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The RSA algorithm developed by Ron Rivest is a key transport algorithm based on factoring a number of what?

Large semiprime composite numbers

Prime numbers

Symmetric keys

AES keys

The correct response is RSA is an asymmetric key algorithm based on factoring prime numbers. The algorithm is made difficult by factoring two large prime numbers which are typically 512 bits. EDIT: This question is misleading. You're NOT factoring prime numbers, you're factoring the PRODUCT of two prime numbers. Edit: This is wrong. The best answer, as the question is written, should be composite. Every integer is either: the number 1, a prime number (which means its only factors are itself and 1) or it is a composite number. There is a special term for composite numbers which are the product of just two prime numbers: "semiprimes". Semiprimes are highly useful in cryptography and specifically in RSA. https://en.wikipedia.org/wiki/Semiprime#Applications https://en.wikipedia.org/wiki/Composite_number

We are choosing 2 large prime numbers in RSA (p and q) where the product of those is a very large semiprime number. Hence, the answer should be Prime Numbers. Ref: Page 310 & 311 of CBK, 5th Edition.

EDIT: You cannot factor prime numbers. Please fix this question.

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