空密码
一种空密码，也称为隐藏密码，是一种古老的加密形式，其中明文与大量非密码材料混合。今天它被认为是一种简单的隐写术，可以用来隐藏密文。 使用空密码有多种选择。这里我们依次取每个单词的首字母。可以选择该模式来提高加密级别其他选项可以是:
- 从每个单词中提取最后一个字母。
- 把信从特定的位置拿走
- 使用模式(1，2，3，1，2，3[每个单词中的每个字母])。您也可以使用其他模式。
- 将重要字母放置在标点符号或特定字符旁边或按一定间隔放置。
连续取每个单词第一个字母的空密码
包含空密码的消息的更多示例:
Input will be one paragraph or sentence without any newline.
Input : News Eight Weather: Tonight increasing snow.
Unexpected precipitation smothers eastern
towns. Be extremely cautious and use snowtires
especially heading east. The [highway is not]
knowingly slippery. Highway evacuation is
suspected. Police report emergency situations
in downtown ending near Tuesday.
Explanation:
Taking the first letter in each word successively yields
the real message.
Here we are converting decoded message to lowercase.
News Eight Weather: Tonight Increasing Snow.
Unexpected Precipitation Smothers Eastern
Towns. Be Extremely Cautious And Use Snowtires
Especially Heading East. The [Highway Is Not]
Knowingly Slippery. Highway Evacuation Is
Suspected. Police Report Emergency Situations
In Downtown Ending Near Tuesday.
Output :
After Deciphered : newtisupsetbecausehethinksheispresident
After breaking the words manually the output will be:
Newt is upset because he thinks he is President
C++
// CPP program to decode NULL CIPHER
#include <bits/stdc++.h>
using namespace std;
string decode(string str)
{
// Store the decoded string.
string res = "";
// found variable is used to tell that the encoded
// encoded character is found in that particular word.
bool found = false;
for (int i = 0; i < str.size(); i++)
{
// Set found variable to false whenever we find
// whitespace, meaning that encoded character for
// new word is not found
if (str[i] == ' ')
{
found = false;
continue;
}
if (!found)
{
if (str[i] >= 'A' && str[i] <= 'Z')
{
res += str[i] + 32;
found = true;
}
else if (str[i] >= 'a' && str[i] <= 'z')
{
res += str[i];
found = true;
}
}
}
return res;
}
// Driver code
int main()
{
string in;
in = "A Step by Step Guide for Placement Preparation by GeeksforGeeks";
cout << "Enciphered Message: ";
// Function call
cout << decode(in) << endl;
return 0;
}
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to decode NULL CIPHER
class GFG
{
// Function to decode the message.
static String decode(String str)
{
// Store the decoded string
String res = "";
// found variable is used
// to tell that the encoded
// encoded character is
// found in that particular word.
boolean found = false;
for (int i = 0; i < str.length(); i++)
{
// Set found variable to false
// whenever we find
// whitespace, meaning that
// encoded character for
// new word is not found
if (str.charAt(i) == ' ')
{
found = false;
continue;
}
if (!found)
{
if ((str.charAt(i) >= 'A' && str.charAt(i) <= 'Z') ||
(str.charAt(i) >= 'a' && str.charAt(i) <= 'z'))
{
res += Character.toString(str.charAt(i));
found = true;
}
}
}
return res.toLowerCase();
}
// Driver Code
public static void main(String[] args)
{
String in;
in = "A Step by Step Guide for Placement Preparation by GeeksforGeeks";
System.out.println("Enciphered Message: " + decode(in));
}
}
// This code is contributed by Vivek Kumar Singh
Python 3
# Python program to decode NULL CIPHER
# Function to decode the message.
def decode(string):
# Store the decoded string
res = ""
# found variable is used
# to tell that the encoded
# encoded character is
# found in that particular word.
found = False
for character in string:
# Set found variable to false
# whenever we find
# whitespace, meaning that
# encoded character for
# new word is not found
if character == ' ':
found = False
continue
if not found:
if character>='A' and character<='Z' or character>='a' and character<='z':
res += character
found = True
return res.lower()
# Driver code
if __name__ == "__main__":
input = "A Step by Step Guide for Placement Preparation by GeeksforGeeks"
print("Enciphered Message:",decode(input))
# This code is contributed by Vivek Kumar Singh
C
// A C# program to decode NULL CIPHER
using System;
class GFG
{
// Function to decode the message.
static String decode(String str)
{
// Store the decoded string
String res = "";
// found variable is used
// to tell that the encoded
// encoded character is
// found in that particular word.
Boolean found = false;
for (int i = 0; i < str.Length; i++)
{
// Set found variable to false whenever we find
// whitespace, meaning that encoded character for
// new word is not found
if (str[i] == ' ')
{
found = false;
continue;
}
if (!found)
{
if (str[i] >= 'A' && str[i] <= 'Z')
{
res += (char)(str[i] + 32);
found = true;
}
else if (str[i] >= 'a' && str[i] <= 'z')
{
res += (char)str[i];
found = true;
}
}
}
return res;
}
// Driver Code
public static void Main(String[] args)
{
String str;
str = "A Step by Step Guide for Placement Preparation by GeeksforGeeks";
Console.WriteLine("Enciphered Message: " + decode(str));
}
}
// This code has been contributed by 29AjayKumar
java 描述语言
<script>
// Javascript program to decode NULL CIPHER
// Function to decode the message.
function decode(str)
{
// Store the decoded string
let res = "";
// found variable is used
// to tell that the encoded
// encoded character is
// found in that particular word.
let found = false;
for (let i = 0; i < str.length; i++)
{
// Set found variable to false
// whenever we find
// whitespace, meaning that
// encoded character for
// new word is not found
if (str[i] == ' ')
{
found = false;
continue;
}
if (!found)
{
if ((str[i] >= 'A' && str[i] <= 'Z') ||
(str[i] >= 'a' && str[i] <= 'z'))
{
res += (str[i]);
found = true;
}
}
}
return res.toLowerCase();
}
// Driver Code
let In = "A Step by Step Guide for Placement Preparation by GeeksforGeeks";
document.write("Enciphered Message: " + decode(In));
// This code is contributed by rag2127
</script>
输出:
Enciphered Message: asbsgfppbg
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