Table 4.

Areas at risk of security compromise in a text message study and measures adapted in TEXT ME and TEXTMEDS study.

Components	Measures adapted in TEXT ME and TEXTMEDS study
Text message engine hardware	Access to room by authorized personnel only
	Unit physically locked to bench
Text message engine software	Dedicated computer for sole purpose of running text message engine
	Passwords at screen login and engine software login
	Front facing passwords are hashed and salted
	Computer is configured to prevent reboot from CDa or USBb drive
Database	Database selected with security levels required for holding potentially identifying patient data.
Communication between portals	Secure HTTP (hypertext transfer protocol) or secure sockets layer (SSL) emails
	Onsite and offsite data backup (encrypted)
Text message	Avoiding identifying information in the body of the text message
	Participants instructed to consider password protection of their mobile phone and disable message preview function

^aCD: Compact disc.

^bUSB: Universal serial bus.