In this post, we want to give you a brief introduction to TLS (Transport Layer Security), which is a technology widely used in combination with PostgreSQL to encrypt client / server connections.

What can we do to make ORDER BY RANDOM() query faster? Another great one Getting random rows faster. Very much faster

Code that has a predictable/repeat pattern through gain performance code from CPU branch prediction? if that prediction is wrong or the code has many if branch. the cpu has waste some compute? how much? read to know more.

When it comes to memory usage, there are two types of programs. The first type are programs that allocate memory in large blocks. The second type use data structures that require an allocation of a large number of chunks using malloc or new. They allocate a large number of chunks, it uses them for some time and then it returns them back to the system. This post tell about the second type and their cost.

It obviously way more complex than my one-person email forward app, but really interesting to see how big comapnies do these kind of stuff.

DNS, Email are one of things people always advised to buy, not build. So why replit did that?

Six 0days that allow a remote attacker to get full RCE on a box with no user interaction. MouseTrap is a suite of vulnerabilities and accompanying exploits that targets the RemoteMouse application and service. As of the release date 05/06/2021, the vulnerabilities have not been patched.

When I was working on my email forwarding app, I have lot of confusion such as MAIL FROM, RCPT vs FROM/TO in email header. MTA vs MSA. Why do we have to authenticate to send email out and why do we can send email in without authentication? Why port 25 vs 465 vs 587? This posts explain a lot of those concept.

What if I needed to shuffle a list but couldn’t hold the whole thing in memory? Or what if I didn’t want to shuffle a list, but just traverse it in a shuffled manner? (That is, visit each element once and only once, in a randomized way.) What if I wanted to traverse it, but didn’t want to precompute or store the traversal for some reason?