jahren

IMHO visual/audio recognition based CAPTCHAs are a dead end.