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Digital token
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Digital Tokens acts like an electronic key to access something.These are used in electronic payment system. These are also called digital coins. To obtain DigiCash, the customer uses the electronic wallet to create digital coins. The coins are sent to the bank to sign. When the coins are signed, the equivalent amount of money is withdrawn from the customer's account. In the proposed protocol the customer also had an option of "blinding" the coins. To blind a coin, the customer multiplies it by a random number r before sending it to the bank to sign. The bank signs the data. After the data and its digital signature are sent to the customer, the customer computes the digital signature of the original (non-multiplied) coin by dividing the bank's signature by r. This way the bank doesn't know the coin, but the customer, who knows r, can trace his/her payments. Blind signatures have not been implemented. |
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