I was curious to study the behaviour of the Proof-of-Work protocol in block-chains. The essence of POW is the use of a nonce as part of the payload being signed. In order to do this, I decided to test it out with a simple signing test program. The signature algorithm chosen uses a 512-bit RSA key with a SHA-224 hash. A stronger hash algorithm would just take longer but it wouldn’t really deviate too much from the characteristics. The example...
Read moreWireshark is a free and open source packet analyser. It is used for network troubleshooting, analysis, software and communications protocol development, and education. This is not a well advertised feature but it is possible to use Wireshark to monitor the traffic on a third machine. This may come in handy when one is interested to study a remote system under monitoring. So, it is possible for machine C to analyse the traffic between machines A and B, without having to...
Read moreWe’re trying to increase IPv6 adoption by migrating things. However, slow IPv6 routes don’t help. We tested things using Vultr’s network as they had servers is 15 countries. These are an abbreviated sample of the results. LONDON HOST: vm1359261.vultr.com Loss% Snt Last Avg Best Wrst StDev 1. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 6. 2001:e68:5083:6d93:7555:c0a5:2945:cbd9 10.0% 10 269.5 269.6 269.2 269.9 0.2 PARIS HOST: vm1359265.vultr.com Loss% Snt Last Avg Best Wrst StDev 1. ??? 100.0 10 0.0 0.0...
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While there are a lot of examples that describe how to set up a LVM cache on an SSD for a HDD backed storage, they mostly fail to describe an additional step needed to preserve the cache across a reboot on a Ubuntu system. The culprit is that the drivers needed to enable the LVM cache are not built into the kernel, nor available in the initrd. Therefore, these drivers need to be added to the initrd. Additionally, some cache Read more
This week, I moved from reading the Go code to changing it. My goal was the first small step of the C++ to Go migration: get the existing Go version of the registration system to build cleanly, and make sure it can’t damage real data when it runs. Getting It to Build The Go version didn’t build from a fresh copy. It was missing go.sum, a file that stores a fingerprint of each outside library the code uses, so Go Read more
Second-to-Last Review This will be my final week as an intern for this company. So, on 13th October, I showcased the improved mobile layout, as well as the replaced images. Dr. Shawn was content with my work, but expressed that the tablet layout still looks improper. He also said that he prefers more real photographs than stock images. So, I noted those down as my tasks for the week before my internship ends. Final Touches I tried to fix the Read more
Weekly Review On the 5th of October, I had my weekly review with Dr. Shawn, where I showed him my current progress with the Sayembara website. He was satisfied with the new descriptions I provided for each feature—safe for a few adjustments that I could make if I have the time to do so. However, he assured me that the most important that I need to do to complete the project before my internship ends is to finalize the mobile Read more
This week, I started my new main task: migrating the backend of the registration system from C++ to Go (Golang). I’m not familiar with either language, so most of my week went into understanding the existing code and learning the basics of Go. Understanding the Existing System Monday was a light day, as I spent most of it travelling back after the weekend event in Johor Bahru. In the time I had left, I went through the C++ code again. Read more
Weekly Review On 28th September, I showcased the five new webpages to Dr. Shawn to assess them. There were a lot of revisions that needed to be done regarding the descriptions, and how close they were to the edge of the screen, so I noted those down. I also had to add a disclaimer at the bottom of the website that the illustrations used were from Freepik. Time for Editing! I started by editing the descriptions’ margins so that they Read more
This week, I built the warning system for shared judge logins and then reworked it into a blocking system based on Dr Shawn’s feedback. After that, I started on my backend project and helped Team Euroasia prepare for and run their event. Building the Warning System I started by implementing the warning system in the admin app. It listens for changes to judges’ marks in real time and flags any mark that the judge app has saved more than once, Read more
This week, I presented my idea for detecting shared judge logins to Dr Shawn, revised it based on the feedback, and submitted a final proposal. At the end of the week, I also helped at an event at Da Men Mall, which was the first event to use the code I have developed for the admin app. Rethinking My First Approach My first idea was to create a backend API endpoint that gets device or session IDs from another project, Read more
Over the past two weeks, I completed the migration of the project’s automated tests from Jest to Vitest and got the changes merged. After that, I started a new task: researching how to detect when two accounts log in under the same role. Week 7 began with a setback, as I was admitted to the hospital on Monday with severe stomach pain and spent the day receiving treatment and resting. Learning Vitest and Migrating the Tests When I returned on Read more
Weekly Review On 22nd September, I showed Dr. Shawn the new layout of the website, as well as the two versions that had different ‘Why Choose Us?’ sections. Due to the amount of faces being shown, however, we decided to scrap the section for the better. Since the main page is now 90% finalized, he suggested that I should start working on the individual pages for each section of the ‘flowchart’. The Making of Each Webpage I started doing my Read more
Weekly Review On 14th September, I showcased both versions of the website to Dr. Shawn, one with real photographs and the other with stock illustrations. He much preferred the version with real photographs, though he suggested to switch some photos around for better presentation. Working through Troubles One notable suggestion was the addition of a group photo with a lot of participants holding certificates with the judges in the ‘Why Choose Us?’ section. I had a bit of trouble doing Read more