Note: this post is an ironic observation on the cyclical nature of history. This observation itself does not have any practical benefit, but in its essence it is very accurate, so I decided that it should be shared with the audience. And of course, see you in the comments. Last week, the laptop I use for MacOS development announced that an Xcode update is available. I tried to install it, but the system reported that it did not have enough free disk space to run the installation program. ...

Read more >>> Date release: 2019-10-15

Sometime in 2014, in the dumps of the BSD 3 source tree, I found the / etc / passwd file with the passwords of all veterans such as Dennis Richie, Ken Thompson, Brian W. Kernigan, Steve Bourne and Bill Joy. The crypt algorithm was used for these hashes ( 3) based on DES - known for its weakness (and with a password length of maximum 8 characters). Therefore, I thought it would be easy to crack these passwords for fun. Take the standard john and hashcat...

Read more >>> Date release: 2019-10-10

Despite the yellow heading, there will be no yellow article further. All of us (I hope it is here that I can finally say from the whole community) have already gotten the actions of Roskomnadzor. And also its constant appearance in recommended on a habr. Therefore, you will like this news. At least something important. News by the way back from December...

Read more >>> Date release: 2019-09-24

Take the laser scanner (it is something like lidar) — the thing that should be set on a tripod and press the button. Thing laser beam encircles everything he sees, and stores the obtained cloud of points. It looks like the laser rangefinder, only one pass is calculated several million distances. A million per second.It turns out something like this (actually this is the result of post-processing, because first it turns out just the matrix numbers). You take this thing and carry on all floors...

Read more >>> Date release: 2019-09-17

The mathematicians finally managed to find three cubes of numbers, the sum of which is 42. So the problem was solved, over which they racked their brains for as many as 65 years: can each of the natural numbers from 1 to 100 be expressed as the sum of three cubes? The problem formulated in 1954 , lies precisely in this: x3 + y3 + z3 = k. K is each of the numbers from 1 to 100; the question is, what are x, y and z? Over the past decades, solutions have been found for the lightest numbers. In...

Read more >>> Date release: 2019-09-16

Have long been formulated for this approach. Perhaps it's obvious, but the worse this gets. First the items. Never ask and don't praise employees for:time has come to work or obeidat in accordance with the dress codesdefaults at work, working for vychodniho not all examples of specifically chosen simple and obvious, but to explain the good fit.Please note that it's not just about "don't praise", but about "not require". Surprised to have recently found out that still a large number of companies...

Read more >>> Date release: 2019-09-08