Using the official app from CANDY HOUSE, you can share keys via QR code. This tool is designed to read the QR code and display the information contained in it.
All the processing is done on the client side, to make sure that the keys are not exposed.
# install dependencies
$ yarn install
# serve with hot reload at localhost:3000
$ yarn dev
# build for production and launch server
$ yarn build
$ yarn start
# generate static project
$ yarn generate
For detailed explanation on how things work, check out Nuxt.js docs.