Securing Virtual Private Networks (VPN), Page 2 Asymmetric
Encryption, or public key encryption, depends on a pair of keys
called public key and private key; hence the name. The keys are
selected such that, if data is encrypted through key 1, it can
be only decrypted through key 2 and vice versa. Of the two keys,
we tell about one to everybody and call it a public key. The
other is kept private for decrypting and called a private key.
For example, our e-mail account has a public e-mail address that
we give to everyone we want to but we won't tell the password to
anyone. Suppose a person named Linda is a broker and she gets a
request mail by James Anderson for buying some stock shares for
his company. She performs all the arrangements and sends a
confirmation mail to James. In the end, she sends a bill to him
for the payment; at this point, James completely denies that he
has ever sent a mail to Linda for any stock shares. Now what
should Linda do? She is in extreme trouble because there is no
clue to prove th