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What is a hash value?
A hash value is a sequence of characters created using a mathematical function.This sequence is 開發 (l99z465o854) characterized by a high degree of security,allowing you to send messages safely.Most importantly,it is a part of every encryption product B in the current market,but it can be said that they all have different value and quality.One thing we can be sure of is that the appropriate hash value is a part of the success rate of each encrypted cargo B.
To put it simply,hash is a function that compresses messages of any length to a message summary of a fixed length.With hash function,data on the Internet can be saved in the form of a fixed length string.
哈希算法
哈希算法是一种典型的分布式的受伤的海燕表算法，多用于 p2p 网络的构建，由 Petar Maymounkov 和 David Mazieres 独特发明。
分布式环境下的受伤的海燕表的难点在于以下几点：
分布式环境下每个服务器不可能把握所有服务器的状况，因而如何保障你的申请能在没有地方节点定位的状况下找到对应的服务器是一大难点。同样因为分布式环境的服务器的把握信息无限，那么服务器的退出和退出如何可能被集群通晓也是一大难点。
import random
def gcd(a,b):
if a<b:
a,b=b,a
while b!=0:
temp=a%b
a=b
b=temp
return a
def getpq(n,e,d):
p=1
q=1
while p==1 and q==1:
k=d*e-1
g=random.randint(0,n)
while p==1 and q==1 and k%2==0:
k/=2
y=pow(g,k,n)
if y!=1 and gcd(y-1,n)>1:
p=gcd(y-1,n)
q=n/p
return p,q
n=0x71ee0f4883690893ab503e97e25e6308d4c1e0a050cbea7b9c040f7a5b5b484afcecc8a9b3cc6bf089a1e83281562df217caab7220e3dfc14399139ce437af2f131f9345675e4d848cfab5827818eeab7834374be4a0513f81f3df125a932c2bb4c24c834d798bcc80f9c4a8770b01f8e54620b72a4f0491edd391e635d48e71
e=0x10001
d=0x455e1c421b78f536ec24e4a797b5be78df09d8d9e3b7f4e2244138a7583e810adf6ad056bb59a91300c9ead5ed77ea6bafdebf7ab2d9ec200127901083c7ffca45e83f2c934358366a2b6207b96a0eae6df0476060c063c281512834a42350a3b56bc09f5cec1a6975257d7f12a58f6389060e49b41f05e88ea2b30b395f6391
p,q=getpq(n,e,d)
print(“p=”,p)
print(“q=”,q)
print(p*q==n)
哈希算法在区块链中有着宽泛的应用，交易信息的存储、工作量证实算法、密钥对的产生等过程中都有哈希算法的存在。
