In 1984, the first U.S. federal computer crime law, the U.S. Computer Fraud and Abuse Act, was passed. This intermediate act was narrowly defined and somewhat ambiguous. The law covered

- Classified national defense or foreign relations information
- Records of financial institutions or credit reporting agencies
- Government computers
The U.S. Computer Fraud and Abuse Act of 1986 enhanced and strengthened the 1984 law, clarifying definitions of criminal fraud and abuse for federal computer crimes and removing obstacles to prosecution.

The Act established two new felony offenses for the unauthorized access of federal interest computers and a misdemeanor for unauthorized trafficking in computer passwords:

Felony 1: Unauthorized access, or access that exceeds authorization, of a federal interest computer to further an intended fraud, shall be punishable as a felony [Subsection (a)(4)].
Felony 2: Altering, damaging, or destroying information in a federal interest computer or preventing authorized use of the computer or information, that causes an aggregate loss of $1,000 or more during a one-year period or potentially impairs medical treatment, shall be punishable as a felony [Subsection (a)(5)].

This provision was stricken in its entirety and replaced with a more general provision, which we discuss later in this section.

- Misdemeanor: Trafficking in computer passwords or similar information if it affects interstate or foreign commerce or permits unauthorized access to computers used by or for the U.S. government [Subsection (a)(6)].

The Act defines a federal interest computer (actually, the term was changed to protected computer in the 1996 amendments to the Act) as either a computer

Several minor amendments to the U.S. Computer Fraud and Abuse Act were made in 1988, 1989, and 1990, and more significant amendments were made in 1994, 1996 (by the Economic Espionage Act of 1996), and 2001 (by the USA PATRIOT Act of 2001). The Act, in its present form, establishes seven specific computer crimes. In addition to the three that we discuss in the preceding list, these crimes include the following five provisions (we discuss subsection [a][5] in its current form in the following list):

- Unauthorized access, or access that exceeds authorization, to a computer that results in disclosure of U.S. national defense or foreign relations information [Subsection (a)(1)].
- Unauthorized access, or access that exceeds authorization, to a protected computer to obtain any information on that computer [Subsection (a)(2)].
- Unauthorized access to a protected computer, or access that exceeds authorization, to a protected computer that affects the use of that computer by or for the U.S. government [Subsection (a)(3)].
- Unauthorized access to a protected computer causing damage or reckless damage, or intentionally transmitting malicious code which causes damage to a protected computer [Subsection (a)(5), as amended].
- Transmission of interstate or foreign commerce communication threatening to cause damage to a protected computer for the purpose of extortion [Subsection (a)(7)].

In the section “USA PATRIOT Act of 2001,” later in this chapter, we discuss major amendments to the U.S. Computer Fraud and Abuse Act of 1986 (as amended) that Congress introduced in 2001.

The U.S. Computer Fraud and Abuse Act of 1986 is the major computer crime law currently in effect. The CISSP exam likely tests your knowledge of the Act in its original 1986 form, but you should also be prepared for revisions to the exam that may cover the more recent amendments to the Act.[img][/img]