What is the central idea of this paragraph? Read the excerpt from The Code Book.
Although traffic analysis, tempest attacks, viruses and
Trojan horses are all useful techniques for gathering
information, cryptanalysts realize that their real goal is to
find a way of cracking the RSA cipher, the cornerstone of
modern encryption. The RSA cipher is used to protect the
most important military, diplomatic, commercial and
criminal communications, exactly the messages that
intelligence gathering organizations want to decipher. If
they are to challenge strong RSA encryption,
cryptanalysts will need to make a major theoretical or
technological breakthrough.
O The Trojan horse technique is most effective in data
gathering
O The RSA cipher secures much of the world's
important information.
O Information gathering will fail without new technology
development.
O Breaking RSA code is the greatest challenge for
cryptanalysts.