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Computer security. Conceptual computer artwork of barbed wire around computers. This could represent computer security. Such security measures include the use of passwords and encryption of sensitive information, like credit card numbers or e-mails, before transmission over the internet. Passwords and encryption are also used to secure data on a computer, either to control access to the entire computers, or to certain sensitive documents. (KEYSTONE/SCIENCE PHOTO LIBRARY/VICTOR HABBICK VISIONS)