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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.