## What is a metaverse?

### Why is everyone talking about it?

Posted on September 20, 2021

上週，數百萬阿麗亞娜·格蘭德（Ariana Grande）的粉絲參加了她的音樂會，這些音樂會不是在傳統場地舉行，而是在遊戲《堡壘之夜》（Fortnite）中舉行。這些活動配有音樂和3D畫面，是硅谷最受歡迎的新流行語的一個例子：元宇宙。

## How to compute \(R^2\mod N\)?

### Using Montgomery modular multiplication

Posted on May 30, 2020

In order to use Montgomery modular multiplication, we need to know (R^2\mod N). If we already have Montgomery multiplication in hand, can we avoid brute-force calculation?

## Ed25519 & X25519

### Algorithms with 25519

Posted on October 17, 2019

Ed25519 is often used in SSH, then what does this number mean? Is there any other algorithms related to 25519?

## Debug MIPI DSI of RK3399

Posted on January 14, 2019

RK3399 is the most recent hign-end SoC of Rockchip.
Its previous generation RK3288 is widely used in various places. For example, ASUS C100PA Chromebook Flip uses the RK3288. As an upgraded model, RK3399 has a six-core CPU consisting of two A72 cores and four A53 cores, and the GPU has been upgraded to the Mali-T860.

## The New Domain is Online

Posted on January 13, 2019

The new .fan TLD is launched on December 12, 2018. Then I got this domain: dang.fan.