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A variety of cryptographic techniques are being used to minimize threats to electronic financial transactions. The explosion of the Internet has permitted even small merchants to sell goods and services to a worldwide market, yet it has also exposed them to the depredations of a large pool of attackers whose motives range from greed to boredom. Fear of these risks has created a demand for security features built directly into electronic commerce systems. The good news is that existing security mechanisms can be combined to minimize a wide range of threats to electronic commerce. Security isn't the only problem. European banks will soon have electronic stored value cards that are as good as cash. Forgetting the password for a stored value card could be as troublesome as losing a wallet. The mechanisms used to solve security problems can be divided into four areas-privacy, authentication, integrity, and scalability-though a single mechanism can often mitigate more than one kind of problem. The cornerstone of all privacy mechanisms is encryption. An encryption algorithm transforms a plaintext message into an unreadable ciphertext using a key. The correct key can reverse the process, permitting anyone who knows it to get the plaintext message