clipperz: zero-knowledge web application

how JavaScript may help turning cloud privacy upside-down

1. zero-knowledge web application turning cloud privacy upside-down clipperz Giulio Cesare SOLAROLI giulio.cesare@clipperz.com jse2011 - Paris, January 20 2011 Thursday, January 20, 2011 how JavaScript may help
2. clipperz project Thursday, January 20, 2011
3. clipperz project store (and share) personal data Thursday, January 20, 2011
4. clipperz project store (and share) personal data •reliable Thursday, January 20, 2011
5. clipperz project store (and share) personal data •reliable •secure Thursday, January 20, 2011
6. clipperz project store (and share) personal data •reliable •secure •convenient Thursday, January 20, 2011
7. reliable Thursday, January 20, 2011
8. reliable the “cloud” is definitely the most reliable way to store data Thursday, January 20, 2011
9. secure Thursday, January 20, 2011
10. secure “host proof hosting” Thursday, January 20, 2011
11. secure “host proof hosting” concept defined around 2005 to merge the reliability of cloud based storage and the security achievable using cryptography Thursday, January 20, 2011
12. convenient Thursday, January 20, 2011
13. convenient since GMail, convenient means “web based” Thursday, January 20, 2011
14. convenient since GMail, convenient means “web based” •nothing to install Thursday, January 20, 2011
15. convenient since GMail, convenient means “web based” •nothing to install •nothing to configure Thursday, January 20, 2011
16. clipperz project Thursday, January 20, 2011
17. clipperz project Thatʼs easy Thursday, January 20, 2011
18. clipperz project Thatʼs easy, isnʼt it? Thursday, January 20, 2011
19. clipperz project Thatʼs easy almost! , isnʼt it? Thursday, January 20, 2011
20. clipperz project Thatʼs easy almost! the devil hides in the details , isnʼt it? Thursday, January 20, 2011
21. clipperz challenges Thursday, January 20, 2011
22. clipperz challenges achieve convenience Thursday, January 20, 2011
23. clipperz challenges achieve convenience keeping the system secure Thursday, January 20, 2011
24. clipperz challenges achieve convenience keeping the system secure •never trade security for convenience Thursday, January 20, 2011
25. clipperz challenges achieve convenience keeping the system secure •never trade security for convenience •being paranoid “only the paranoid survive” Thursday, January 20, 2011
26. cryptography very short compendium Thursday, January 20, 2011
27. cryptography Thursday, January 20, 2011
28. symmetric encryption scheme cryptography Thursday, January 20, 2011
29. symmetric encryption scheme •message cryptography Thursday, January 20, 2011
30. symmetric encryption scheme •message •algorithm cryptography Thursday, January 20, 2011
31. symmetric encryption scheme •message •algorithm •secret key cryptography Thursday, January 20, 2011
32. cryptography symmetric encryption Thursday, January 20, 2011
33. cryptography symmetric encryption Thursday, January 20, 2011
34. cryptography symmetric encryption Thursday, January 20, 2011
35. cryptography symmetric encryption Thursday, January 20, 2011
36. cryptography symmetric encryption Thursday, January 20, 2011
37. cryptography symmetric encryption Thursday, January 20, 2011
38. cryptography symmetric encryption Thursday, January 20, 2011
39. cryptography symmetric encryption Thursday, January 20, 2011
40. cryptography symmetric encryption Thursday, January 20, 2011
41. application anatomy Thursday, January 20, 2011
42. application anatomy zero-knowledge web app Thursday, January 20, 2011
43. application anatomy zero-knowledge web app aka host proof app Thursday, January 20, 2011
44. application anatomy zero-knowledge web app aka host proof app •verifiable codebase Thursday, January 20, 2011
45. application anatomy zero-knowledge web app aka host proof app •verifiable codebase •no tampering Thursday, January 20, 2011
46. application anatomy zero-knowledge web app aka host proof app •verifiable codebase •no tampering •wise password handling Thursday, January 20, 2011
47. verifiable codebase Thursday, January 20, 2011
48. verifiable codebase •all source code available for inspection https://github.com/clipperz Thursday, January 20, 2011
49. verifiable codebase •all source code available for inspection https://github.com/clipperz •app served as a single, static, HTML file Thursday, January 20, 2011
50. verifiable codebase •all source code available for inspection https://github.com/clipperz •app served as a single, static, HTML file •browsers do not support checksum verification #fail Thursday, January 20, 2011
51. no tampering Thursday, January 20, 2011
52. no tampering application code should not be modifiable by any data returned by the server Thursday, January 20, 2011
53. no tampering application code should not be modifiable by any data returned by the server •javascript is very dynamic Thursday, January 20, 2011
54. no tampering application code should not be modifiable by any data returned by the server •javascript is very dynamic •eval(…) is your enemy here Thursday, January 20, 2011
55. password handling Thursday, January 20, 2011
56. password handling password should never be sent to server Thursday, January 20, 2011
57. password handling password should never be sent to server •SRP authentication Thursday, January 20, 2011
58. password handling password should never be sent to server •SRP authentication •only verifiers are stored and exchanged Thursday, January 20, 2011
59. security tradeoffs Thursday, January 20, 2011
60. security tradeoffs features Thursday, January 20, 2011
61. security tradeoffs features security Thursday, January 20, 2011
62. security tradeoffs features security Thursday, January 20, 2011
63. security tradeoffs features security Thursday, January 20, 2011
64. being paranoid Thursday, January 20, 2011
65. being paranoid clipperz does not store neither the password, Thursday, January 20, 2011
66. being paranoid clipperz does not store neither the password, nor the username Thursday, January 20, 2011
67. being paranoid clipperz does not store neither the password, nor the username •users can still login! #ftw Thursday, January 20, 2011
68. being paranoid clipperz does not store neither the password, nor the username •users can still login! #ftw •multiple accounts can share the same username! #wtf Thursday, January 20, 2011
69. features?! Thursday, January 20, 2011
70. features?! password manager Thursday, January 20, 2011
71. features?! password manager playground to test how far this architecture could go Thursday, January 20, 2011
72. features?! password manager playground to test how far this architecture could go • features Thursday, January 20, 2011
73. features?! password manager playground to test how far this architecture could go • features • convenience Thursday, January 20, 2011
74. features?! password manager playground to test how far this architecture could go • features • convenience • reliability Thursday, January 20, 2011
75. features!! Thursday, January 20, 2011
76. features!! direct logins Thursday, January 20, 2011
77. features!! direct logins one-click access to most sites #ftw Thursday, January 20, 2011
78. features!! direct logins one-click access to most sites ✘ some #cool ✓ Thursday, January 20, 2011
79. features!! Thursday, January 20, 2011
80. features!! one time password Thursday, January 20, 2011
81. features!! one time password access your data without typing your password Thursday, January 20, 2011
82. features!! one time password access your data without typing your password great for using clipperz from an internet caffè Thursday, January 20, 2011
83. features!! Thursday, January 20, 2011
84. features!! offline copy Thursday, January 20, 2011
85. features!! offline copy full application (including your own data) packed into a single html file Thursday, January 20, 2011
86. features!! offline copy full application (including your own data) packed into a single html file no external resources used Thursday, January 20, 2011
87. features!! Thursday, January 20, 2011
88. hidden features!! Thursday, January 20, 2011
89. hidden features!! hashcash Thursday, January 20, 2011
90. hidden features!! hashcash avoid bots access without bothering users with nasty capcha puzzles Thursday, January 20, 2011
91. odd side effects!! Thursday, January 20, 2011
92. odd side effects!! no page reload Thursday, January 20, 2011
93. odd side effects!! no page reload otherwise credential values are lost, and the user needs to type them in again #fail Thursday, January 20, 2011
94. odd side effects!! Thursday, January 20, 2011
95. odd side effects!! no fancy web-2.0 mash-ups Thursday, January 20, 2011
96. odd side effects!! no fancy web-2.0 mash-ups difficult to integrate into other products without relaxing security concerns Thursday, January 20, 2011
97. odd side effects!! no fancy web-2.0 mash-ups difficult to integrate into other products without relaxing security concerns and we are paranoid! Thursday, January 20, 2011
98. clipperz http://www.clipperz.com giulio.cesare@clipperz.com THANKS Thursday, January 20, 2011