Random Knowledge

07/05/19

Nib File

A resource file used to store user interfaces of iOS and Mac apps. It is an interface builder used to design the virtual parts of the app - such as windows and views - and sometimes to configure non-visual objects, such as the controller objects that your app uses to manage its windows and views.
The object graph is crated when we edit this file and archived when it is saved. When we load the file the object graph is unarchived.
This fie contains static GUI design and it's relationship to other program resources.

Things needed to open Nib file:

The NIB file cannot be opened in Windows as the Apple Interface Builder(used to develop applications for iPhone), installed on a Mac, is required.

Steps to open Nib file:

1. Open the Apple Interface Builder on a Mac.

2. Click the “File” option on the top navigation bar, then click “Open.” A file navigation window opens.
3. Navigate to and click on the NIB file. The file appears in the left pane, or the “project navigator” in Interface Builder.

4. Click on the NIB file in the project navigator to open the file in the Interface Builder editor.


06/10/2019

www.shodan.io

Shodan is the world's first search engine for Internet-connected devices.
Shodan has servers located around the world that crawl the Internet 24/7 to provide the latest Internet intelligence. Who buys Smart TVs? Which countries are building the most wind farms? What companies are affected by Heartbleed? Shodan provides the tools to answer questions at the Internet-scale.
Shodan provides a public API that allows other tools to access all of Shodan's data. Integrations are available for Nmap, Metasploit, Maltego, FOCA, Chrome, Firefox and many more.

ascii2hex.com

ROT-13 Encryptor & Decryptor

ROT-X (ROT is short for rotate and "X" refers to a variable number of letters to shift)allows you to encrypt plain text. The most famous is ROT13, in which each letter is shifted halfway through the alphabet. And there is a ROT13 font that makes it easy to see and use.
ROT-X is simple to decrypt, because to undo the first rotate , you should rotate again by 26 - X. So a ROT13 will reverse a ROT13, a ROT6 will reverse a ROT20, etc.

Perrin number

In mathematics, the Perrin numbers are defined by the recurrence relation
    P(n) = P(n − 2) + P(n − 3) for n > 2,
with initial values
    P(0) = 3, P(1) = 0, P(2) = 2.
The number of different maximal independent sets in an n-vertex cycle graph is counted by the nth Perrin number for n > 1.

Erdős–Woods number

In number theory, a positive integer k is said to be an Erdős–Woods number if it has the following property: there exists a positive integer a such that in the sequence (a, a + 1, …, a + k) of consecutive integers, each of the elements has a non-trivial common factor with one of the endpoints. In other words, k is an Erdős–Woods number if there exists a positive integer a such that for each integer i between 0 and k, at least one of the greatest common divisors gcd(a, a + i) and gcd(a + i, a + k) is greater than 1.
The first few Erdős–Woods numbers are
    16, 22, 34, 36, 46, 56, 64, 66, 70 … (sequence A059756 in the OEIS).
(Arguably 0 and 1 could also be included as trivial entries.)