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Digital watermarking is a technique of embedding pieces of information intodigital data such as text, audio, video, and still images that can be detectedor extracted later to show authentication about the data. Watermark is hiddeninformation in the image(s) and is so designed that it does not degrade/distortthe quality of the image and still keeps the information. Digital watermarkingis basically to protect ownership rights and to control of making illicitcopies of digital data. In this paper, we have discussed various watermarkingtechniques and properties and have proposed a modified LSB technique. We haveimplemented the proposed technique by following: 2-bits of 8-bit gray image isreplaced by luminance part, next 2-bits by red component, next 2-bits by greencomponent and next 2-bits by blue component of 32-bit image using secret key.The advantage is that watermarking capacity has been increased and unaffectedby various attacks e.g. zero out LSB bits, cropping etc. Watermark image isimperceptible in resultant image. We have tested this technique on severalimages and found that it is quite satisfactory. This technique is secured asunauthorized user can not extract the watermarked contents easily from theoriginal image and works well in adverse situations. We have implemented thistechnique on platform java 1.5.0.

A Modified LSB Technique of Digital Watermarking in Spatial Domain