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AUTHENTICATION METHODS 
PRELIMINARY REPORT 
BRADLEE CHANG 
XCENTIAL GROUP 
BRAD@XCENTIAL.COM 
UELMA 
Exploring Authentication Options 
Nov 4, 2011 
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Xcential Group, LLC 
UELMA - Exploring Authorization Options 
Overview 
Many ways to authenticate primary legal documents 
Solutions have varying capabilities 
Costs range from nearly free to nearly $200,000. 
We explored: 
Basic Methods 
Commercial Product Offerings 
Six Typical Configurations 
Advantages  & Disadvantages 
Costs 
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Xcential Group, LLC 
UELMA - Exploring Authorization Options 
Agenda 
I. Requirements 
II. Authentication Methods 
II. Components of Authentication Solutions 
III. Sample Scenarios, Costs and Benefits 
IV. Discussion 
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Xcential Group, LLC 
UELMA - Exploring Authorization Options 
Requirements 
Authenticity of Origin - verification that the 
document 
is actually from the source that it claims to 
come from (e.g. the State of California Office of 
Legislative Counsel)
Document Integrity - verification that the 
document has not been altered since it left its source. 
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What We Are Authenticating 
Chaptered Bills (Statutes) 
Chaptered Resolutions 
Constitutional Amendments 
State Constitution 
State Codes 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
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For Whom 
General Public  
Future Public 
Libraries 
Other Governmental Bodies 
Private Sector Organizations 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
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Agenda 
I. Requirements 
II. Authentication Methods 
II. Components of Authentication Solutions 
III. Sample Scenarios, Costs and Benefits 
IV. Discussion 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
Authentication Building Blocks 
UELMA - Exploring Authorization Options 
CA 
fb4e … a67d 
CA 
CA 
Xcential Group, LLC 
Hash Codes 
UELMA - Exploring Authorization Options 
fb4e … a67d 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
10 
Hash Codes (a.k.a. Digests) 
“Fingerprint” of a document 
If doc changes → hash changes 
Impossible to recreate doc from hash 
Infeasible to forge a doc matching a hash 
Hashing Algorithms 
SHA-1 Widely used,  but no longer recommended
SHA-2 Currently recommended
1
SHA-3 Future development 
MD5 
Widely used, but proven to be weak 
(1)
http://csrc.nist.gov/groups/ST/hash/policy.html 
Xcential Group, LLC 
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