Blocking fraudulent transactions in an NFC device

A computer system for blocking fraudulent transactions, the computer system comprising:

• one or more computer processors of a mobile device assigned to a user;
• one or more computer-readable storage media;
• and
• program instructions stored on the one or more computer-readable storage media which when executed by the one or more computer processors, cause the one or more computer processors to:
• receive sensor data from sensors of the mobile device in response to receiving one or more requests to perform a transaction via the mobile device, the sensor data comprising brightness data of the environment surrounding the mobile device, acoustic data of the environment surrounding the mobile device, angle data for the mobile device, height data for the mobile device, and acceleration data for the mobile device;
• determine a transaction environment for the mobile device by comparing the brightness data to a predetermined brightness threshold, comparing the acoustic data to a predetermined reference pattern, comparing the angle data to a predetermined angle threshold, comparing the height data to a predetermined height threshold, and comparing the acceleration data to a predetermined acceleration threshold;
• classifying the transaction environment is an atypical transaction environment based on the brightness data being below the predetermined brightness threshold, the acoustic data matching the predetermined reference pattern, the angle data exceeding the predetermined angle threshold, the height data being exceeding the predetermined height threshold, and the acceleration exceeding the predetermined acceleration threshold;
• block the transaction in response to determining the transaction environment is the atypical transaction environment;
• and
• request the user to confirm the transaction, wherein the transaction remains blocked until a confirmation is received from the user.

A computer program product for blocking fraudulent transactions, the computer program product comprising:

• one or more computer-readable storage media of a mobile device assigned to a user;
• and
• program instructions stored on the one or more computer-readable storage media which when executed by a processor, cause the processor to:
• receive sensor data from sensors of the mobile device in response to receiving one or more requests to perform a transaction via the mobile device, the sensor data comprising brightness data of the environment surrounding the mobile device, acoustic data of the environment surrounding the mobile device, angle data for the mobile device, height data for the mobile device, and acceleration data for the mobile device;
• determine a transaction environment for the mobile device by comparing the brightness data to a predetermined brightness threshold, comparing the acoustic data to a predetermined reference pattern, comparing the angle data to a predetermined angle threshold, comparing the height data to a predetermined height threshold, and comparing the acceleration data to a predetermined acceleration threshold;
• classifying the transaction environment is an atypical transaction environment based on the brightness data being below the predetermined brightness threshold, the acoustic data matching the predetermined reference pattern, the angle data exceeding the predetermined angle threshold, the height data being exceeding the predetermined height threshold, and the acceleration exceeding the predetermined acceleration threshold;
• block the transaction in response to determining the transaction environment is the atypical transaction environment;
• and
• request the user to confirm the transaction, wherein the transaction remains blocked until a confirmation is received from the user.