Abstract: Today barcode system is very popular to protecting sensitive information. Many organizations are using this technique for protecting sensitive information. This paper presents an algorithm for hiding of data using 2D matrix code for high level of security. The proposed algorithm uses some modified definition of support and confidence so that it would hide any desired sensitive association rule without any side effect. Actually the enhanced technique is using the same method (as previously used method) of getting association rules but modified definitions of support and confidence are used Data Matrix is a matrix (2D or two-dimensional) bar code which may be printed as a square or rectangular symbol made up of individual dots or squares. This representation is an ordered grid of dark and light dots bordered by a finder pattern. The finder pattern is partly used to specify the orientation and structure of the symbol. The data is encoded using a series of dark or light dots based upon a pre-determined size. The minimum size of these dots is known as the X-dimension.