The law or act that protects against invasive acts by private individuals using electronic devices is

Electronic Communications Privacy Act (ECPA)

Explanation:

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The Electronic Communications Privacy Act of 1986 is an Act of Congress that extended the existing restrictions on government wire taps of telephone calls to transmissions of electronic data by computer. This act protected private individuals from invasive acts through their electronic devices. This was mainly designed to prevent unauthorized government access to private electronic communications.