Using C ++Password Strength Checker Program

Given a string input containing password characters, the task is to check the strength of the password.

The strength of the password is when you are told whether the password is easy to guess or crack. The strength should vary from weak, moderate, and strong to different. To check the strength, we must check the following points:

• The password length must be at least8characters.

• It must contain1lowercase letters.

• It must contain1uppercase letters

• It must contain a digit

• It must contain a special character, such as: !@#$%^&*> <,.+ =-

like there is a password “w3codebox” is easy to guess, so we can conclude that the password “weak” he provided is because it only contains lowercase letters, while the password “w3codebox @ 863!” which has both uppercase and lowercase letters, numbers, and special characters, and is strong, and its length is greater than8characters, therefore satisfying all conditions that make the password stronger.

If some passwords have more than half of the features of a strong password, then we will consider the password as a moderate password. Like the password “w3codebox12like, it will be considered as moderate because it contains lowercase letters, a digit, and its length is greater than8characters.

Example

Input: w3codebox!@12
Output: Password strength:-Strong
Explanation: The password has　1　lowercase,　1　uppercase,　1　special character, more than　8　characters long and a digit, hence the password is strong.
Input: w3codebox
Output: Password strength:-Weak

The method we will use to solve the given problem-

• Output the string as the password.

• Check if all factors can be used to judge the strength of the password.

• Print the strength of the password based on factors.

Algorithm

Start
　　　Step　1　⇒ In function void printStrength(string& input)
　　　　　　Declare and initialize n = input.length()
　　　　　　Declare bool hasLower = false, hasUpper = false
　　　　　　Declare bool hasDigit = false, specialChar = false
　　　　　　Declare string normalChars = "abcdefghijklmnopqrstu"
　　　　　　"vwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"1234567890 "
　　　　　　Loop For i = 0 and i < n and i++
　　　　　　　　　If (islower(input[i]))
　　　　　　　　　　　　Set hasLower = true
　　　　　　　　　If (isupper(input[i]))
　　　　　　　　　　　　Set hasUpper = true
　　　　　　　　　If (isdigit(input[i]))
　　　　　　　　　　　　Set hasDigit = true
　　　　　　　　　　　　Set size_t special = input.find_first_not_of(normalChars)
　　　　　　　　　If (special != string::npos)
　　　　　　　　　　　　Set specialChar = true
　　　　　　End Loop
　　　　　　Print "Strength of password:"-"
　　　　　　If (hasLower && hasUpper && hasDigit &&
　　　　　　　　　specialChar && (n >=　8))
　　　　　　　　　Print "Strong"
　　　　　　else if ((hasLower || hasUpper) &&
　　　　　　　　　　　　specialChar && (n >=　6))
　　　　　　　　　Print "Moderate"
　　　　　　else
　　　　　　　　　print "Weak"
　　　Step　2　⇒ In function int main() Declare and initialize input = "w"3codebox!@12"
　　　　　　printStrongNess(input)
Stop

Example

#include <iostream>
using namespace std;
void printStrongNess(string& input) {
　　　int n = input.length();
　　　//Check the lowercase letters in the string
　　　bool hasLower = false, hasUpper = false;
　　　bool hasDigit = false, specialChar = false;
　　　string normalChars = "abcdefghijklmnopqrstu" "vwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"1234567890 ";}}
　　　for (int i = 0; i < n; i++) {
　　　　　　if (islower(input[i]))
　　　　　　　　　hasLower = true;
　　　　　　if (isupper(input[i]))
　　　　　　　　　hasUpper = true;
　　　　　　if (isdigit(input[i]))
　　　　　　　　　hasDigit = true;
　　　　　　size_t special = input.find_first_not_of(normalChars);
　　　　　　if (special != string::npos)
　　　　　　　　　specialChar = true;
　　　}
　　　//Password Strength
　　　cout << "Strength of password:-";
　　　if (hasLower && hasUpper && hasDigit &&
　　　　　　specialChar && (n >=　8))
　　　　　　cout << "Strong" << endl;
　　　else if ((hasLower || hasUpper) &&
　　　　　　specialChar && (n >=　6))
　　　　　　cout << "Moderate" << endl;
　　　else
　　　　　　cout << "Weak" << endl;
}
int main() {
　　　string input = "w3codebox!@12";
　　　printStrongNess(input);
　　　return 0;
}

Output result

Strength of password:-Moderate