Sungkyunkwan University

Samsung Electronics Co., Ltd.

Hyoungshick Kim

Taeyoung Kim

Junho Huh

Woojin Park

Ilyoup Kwak

Chanjong Lee

Hyungjoon Koo

Yunhee Jang

A watermarking method for smart contract according to an embodiment of the present disclosure comprises compiling a source code of a smart contract to create a contract creation bytecode and a runtime bytecode; generating a control flow graph including a plurality of byte regions based on the runtime bytecode; setting opcode groups by grouping consecutive opcodes in an opcode list in the plurality of byte regions of the generated control flow graph so that a sum of gas costs for the consecutive opcodes is greater than or equal to a preset gas cost value; extracting a watermarkable byte region based on the set opcode groups; determining watermarking bytes, in which a watermark is to be embed in the watermarkable byte region, to embed the watermark and storing location information of the determined watermarking bytes; hashing fingerprint information including information on the watermark and the location information of the watermarking bytes to create a fingerprint; and embedding the created fingerprint in the contract creation bytecode to deploy the smart contract. Hence, the watermark can be embedded without an additional executable code and a gas fee in a smart contract program.

Watermarking method for smart contract

Disclosed are a location-based operation method, an electronic device, and a recording medium. The electronic device may include a memory storing instructions; and a processor configured to execute the instructions to: identify a first location of the electronic device based on first communication information; obtain, based on the identified first location being identified as being included in a second location area that is adjacent to and includes a first location area, second communication information; identify a second location of the electronic device based on at least a part of the obtained second communication information; and change a locked state of the electronic device to an unlocked state, based on the second location of the electronic device being identified as being included in the first location area.

Method, electronic device and storage medium for unlocking electronic device based on location

Growing community of inventors

Suwon-si, South Korea

Hyoungshick Kim