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1. Linkability Problem 2. Cost of the Linkability Problem
3. Existing Solutions and Positioning of Ours 4. RahasNym in Online Shopping
5. Architecture and Performance 6. Features, Benefits and Future Work
Digital identity is linked across many
identity providers and identity consumers.
SSN Authority
Issues:
Records: Passport No.
Mobile Network
Issues:
Records:
Email Provider
Issues:
Records:
Attack On Mat Honan’s
Connected Identity
Sometimes, it may cost your entire digital life!
deleted
Existing
transaction
systems
 Allows to create accounts
with pseudonyms
 Same identity information
enables linkability.
Solutions by
Previous
Research
 Lacks certain other desirable
features: e.g: accountability,
authenticity, non-shareability.
 More than three parties are
involved, bulky tokens,
complex protocols.
 Provides unconditional
unlinkability.
D. Chaum ‘85,
J. Camenish ‘01
RahasNym
 Simple, flexible and easily adoptable.
 Trades-off unconditional assurance to
achieve the right balance of desirable
features.
RahasNym: Preventing Linkability in the
Digital Identity Eco System
Request policy
CCN-IDT + non-interactive
ZKP with signature
User Device
Protocol 1 Protocol 2 Protocol 3 Protocol 4
Execution Time (ms) 2.945 84.257 82.148 148.48
Communication Size
(KB)
3.5 3.5 3.5 3.6
Service
Provider
IDP
internet
1
User
policy
SP
policy
Email-IDT, Addr-IDT
+ non-interactive ZKP
Transaction receipt
Email-
IDT
CCN
IDT
Address IDT
Main Components in RahasNym:
 Protocol Suite:
 IDT request protocol
 Three identity proof
protocols
 Policy Framework:
 Policy language, schema
 Policy combining
algorithm
Web App.
Client API
Native App.
Client API
IDM
Module
internet
internet
SP API
IDP API
5
2 4
2 4
1 5
3
- Four APIs exposed by
RahasNym.
RahasNym
Features
Future Work
Benefits for User
Benefits for IDP
Benefits for SP
• Unlinkability
• Accountability
• Confidentiality
• Authenticity
• Ownership Assurance
• Non-shareability
• Flexibility
• Ability to carry out
secure and unlinkable
transactions.
• Not having to maintain
identity repositories of users
which are targets of attackers.
• Provides accountability and
authenticity assurance on
transactions.
• Strong ownership
assurance on IDTs and
authenticity assurance
on transactions will
lower the costs caused
by frauds.
• Improving RahasNym to
facilitate re-use of IDTs while
at the same time preserving all
the desirable features.
Authors: Hasini Gunasinghe, Elisa Bertino
Shipping Service
Records:
Online Merchant
Records:
Bank
Issues:
Records: ,
Insurance Provider
Issues:
Records:
Healthcare Provider
Records: ,
1
2
4 4
3

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RahasNym: Preventing Linkability in the Digital Identity Eco System

  • 1. 1. Linkability Problem 2. Cost of the Linkability Problem 3. Existing Solutions and Positioning of Ours 4. RahasNym in Online Shopping 5. Architecture and Performance 6. Features, Benefits and Future Work Digital identity is linked across many identity providers and identity consumers. SSN Authority Issues: Records: Passport No. Mobile Network Issues: Records: Email Provider Issues: Records: Attack On Mat Honan’s Connected Identity Sometimes, it may cost your entire digital life! deleted Existing transaction systems  Allows to create accounts with pseudonyms  Same identity information enables linkability. Solutions by Previous Research  Lacks certain other desirable features: e.g: accountability, authenticity, non-shareability.  More than three parties are involved, bulky tokens, complex protocols.  Provides unconditional unlinkability. D. Chaum ‘85, J. Camenish ‘01 RahasNym  Simple, flexible and easily adoptable.  Trades-off unconditional assurance to achieve the right balance of desirable features. RahasNym: Preventing Linkability in the Digital Identity Eco System Request policy CCN-IDT + non-interactive ZKP with signature User Device Protocol 1 Protocol 2 Protocol 3 Protocol 4 Execution Time (ms) 2.945 84.257 82.148 148.48 Communication Size (KB) 3.5 3.5 3.5 3.6 Service Provider IDP internet 1 User policy SP policy Email-IDT, Addr-IDT + non-interactive ZKP Transaction receipt Email- IDT CCN IDT Address IDT Main Components in RahasNym:  Protocol Suite:  IDT request protocol  Three identity proof protocols  Policy Framework:  Policy language, schema  Policy combining algorithm Web App. Client API Native App. Client API IDM Module internet internet SP API IDP API 5 2 4 2 4 1 5 3 - Four APIs exposed by RahasNym. RahasNym Features Future Work Benefits for User Benefits for IDP Benefits for SP • Unlinkability • Accountability • Confidentiality • Authenticity • Ownership Assurance • Non-shareability • Flexibility • Ability to carry out secure and unlinkable transactions. • Not having to maintain identity repositories of users which are targets of attackers. • Provides accountability and authenticity assurance on transactions. • Strong ownership assurance on IDTs and authenticity assurance on transactions will lower the costs caused by frauds. • Improving RahasNym to facilitate re-use of IDTs while at the same time preserving all the desirable features. Authors: Hasini Gunasinghe, Elisa Bertino Shipping Service Records: Online Merchant Records: Bank Issues: Records: , Insurance Provider Issues: Records: Healthcare Provider Records: , 1 2 4 4 3