Question
18. Recall the spam reduction method discussed in Section 5.8.2. a. What property or properties of a secure hash function does this scheme rely on
18. Recall the spam reduction method discussed in Section 5.8.2.
a. What property or properties of a secure hash function does this
scheme rely on to reduce spam?
b. In Section 5.8.2, it is stated that "The message M includes the
sender's and intended recipient's email addresses, but does not
include any additional addresses." Suppose we relax this so that we
only require that the message M includes the intended recipient's
email address. Find an attack on this modified spam reduction
system, that is, show that a spammer could still send spam without
doing a large amount of work.
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