And such encryption relies on the primes that are used remaining secret. Using any of the 'well known' primes would be a bad idea as it is easy to go through t

And such encryption relies on the primes that are used remaining secret. Using any of the 'well known' primes would be a bad idea as it is easy to go through the 'well known' primes and test to see if they were used as a basis for the encryption.