Long-term data integrity through controlled data conversion

Long-term data integrity through

controlled data conversion

Agenda

! Content Addressed Storage (CAS) ! CAS for long-term data integrity ! Example: www.staatsbladclip.be

Long-term data integrity

! content integrity ! time integrity ! viewing integrity

Content Addressed Storage (CAS)

action:store

object:clip

Content Addressed Storage (CAS)

action:retrieve

objects

Content Addressed Storage: clip

Clip

! Clip = hash => data integrity

! Clip is content address => flat addressing space

! CAS only uses content addressing => retrieve only via clip ! Possession of clip = access to data

! Clip = hash over 1 or more files

! Clip is independent of format of data ! Clip is independent of size of data ! Clip is portable

! Clip can contain metadata => metadata integrity ! Data integrity user authentication

From Clip to TrustClip

! Clip + Service Level Agreement = TrustClip ! Which service ?

! Archival (with/out replication)

! Timestamping

CAS for longterm data integrity

-Timestamping

! TSA model

! How? include TS into metadata

Internet

Internet

1 TrustClip

Timestamped Clip

Chained Timestamped Clip

CAS for long-term data integrity –

Controlled Conversion

! T1 (creation time of Clip): include in Clip metadata:

! viewing application (use a clip) ! possibly OS clip

! T2: check if new viewers available ! T2: if yes => conversion

Conversion Controlled Clip

Timestamp (t1) metadata

h1 _h1 hash value

Viewing Application X Clip (t1) hash value

H1(t1)

Timestamp (t2) metadata

h1 _h1 hash value

Viewing Application Y Clip hash value

H2(t2)

History CAS technology

! CAS = Content Addressed Storage

! Sold exclusively by EMC as Centera product line (2002) ! HyperTrust = first service provider worldwide to integrate

Centera for generalpurpose “Unified Internet Storage” -! see www.send2store.com

Your Content in Action

! HyperTrust = Internet Storage service provider ! any kind of data – any size, any format

! electronic documents (books, contracts, letters, e-mail attachments, CAD/CAM drawings)

! digital records (check images, photographs, or geophysical information - seismic or astronomical research)

Extending legacy application

! (Trust)Clips can travel within the application, but also

between applications, whether within 1 company or between several

! this is also valid for entire legacy application chains; in

this way, reference information is carried along the chain with minimal effort.

! no real limit to the amount of content that can be

Referencing beyond electrons

! as the Clip itself is “small” and strictly text, it is possible

to use other than electronic media (!) to affix electronic reference information to physical objects:

! printed labels

! barcodes (e.g., label with barcode of user manual on back side of appliance)

! OCR (e.g. electronic addenda to magazine articles) ! TrustClip references within printed contracts, e-mails,

Send2Store: CAS as an internet

service

! CAS = first utility-grade universal storage medium

=> well suited to ASP-like delivery

! Application areas

! store and forward ! sharing

! enriching ! referencing ! integrity

Internet

Internet

• E-mail or web upload with attachment(s)

(2) 1 TrustClip

Send2Store

Demos

! www.send2store.com (free 100Mbyte CAS storage) ! www.staatsbladclip.be