user agent

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user agent

A client program that is used to access servers on a network, typically the Internet. It may refer to an email client (see messaging system), a Web browser, search engine spider or any other program in the user's machine that is accessing a service on the Internet (see user agent string).
References in periodicals archive ?
We utilize a product token to eliminate the overhead of decryption key management on the arbiter.
Our protocol is composed of three phases: product token generation and distribution phase, product purchase and transaction phase, and dispute resolution phase.
i]} for digital product i to Z to apply a corresponding product token [Tk.
Digital product validation sub-phase: Once customer C downloads an encrypted digital product and the corresponding product token successfully, C will verify the integrity of product token and the correctness of downloaded product.
If the product token is valid and the integrity of downloaded product is preserved, C will initiate the payment transaction sub-phase.
Then, Z decrypts product decryption key derived from product token and sends it to C.
M' may send an incorrect product token or an incorrect product to C.
Instead of relying on extra SET or e-cash system to achieve fair exchange and customer anonymity, our protocol adopts self-certified public key mechanism and invents product token to achieve the same features, i.
i] Product token of digital product i, such that [Tk.
In our e-payment protocol, four distinct roles are involved and we define symbols C as online customer, M as the merchant who sells digital products, Z as the arbiter which generates and distributes product tokens to merchants and is responsible to resolve a transaction dispute, and B as the bank which provides e-payment transaction service between customers and merchants.
Finally, M publishes encrypted digital products and corresponding product tokens on his online shop.