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Captcha
1.
CAPTCHA
2.
1. Ce este
un CAPTCHA 2. Cum se implementeaza 3. Tipuri de atacuri 4. Noi tehnologii Vom discuta despre
3.
4.
Scopul este de
a ne asigura că avem de-a face cu un utilizator și nu cu un computer
5.
De obicei este
vorba de o imagine ce conține un cod
6.
7.
Când utilizatorii se
înregistrează pe site
8.
Pentru sondaje sau
statistici
9.
10.
11.
E suficient de
simplu incat sa nu fie incomod pentru utilizatori
12.
13.
Nu e indicat
sa folosim GET
14.
15.
Cuvintele pot fi
mai usor de spart cu ajutorul unui dictionar
16.
Se pot genera
cuvinte pseudo-random (Lanturi Markov)
17.
Trebuie sa fie
totusi ceva usor de scris
18.
19.
Codul trebuie distorsionat
sau mascat
20.
Abordarile simpliste nu
au efect
21.
22.
Implementare practica!
23.
Sursa pozei poate
fi orice
24.
25.
26.
Serviciile de CAPTCHA
sunt tinta unor atacuri specifice
27.
28.
Se folosesc metode
de eliminare a zgomotului (desaturare, threshold, etc.)
29.
Se incearca recunoasterea
litera cu litera, care esueaza daca se combina simbolurile
30.
Fonturile ciudate si
distorsiunile sunt greu de identificat
31.
32.
Functioneaza prin “otravirea”
bazelor de date
33.
Cuvintele pseudo-random necesita
verificari speciale, de care profita atacatorii (la reCAPTCHA, unul din cuvinte este pentru verificare)
34.
35.
Se preia un
CAPTCHA de pe situl tinta si se afiseaza pe un site de-al atacatorului
36.
Grupul Anonymous a
creat o interfata de unde se pot sparge CAPTCHA in mod voluntar Informatii pe blog
37.
4. Noi tehnologii
Sursa: http://xkcd.com/233/
38.
39.
Pot fi incorporate
reclame in clipuri
40.
Se incarca greu
si consuma banda
41.
Utilizatorii nu au
rabdare sa urmareasca tot Avantaj sau dezavantaj?
42.
43.
Lenta si cu
multe buguri
44.
45.
Greu de inteles,
chiar si pentru oameni
46.
Intrebari?
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