Columbia subject headings:
Electronic systems--Security measures--United States.
Electronic trading of securities--United States.
Stock exchanges--Communication systems--Security measures--United States.
Telecommunication--Security measures--United States.
Harvard subject headings:
Data transmission systems--Security measures--United States.
Electronic systems--Security measures--United States.
Electronic trading of securities--Security measures--United States.
Electronic trading of securities--United States.
Stock exchanges--Communication systems--Security measures--United States.
Telecommunication--Security measures--United States.
Princeton subject headings:
Electronic systems--Security measures--United States.
Electronic trading of securities--United States.
Stock exchanges--Communication systems--Security measures--United States.
Telecommunication--Security measures--United States.