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Google Public NTP [AS15169]:

time.google.com

time1.google.com

time2.google.com

time3.google.com

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/*
    robin verton, dec 2015
    implementation of the RC4 algo
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define N 256   // 2^8

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from itertools import permutations


def match(pattern, constraints):
    return (perm
        for perm in permutations(constraints, len(pattern))
        if all(p(c) for p, c in zip(pattern, perm))
    )

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Boolean Algebra in a nutshell for JS/TS programmers

There are a lot of strategies that you will hear about in the Javascript community for keeping your conditionals from becoming a tangled mess. This isn't like them. This is someting different. MATH! Boolean Algebra to be exact. I use it all the time to simplify complex conditionals. There are two things that you need to know: de Morgan's Theorem, and Karnaugh (pronounced CAR-no) Maps. (Don't worry, there is no test)

de Morgan's Theorem

De Morgan's Theorem is great distributing nots (!), and for when you want to convert an && to an ||, or back. This is it:

 !(A && B) = !A || !B

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#!/usr/bin/env python3


class ToddCoxeter:
    def __init__(self):
        self.nodes = [0]
        self.edges = None
        self.kappa = []
        self.next_node = 1
        self.R = []

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Tesla Key Card Protocol

Researched by Robert Quattlebaum [email protected].

Last updated 2020-02-03.