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encryption/decryption with multiple keys
...r are big prime numbers
fi(m)=(p-1)(q-1)(r-1)
d==(e1*e2*e3*...*ei)^(-1) (mod fi(m)); e1...ei are arbitrary numbers, d is calculated to fulfill the equation
y1==x^e1 (mod m)
y2==y1^e2 (mod m)
y3==y2^e3 (mod m)
...
x==yi^d (mod m)
This algorithm could be used for example to increase the speed ...
How to round up to the nearest 10 (or 100 or X)?
...Y interval
You can easily round numbers to a specific interval using the modulo operator %%.
The function:
round.choose <- function(x, roundTo, dir = 1) {
if(dir == 1) { ##ROUND UP
x + (roundTo - x %% roundTo)
} else {
if(dir == 0) { ##ROUND DOWN
x - (x %% roundTo)
}
...
Algorithms based on number base systems? [closed]
... passed down to the ancient
Babylonians, and it is still used — in
a modified form — for measuring time,
angles, and the geographic coordinates
that are angles." source
etc...
This list is a good starting point.
...
Can't use modulus on doubles?
...+ (compiled using g++). I'm trying to apply two doubles as operands to the modulus function, but I get the following error:
...
Internal Error 500 Apache, but nothing in the logs?
...The errors that cause your 500 Internal Server Error are coming from a PHP module. By default, PHP does NOT log these errors. Reason being you want web requests go as fast as physically possible and it's a security hazard to log errors to screen where attackers can observe them.
These instructions...
NtMapViewOfSection注入 - C/C++ - 清泛网 - 专注C/C++及内核技术
...注入方式:利用一个未公开函数NtMapViewOfSection在远程进程地址空间写入代码，并且用一种新的技术在远程进程中执行它，这种技术完全工...新的注入方式:利用一个未公开函数NtMapViewOfSection在远程进程地址空间写入代码，并且用一...
虚拟机ubuntu与宿主机NAT方式设定静态IP共享上网 - 更多技术 - 清泛网 - 专...
...态，NAT网络模式要用的就是这个虚拟网卡，这个网卡的ip地址不需要手动设置，在需要使得虚拟的系统有固定IP时也可以选择手动设置。
接下来，在虚拟机（不止一个虚拟机，请选择安装ubuntu的虚拟机）设置网卡的连接方式，菜...
单页web应用（SPA）的简单介绍 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...藏的方式有很多种，比较好的选择为以下两种：
1.监听地址栏中hash变化驱动界面变化
2.用pushsate记录浏览器的历史，驱动界面发送变化
如何搭建一个基础的SPA
首先，我们画出三个div，它们实际上是作为三个界面存在界...
How to write a switch statement in Ruby
... also create your own comparators easily using a Struct with a custom ===
Moddable = Struct.new(:n) do
def ===(numeric)
numeric % n == 0
end
end
mod4 = Moddable.new(4)
mod3 = Moddable.new(3)
case number
when mod4 then puts 'multiple of 4'
when mod3 then puts 'multiple of 3'
end
(Example...
C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...含指针的关联容器时，容器将会按照指针的值（就是内存地址）进行排序，绝大多数情况下，这不是你所希望的。
第21条：总是让比较函数在等值情况下返回false。
现在我给你演示一个很酷的现象。创建一个set，用less_equal作...