Buana Property is one of the developers in the housing sector or is engaged in the business of selling, buying, and renting property. Advances in technology make Buana properties that always want to grow and be better known in the community with the construction of a mobile commerce system. So far, the system at Buana Properti is still a physical store that is offline so it is not well known to the public, there is no housing sales information system that uses a mobile web system. Therefore, this system is needed to simplify the process of selling housing at Buana Properti Medan which makes it easier for buyers to make house purchases at Buana Property. The system built will also provide a home search feature where this search feature is built using the String Matching method with the Knuth-Morris Pratt (KMP) model. The system that has been built itself uses HTML and PHP programming languages ​​in building mobile web and MySQL as a place database storage. The results of this study are that this system can assist buyers in finding homes that match their wishes and make purchase and payment transactions more easily.

Community Service is part of the Tridarma of Higher Education. Community Service is oriented to the practice of science and technology directly in the community. The goal is to implement the Tridarma of Higher Education as well as to contribute ideas and transfer technology to the East Lumban Pea Village apparatus. As the application of technology has touched almost all fields of work, including the government sector. This PKM activity was carried out for four days with computer training materials using Google Meet, Zoom, Attandace Tracker and Google Form. This topic is needed to equip village officials to hold meetings and other online activities.

A healthy Internet is one of the basic needs of the use of digital technology in various fields, especially in the world of education. Since SMAN I is one of the service partners and is also very close to the center of agriculture and tourism, Community is carried out by the Information System Study Program, Universitas Methodist Indonesia as a form of implementing the Tri Dharma of Higher Education. Its purpose and benefits are to share and contribute ideas and transfer knowledge and technology. This service activity was carried out for a day, with the material including explanations about Internet Sehat (Healthy Internet) and Internet Cakap. This topic is very much needed in the education community to be able to use the internet intelligently, creatively, and productively.

One way to protect the copyright and authenticity of a digital image is to affix a watermark in the form of writing or a sign on the image. If the affixed watermark is visible, then its presence can interfere with the appearance of the image and it is possible that the watermark will be cut, discarded, or cropped by parties who are not entitled to do so. In this paper, an application is designed to affix a watermark in the form of an invisible message, or an invisible watermark by using a combination of pixel value indicator and the Most Significant Bit (MSB) method on the image, so that it is not detected visually and the visual appearance of the image is not disturbed. The message is scrambled using a key, then the scrambled bits are hidden in the 5th bit MSB and the 6th bit of the green channel or blue channel, depending on the number of bits 1 owned by the red channel which serves as an indicator. The process of hiding the watermark is carried out in the middle area of ​​the image, so it is difficult to cut to remove it. Applications designed can be used to affix an invisible watermark in the form of messages that are not easily removed on digital images, so that they can protect the copyright of a digital image.