(1) Directory
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prime number
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Greatest common divisor and least common multiple
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same surplus
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first degree congruence equation
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Euler's Theorem and Fermat's Little Theorem
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Several applications of elementary number theory in computer science and technology
(2) Main content
l evenly divisible
l prime number
typical example:
l Fundamental Theorem of Arithmetic
l Greatest common divisor and least common multiple
nature
Roll and divide
l same surplus
Congruence
l first degree congruence equation
Modular inverse 
Typical example:
l Euler's Theorem and Fermat's Little Theorem
l Several applications of elementary number theory in computer science and technology
Method to Generate Uniform Pseudorandom Numbers
Linear congruence and multiplication congruence
Cryptography:
Encryption Algorithm:
