``spiny cactos'' osn users attitudes and perceptions towards...

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1 “Spiny CACTOS” OSN Users Attitudes and Perceptions Towards Cryptographic Access Control Tools Ero Balsa, 1 Laura Brandimarte, 2 Alessandro Acquisti, 2 Claudia Diaz 1 and Seda G¨ urses 1,3 1 KU Leuven 2 Carnegie Mellon University 3 New York University 23 February, 2014 USEC’14, San Diego

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$Page 1: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

1

“Spiny CACTOS”OSN Users Attitudes and Perceptions Towards

Cryptographic Access Control Tools

Ero Balsa,1 Laura Brandimarte,2

Alessandro Acquisti,2 Claudia Diaz1 and Seda Gurses1,3

1 KU Leuven2 Carnegie Mellon University

3 New York University

23 February, 2014USEC’14, San Diego

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2

CACTOS

Cryptographic Access Control Tools for Online Social Networks

“SNP-problems:”

1. Delegation of privacy settings enforcement

2. Disclosure of all content to the service provider

Why is it that CACTOShave seen so little adoption in practice?

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2

CACTOS

Cryptographic Access Control Tools for Online Social Networks

“SNP-problems:”

1. Delegation of privacy settings enforcement

2. Disclosure of all content to the service provider

Why is it that CACTOShave seen so little adoption in practice?

$Page 4: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

2

CACTOS

Cryptographic Access Control Tools for Online Social Networks

“SNP-problems:”

1. Delegation of privacy settings enforcement

2. Disclosure of all content to the service provider

Why is it that CACTOShave seen so little adoption in practice?

$Page 5: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

3

The study

Three parts:

1. Entry questionnaire.

Q1 Concerned about SNP-problems?Q2 Responsible for mitigating SNP-problems?Q3 Use a tool to solve SNP-problems?

2. Guided tour to Scramble!

+ Introduction to CACTOS properties & SNP-problems

3. Exit questionnaire.

Q4 CACTOS like Scramble! appropriateto address SNP-problems?

$Page 6: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

3

The study

Three parts:

1. Entry questionnaire.

Q1 Concerned about SNP-problems?

Q2 Responsible for mitigating SNP-problems?Q3 Use a tool to solve SNP-problems?

2. Guided tour to Scramble!

+ Introduction to CACTOS properties & SNP-problems

3. Exit questionnaire.

Q4 CACTOS like Scramble! appropriateto address SNP-problems?

$Page 7: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

3

The study

Three parts:

1. Entry questionnaire.

Q1 Concerned about SNP-problems?Q2 Responsible for mitigating SNP-problems?

Q3 Use a tool to solve SNP-problems?

2. Guided tour to Scramble!

+ Introduction to CACTOS properties & SNP-problems

3. Exit questionnaire.

Q4 CACTOS like Scramble! appropriateto address SNP-problems?

$Page 8: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

3

The study

Three parts:

1. Entry questionnaire.

Q1 Concerned about SNP-problems?Q2 Responsible for mitigating SNP-problems?Q3 Use a tool to solve SNP-problems?

2. Guided tour to Scramble!

+ Introduction to CACTOS properties & SNP-problems

3. Exit questionnaire.

Q4 CACTOS like Scramble! appropriateto address SNP-problems?

$Page 9: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

3

The study

Three parts:

1. Entry questionnaire.

Q1 Concerned about SNP-problems?Q2 Responsible for mitigating SNP-problems?Q3 Use a tool to solve SNP-problems?

2. Guided tour to Scramble!

+ Introduction to CACTOS properties & SNP-problems

3. Exit questionnaire.

Q4 CACTOS like Scramble! appropriateto address SNP-problems?

$Page 10: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

3

The study

Three parts:

1. Entry questionnaire.

Q1 Concerned about SNP-problems?Q2 Responsible for mitigating SNP-problems?Q3 Use a tool to solve SNP-problems?

2. Guided tour to Scramble!

+ Introduction to CACTOS properties & SNP-problems

3. Exit questionnaire.

Q4 CACTOS like Scramble! appropriateto address SNP-problems?

$Page 11: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

4

Scramble!

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5

Scramble!

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6

Scramble!

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7

Scramble!

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8

Scramble!

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9

Study Setup

September 2013

52 CMU students (42% female, average age 21.5 yo)

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9

Study Setup

September 2013

52 CMU students (42% female, average age 21.5 yo)

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10

Results

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11

Results: Responsibility vs Control (Q1,Q2)

“Who should decide...?” vs “Who should be responsible for...”

Themselves : Facebook

81% : 24% vs 67% : 52%

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11

Results: Responsibility vs Control (Q1,Q2)

“Who should decide...?” vs “Who should be responsible for...”

Themselves : Facebook

81% : 24% vs 67% : 52%

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11

Results: Responsibility vs Control (Q1,Q2)

“Who should decide...?” vs “Who should be responsible for...”

Themselves : Facebook

81% : 24% vs 67% : 52%

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12

More on responsibilisation

“What do you feel responsible for?” (Open question)

what I post & manage privacy settings

“What choice do I have? To trust Facebook.” (Q1,Q2)

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12

More on responsibilisation

“What do you feel responsible for?” (Open question)

what I post & manage privacy settings

“What choice do I have? To trust Facebook.” (Q1,Q2)

$Page 24: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

12

More on responsibilisation

“What do you feel responsible for?” (Open question)

what I post & manage privacy settings

“What choice do I have? To trust Facebook.” (Q1,Q2)

$Page 25: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

13

Limitations of Facebook’s privacy settings (Q1)

“Which privacy problems, if any, do you encounter usingFacebook?” (Open question)

Lack of control over privacy settings

YES!Deleting info (indexing) YES!

Targetted ads YES!Lack of control over other people’s activities NO...

Facebook tracking NO...

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13

Limitations of Facebook’s privacy settings (Q1)

“Which privacy problems, if any, do you encounter usingFacebook?” (Open question)

Lack of control over privacy settings YES!Deleting info (indexing)

YES!Targetted ads YES!

Lack of control over other people’s activities NO...Facebook tracking NO...

$Page 27: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

13

Limitations of Facebook’s privacy settings (Q1)

“Which privacy problems, if any, do you encounter usingFacebook?” (Open question)

Lack of control over privacy settings YES!Deleting info (indexing) YES!

Targetted ads

YES!Lack of control over other people’s activities NO...

Facebook tracking NO...

$Page 28: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

13

Limitations of Facebook’s privacy settings (Q1)

“Which privacy problems, if any, do you encounter usingFacebook?” (Open question)

Lack of control over privacy settings YES!Deleting info (indexing) YES!

Targetted ads YES!Lack of control over other people’s activities

NO...Facebook tracking NO...

$Page 29: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

13

Limitations of Facebook’s privacy settings (Q1)

“Which privacy problems, if any, do you encounter usingFacebook?” (Open question)

Lack of control over privacy settings YES!Deleting info (indexing) YES!

Targetted ads YES!Lack of control over other people’s activities NO...

Facebook tracking

NO...

$Page 30: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

13

Limitations of Facebook’s privacy settings (Q1)

“Which privacy problems, if any, do you encounter usingFacebook?” (Open question)

Lack of control over privacy settings YES!Deleting info (indexing) YES!

Targetted ads YES!Lack of control over other people’s activities NO...

Facebook tracking NO...

$Page 31: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”

cumbersomeUseful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 32: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 33: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 34: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 35: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacy

scepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 36: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 37: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 38: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”

scepticism

$Page 39: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

14

Results: Attitudes and Perceptions Towards Scramble!

“Describe, in a few words your experience using Scramble!”cumbersome

Useful, but just for very private information

What would be the advantages, if any, of using a tool likeScramble!, over, or in combination with, other privacy controls?

more privacyscepticism

Do you think encryption is a secure way of protecting yourmessages?

“Yes!”scepticism

$Page 40: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

15

Results: Attitudes and Perceptions Towards Scramble! (2)

What is the difference between what Scramble! does and theprivacy settings of Facebook?

“I don’t know if Facebook uses encryption”“I’m not exactly sure of how Facebook’s privacy stuff operates”

What, if anything, did you like about scramble?The idea behind it!

$Page 41: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

15

Results: Attitudes and Perceptions Towards Scramble! (2)

What is the difference between what Scramble! does and theprivacy settings of Facebook?

“I don’t know if Facebook uses encryption”

“I’m not exactly sure of how Facebook’s privacy stuff operates”

What, if anything, did you like about scramble?The idea behind it!

$Page 42: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

15

Results: Attitudes and Perceptions Towards Scramble! (2)

What is the difference between what Scramble! does and theprivacy settings of Facebook?

“I don’t know if Facebook uses encryption”“I’m not exactly sure of how Facebook’s privacy stuff operates”

What, if anything, did you like about scramble?The idea behind it!

$Page 43: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

15

Results: Attitudes and Perceptions Towards Scramble! (2)

What is the difference between what Scramble! does and theprivacy settings of Facebook?

“I don’t know if Facebook uses encryption”“I’m not exactly sure of how Facebook’s privacy stuff operates”

What, if anything, did you like about scramble?

The idea behind it!

$Page 44: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

15

Results: Attitudes and Perceptions Towards Scramble! (2)

What is the difference between what Scramble! does and theprivacy settings of Facebook?

“I don’t know if Facebook uses encryption”“I’m not exactly sure of how Facebook’s privacy stuff operates”

What, if anything, did you like about scramble?The idea behind it!

$Page 45: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 46: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 47: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 48: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 49: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 50: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 51: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

16

Conclusions

privacy concerns related to SNP-problems.

too great a degree of protection, at too high a usability cost

what they share is not that sensitive

why trust CACTOS?

Some recommendations:

better explanations – more transparency!!

ease of use will not hurt – make it fast!

$Page 52: ``Spiny CACTOS'' OSN Users Attitudes and Perceptions Towards ...wp.internetsociety.org/ndss/wp-content/uploads/sites/25/2017/09/02... · 1 \Spiny CACTOS" OSN Users Attitudes and Perceptions$

17

Thank you!

Questions?

Final vimeet osn

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