Contact Andrew Yu

There are many ways to contact me. None of these require proprietary software.

Please do not contact me via WeChat. (Same for other proprietary stuff like Discord.)
I do not use modern ``social media'' like Twitter or Weibo, here's why.
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, 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.