Rob L's blog

Finally, I am trying coding tutorials

Here is the first two videos: Inspired by this: https://www.acefrontend.com/challenges

From bash to zsh, very basic things need to do

After upgrading MacOS to Catalina, everytime opening a terminal, there would be a prompt saying: The default interactive shell is now zsh. To update your account to use zsh, please run `chsh -s /bin/zsh` For more details, please visit https://support.apple.com/kb/HT208050 ...One day, I couldn't

it-stuff

LetsEncrypt Certbot renew successfully, but still got expired certificate from client(browser, curl or wget) side, what's the problem?

This article is just a trouble-shooting blog. It's rarely happen. After you even did a force renew by using sudo certbot renew --force-renewalAnd then check the certificate by using sudo certbot certificatesEverything looks just fine. But when you use curl or wget from a remote machine to test the website,

it-stuff

A cryptocurrency capital gain tax calculator written in Python by me

In 2019, I spent about a month to write this Python cryptocurrency capital gain tax calculator. Finally, I published this in github: https://github.com/viewplatgh/pycgt I wish this can be helpful to those who would have to deal with CGT because of any disposal of their cryptocurrencies.

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Verify rsa sha256 signed text in Python

I created a gist of basic implementation, in Python. Here it is: https://gist.github.com/viewplatgh/cb690159e8ee028cb4c9483cb127e6c3 Asymmetric encryption use a pair of public & private key to do the crypto job. Private key is the one being used to encrypt (sign) data. Public key is the one to