Question: Barney wants to use a public key encryption algorithm such as RSA or ElGamal to send 1 0 - digit telephone numbers securely , by

Barney wants to use a public key encryption algorithm such as RSA or ElGamal to send 10-digit telephone numbers securely, by encrypting the number with his public key.
What type of attack is this idea vulnerable to?
Frequency analysis of most common phone numbers.
A timing attack?
An exhaustive search of all possible private keys.
A short message attack.

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