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Jonas Lindstrøm, Alexandra Institute

Privacy-preserving attribute-based credentials

Click to edit Master title styleMotivation

Shop

User

Issuer Trust

1: A

ge >

18

?

Click to edit Master title styleSolutions with online issuer

Issuer

• e.g. OpenID, Facebook Connect, SAML:

3: Authenticate2: Age > 18 ?

1: A

ge >

18

?

4: Age = 30

User

ShopJonas LindstrømAge = 30

Click to edit Master title styleSolutions with offline issuer

• e.g. X.509 v3 certificates:

Shop

Jonas Lindstrøm

Age = 30

0:

User

Jona

s Li

ndst

røm

Age =

30

2:

Issuer

1: A

ge >

18

?

Click to edit Master title stylePrivacy ABCs

• Privacy-preserving Attribute-based-credentials (Privacy ABCs):

Shop

User

Age >

18

2:

Issuer

1: A

ge >

18

?Jonas Lindstrøm

Age = 30

0:

Untraceability – Unlinkability – Minimal disclosure

Click to edit Master title styleExisting implementations

Click to edit Master title styleExisting implementations

• ABC4Trust pilot projects:– School forum in Söderhamn School– Course evaluation at Patras University

Alexandra Instituttet A/S - Om os

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• Untraceability, unlinkability and minimal disclosure.• Put users in charge of their own information.• Applicable in many use cases.• Software libraries are available.

Key points

Alexandra Instituttet A/S - Om os

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Thank you!