Web aplikacije, web servisi i software Frameworks, web servisi, programi, plugin-ovi, ekstenzije korisni za razvoj web sajtova. Sponzor: |
|
Alati teme | Način prikaza |
|
18. 03. 2007. | #1 | |
Designer guy
Wrote a book
|
Asirra
Citat:
Vaše mišljenje? Ima li ovo kakvu budućnost (i ima li je CAPTCHA uopšte)? |
|
18. 03. 2007. | #2 |
majstor
Wrote a book
|
Vidio sam vec nesto slicno ovome, nisam siguran da se ovako zove. Captcha je mnogo jednostavnija, ovo mi bas zvuci smor i komplikovano, pogotovo sto ne mozes brzo uraditi, slike su suvishe malene i ako captcha ima problema sa disable-ovanim images i JS, tek ce ovaj sistem imati.
Meni je ovo smor, ja bih (da moram) trazio drugo rjesenje. |
18. 03. 2007. | #3 |
Direktor Kombinata
Invented the damn thing
Datum učlanjenja: 07.06.2005
Poruke: 2.669
Hvala: 44
119 "Hvala" u 64 poruka
|
Naletao sam na ovo ranije, ali sam mislio da je u pitanju igra tipa "razvrstaj priorodne i sa silikonima" (beše link za ovo na DPT), samo za malo mlađu publiku...
__________________
activeCollab - Project Management and Collaboration Tool iz domaće kuhinje | area51.rs - Blog |
19. 03. 2007. | #4 |
Ivan Dilber
Sir Write-a-Lot
|
po meni je sustina zastite da napravis originalno resenje za svaki sajt, makar i sa vrlo malom razlikom, tipa promenis imena polja... time si automatski odbio 99% posto spam bottova, koji su u sustini veoma glupo pisani.. oni jure poznate metode zastite, i ako ih ne nadju idu dalje..
Meni se licno najvise svidja fora sa laznim poljem: napravis textfield sa imenom email, a u labelu napises "Ostavite ovo polje prazno" (plus sve to sakrijes CSS-om). Apsolutno svaki bot ce pokusati da popuni lazni email, i tako ih se lako resis...
__________________
Leadership is the art of getting people to want to do what you know must be done. |
19. 03. 2007. | #5 | |
Predrag Supurović
Grand Master
Datum učlanjenja: 24.01.2006
Lokacija: Užice
Poruke: 791
Hvala: 3
200 "Hvala" u 12 poruka
|
Citat:
__________________
Peđina beležnica (blog) - www.uzice.net - wireless.uzice.net - www.vokabular.org - www.vodic.net - forum.uzice.net |
|
19. 03. 2007. | #6 | |
Designer guy
Wrote a book
|
Citat:
|
|
04. 06. 2007. | #7 |
Igor Marinović
Expert
|
Danas sam na Diggu naišao na interesantan Captcha test:
Komentare i još primera imate ovde: http://digg.com/offbeat_news/Best_Captcha_Ever_PICTURE
__________________
marinowski.com |
19. 03. 2007. | #8 |
Python Ambassador
Master
|
Off Topic: Heh, u zadnje vreme baš se mislim da mi master rad bude u vezi sigurnosti različith klasa CAPTCHA testova Prednosti: * Teži za računare od tekstualne CAPTCHA-e * Pristojna baza slika Mane: * Kvalitet slika - na nekima je nejasno šta je u stvari na njima - što zbog kvaliteta slike, što zbog same živuljke * Cena - znajući MS ova usluga neće još dugo biti besplatna * Sporo - u odnosu na uobičajne CAPTCHA-e treba dovući 12x više slika * Različitost - pitanje je koliko je vremena prosečnom korisniku potrebno da shvati šta se od njega traži, naročito ako ne zna engleski. * Sličnost - bez obzira na zaštitne mehanizme i ovakav sistem se da razbiti: matematika + dobar AI + bot-net + brute-force + jeftina ljudska radna snaga. Pitanje je samo želje i novca. A da ovaj unos ne bi bio čisto teoritisanje evo malo koda: Kôd:
""" A script for testing Asirra CAPTCHA (http://research.microsoft.com/asirra/) security The idea behind this script is pretty simple: * First, let's say we have a way to learn which animal is on a picture (cheap human labor or AI - neural network). * Then, with the help of this script, we calculate how much of CAPTCHA requests we need to make in order to have a specific amount of animal pictures. * After we have a rough estimate of the needed requests we employ our bot-network to get the pictures. * We classify the pictures using the selected learning algo. * Now we train our Agent (AI) to recognize the rest of unknown pictures. * CAPTCHA PASSED :) """ __author__ = 'Petar Maric - http://www.petarmaric.com/' TOTAL_PICTURES = 2*10**6 # They say "It's powered by over two million photos" PICTURES_PER_VIEW = 4*3 # CAPTCHA test picutre grid is 4x3 pictures # List of how much CAPTCHA requests to make TRIES_LIST = xrange(5*10**4, 5*10**5, 5*10**4) ############################### # You can look, but no touching ############################### import random ALL_PICTURES = xrange(TOTAL_PICTURES) def num_pictures_learned(num_tries): """Returns the number of learned pictures""" pictures_learned = {} for i in xrange(num_tries): for pic in random.sample(ALL_PICTURES, PICTURES_PER_VIEW): pictures_learned[pic] = 0 return len(pictures_learned) def main(): for num_tries in TRIES_LIST: learned = num_pictures_learned(num_tries) learned_percent = 100.0 * learned/TOTAL_PICTURES print "Learned %d/%d (%.2f%%) with %d tries." % ( learned, TOTAL_PICTURES, learned_percent, num_tries ) if __name__ == "__main__": main() Kôd:
Learned 518207/2000000 (25.91%) with 50000 tries. Learned 901901/2000000 (45.10%) with 100000 tries. Learned 1187203/2000000 (59.36%) with 150000 tries. Learned 1396808/2000000 (69.84%) with 200000 tries. Learned 1553736/2000000 (77.69%) with 250000 tries. Learned 1669414/2000000 (83.47%) with 300000 tries. Learned 1754926/2000000 (87.75%) with 350000 tries. Learned 1818577/2000000 (90.93%) with 400000 tries. Learned 1865694/2000000 (93.28%) with 450000 tries.
__________________
Python Ambassador of Serbia Poslednja izmena od Petar Marić : 19. 03. 2007. u 02:33. |
19. 03. 2007. | #9 |
Nikola Denić
Sir Write-a-Lot
|
ovo je generalno dobra ideja ...mada kao sto kaze Petar .. ne bih se ja oslanjao na M$ ...
Dobra stvar je da je ovo jako dobar koncept ... i da je realizacija neceg slicnog u svojoj realizaciji je relativno lako ( naravno lokalna baza slika ili glifa/ikona) .
__________________
Do not ask yourself what the world needs. Ask yourself what makes you come alive, and then go do that. Because what the world needs is people who have come alive |
|
|