No this isn’t crypto currency. The Joy of Cryptography is a free undergraduate textbook that introduces students to the fundamentals of provable security.

JavaScript is an impressive technology. Not because it’s particularly well-designed (it isn’t). Not because almost every single consumer device with internet access in the world has executed a JavaScript program. Instead, JavaScript is impressive because almost every single feature of the language makes it a nightmare to optimize and yet, it is fast.

A software bug where the network stack crashes in reaction to a single received network packet, taking down the whole operating system with it.

When optimization, we optimize our code, what if the compiler optimize its own to emit more efficient assembly code, therefore make your code run faster than before. This is the case for Go, though it’s still a good read for everyone to understand more about assembly and register vs stack based function calling.

With more than 1.5M room nights booked per day, Booking.com requires a solid infrastructure that’s constantly monitored. Booking.com now has a footprint of 50,000+ physical servers running across four data centers and six additional points of presence. The sheer size of this server fleet makes it viable for Booking.com to have dedicated teams specializing into looking only at the reliability of those servers.

A bank for sure has a lot of secret key they would like to keep secure. In this post, monzo, a modern bank shares how they levrage PKI(Public Key Infrastructure) to do authentication and authorization. It’s crazy insane how deep they secure their system

Let’s make a gzipped file and see what’s in it. We’ll keep it simple: just write 8 ‘a’s to a file and see what is the final gzip file and decode it by hand, looking at byte by byte.

Introducing QOI — the Quite OK Image format. It losslessly compresses RGB and RGBA images to a similar size of PNG, while offering a 20x-50x speedup in compression and 3x-4x speedup in decompression. All single-threaded, no SIMD. It’s also stupidly simple.

We constantly hear that indexes improve read performance and it’s usually true, but we also know that it will always have an impact on writes. What we don’t hear about too often is that in some cases, it may not give any performance improvement at all. This happens more than we want and might happen more than we even notice, and foreign keys (FKs) are a great example. I’m not saying that all FK’s indexes are bad, but most of the ones I’ve seen are just unnecessary, only adding load to the system.