System and method for conducting secure transactions

1. A method for processing a transaction by a transaction server computer, the method comprising:

accepting at a transaction server computer transaction information from a user over a computer network, wherein said transaction information consists essentially of a transaction amount, a source of said transaction amount, and an intended destination of said transaction amount;

producing a customized statement, said customized statement including at least a portion of said transaction information and a challenge to said user based on said transaction information;

sending to a computing device associated with said user an obscured image representation of the customized statement for presentation to said user;

accepting from said computing device associated with said user a response to said challenge;

determining by said transaction server computer whether said response correctly responds to the challenge; and

in response to said response correctly responding to the challenge, processing by said transaction server computer a transaction based on said transaction information.

2. The method of claim 1 , wherein the obscured representation is generated according to a reverse Turing test mechanism.

3. The method of claim 1 , comprising selecting the customized statement from a set of customized statements.

4. The method of claim 1 , comprising selecting the customized statement according to a randomization algorithm.

5. The method of claim 1 , wherein sending said representation of the customized statement comprises sending said representation to the computing device associated with the user over the Internet.

6. The method of claim 1 , wherein determining whether said response correctly responds to the challenge includes determining whether said response includes at least said portion of said transaction information.

7. A system for processing a transaction, the system comprising:

a transaction server computer configured to:

accept transaction information from a user over a computer network, wherein said transaction information consists essentially of a transaction amount, a source of said transaction amount, and an intended destination of said transaction amount,

produce a customized statement, said customized statement including at least a portion of said transaction information and a challenge to said user based on said transaction information,

send to a computing device associated with said user a distorted image representation of the customized statement for presentation to said user;

accept from said computing device associated with said user a response to said challenge;

determine whether said response correctly responds to the challenge; and

process a transaction based on said transaction information if said response correctly responds to the challenge.

8. The system of claim 7 , wherein the distorted image is generated according to a reverse Turing test mechanism.

9. The system of claim 7 , wherein the transaction server computer is to randomly select the challenge from a set of possible challenges.

10. The system of claim 7 , further including a network for transmitting transaction information between the user and the transaction server.

11. The system of claim 10 , wherein the network is the Internet.

12. The system of claim 7 , wherein said transaction server computer is configured to determine whether said response is a correct response to the challenge by determining whether said response includes at least said portion of the transaction information.