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OCR for page 26
26
will be sought for the call center recruitment separately from and stored on an array of HDs configured in a RAID (Redun-
that for the main study activities. dant Array of Independent Disks). The RAID configurations
on the S07 and S06 servers allow system administrators to
completely restore a full copy of the data in the event of an
Collection Process from
HD failure on the server. Furthermore, once the data have
Vehicle to Server
been successfully transferred to the S06 site, an additional
The data collected during the NDS will include participant- copy of the data will be stored for archival purposes.
identifying data and other sensitive personal information that Data will be encrypted onboard the DAS by way of Advanced
must be protected. Consequently, every effort will be taken to Encryption Standard (128- or 256-bit AES) symmetric encryp-
protect all data from unauthorized access. The video data will tion. The key used for the encryption will be randomly gen-
be encrypted on the DAS and will remain encrypted until the erated for each trip, and that key is encrypted using the Rivest,
data transfer process to the S06 server has been successfully Shamir, Adleman (RSA) public key of a public/private key
completed. Once data quality processes have been applied, pair. The encrypted key file is stored with the same naming
the video data will be reencrypted for storage. The data col- convention alongside the encrypted data and video files. This
lection process is illustrated at a high level in Figure 5.1. scenario provides the security of having a private key that will
The hard drive on the DAS has a single copy of the data. As not be onboard the system, while allowing the data and video
those data are transferred to the S07 server, they are replicated to be encrypted with the much faster symmetric encryption.
DAS
DAS (Re)Manufactured
Shipped to - Bad DAS
S07 Instantiated into
Inventory Mgt
S07
S07 Schedules
Schedules Fixable
Yes No HD or DAS
& Fixes by S07?
Removal
DAS
No
Crash
(or Crash Site)
Criterion
Investigation Yes
Crash? Yes
Considered w/
S07 S06 Manager
Good DAS
Installs
Yes & All Data
Good
DAS
HD Nearing
DAS Periodic DAS
Capacity or
Collects Wireless Problem? No
Sched Removal?
Data Health Check
No
S07 Gets
S07 Workflow Process S07 Uploads
Confirmation of
Refurbishes Yes Confirms Successful Data to Staging
Successful
DAS Data Upload Server
Data Upload
Predominately Site
Contractors Functions No
Predominantly
Oversight & Integration
Contractor Functions
Workflow
S06
Process
Wireless Processes
Uploads Data
Software Data for
to S06 Host
Update Access
Server
Figure 5.1. Data collection process.
