Which of the following is used to ensure that only humans obtain free email accounts?
a. Atomicity, consistency, isolation, and durability (ACID)
b. Microprocessor without Interlocked Pipeline Stages (MIPS)
c. Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA)
d. Document Style Semantics and Specification Language (DSSSL)
c. Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA)
Spammers can defeat the registration process of free email services by launching a coordinated bot attack that can sign up for thousands of email accounts. These accounts are then used by the spammers to send thousands of untraceable email messages for free. A partial solution to this problem is the use of CAPTCHA to ensure that only humans obtain free accounts. CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart) software generates and grades tests that humans can pass but all but the most sophisticated computer programs cannot.
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