Before you download the Intel® SDK for OpenCL* Applications XE 2013, please read the Install Guide.
Use the following public key: Intel-E901-172E-EF96-900F-B8E1-4184-D7BE-0E73-F789-186F.pub
For Intel Xeon Phi coprocessor support, you must install Intel® Manycore Platform Software Stack (Intel® MPSS) Update 3 or higher, available at http://software.intel.com/en-us/articles/intel-manycore-platform-software-stack-mpss.