Payword and MicroMint are two simple micropayment schemes proposed by
Ronald L, Rivest and Adi Shamir. In both schemes,the players are
brokers,users,and vendors. Brokers authorize users to make
micropayment to vendors and redeem the payments collected by the
vendors, Please compare and comment on the following design issues,
these two schemes:
1. How the mint coins are produced and redeemed for these two schemes?
2. Which scheme uses public-key operation for what purposes? If the
one did not use public-key operation,what equivalent operations are
proposed to achieve the similar objective?
3. Please compare the security mechanisms between these two schemes in
terms of massive forgery and persistent double-spending? If you are
the challenger, which scheme you will attack based on their
computational complexity? |
