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Detecting Source-Code Plagiarism

By Bob Zeidman, July 01, 2004

Bob examines the tools and algorithms for uncovering plagiarism in source code.
July, 2004: Detecting Source-Code Plagiarism

(a) 

if (x == 5)
{
    // Loop on j here
    for (j = 0; j < Index; j++)
        printf("x = %i", j);
}
else
    while (i < 5) i++;

(b) 

CONDITIONAL_BEGIN
LOOP_BEGIN
DISPLAY
LOOP_END
CONDITIONAL_END
CONDITIONAL_BEGIN
LOOP_BEGIN
ARITHMETIC
LOOP_END
CONDITIONAL_END

Figure 1: Token substitution. (a) Original program; (b) program structure profile.



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