There are many ways to contact me. None of these require proprietary software.
andrew AT andrewyu DOT org. (Please sign and encrypt messages. See below.)Yu, Andrew (Run Xi 于润熙, s22537), 1800, Lane 900 North Sanxin Road, Songjiang District, Shanghai, China 201620. (Note that I do not check school mail daily and I can't check it during vacations. Please do not attempt to use OpenPGP encryption or similar encryption for paper mail.)Please do not contact me via WeChat. I do not use popular social media like Twitter or Weibo. Please follow these communication guidelines when applicable. If you are a student of YK Pao School and would like to contact me for school-related purposes, use this.
If you have no idea what these mean, read the Email Self Defense tutorial.
Usually, electronic mail that I send are signed with my OpenPGP key. Please use OpenPGP when contacting me through electronic mail. The following are available.
In order to verify the authenticity of the key, check if you've actually downloaded these keys from andrewyu.org, and also check the fingerprints with me elsewhere (email, IRC, in real life, etc) before trusting or signing it.
Once confirmed, please sign and share my key in order to build the OpenPGP Web of Trust.