Question $6($Mandatory$)(4$ points$)$

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All of the following help in speeding up RSA encryption and decryption except $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Question $6$ options:

A$)$

Chinese Remainder Theorem

B$)$

using distinct primes p; q

C$)$

choosing a short public exponent e

D$)$

square$-$and$-$multiply algorithm