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How many times does it happens with us that we use our professional skills to solve daily life problems. For software developers, it would hardly happen that they write a piece of code for themself. Recently it happened to me. Not sure how but one of my personal bank accounts had the wrong personal details. They sent me statement in a password-protected file, but when I was trying to open the file it prompted "Incorrect Password". I was urgent and I had to view the information in that file. Cutting long story short, I decided to crack the password of the file.&nbsp;
So the password was, first four letters of my name followed by the date of birth.&nbsp;
<ol>
<li>First four characters of name .</li>
<li>date of birth DDMM format.&nbsp;</li>
</ol>
Since in other communication, they had my correct name. So I knew I don't have to work on the first condition.It has to be the second condition which I have to crack.&nbsp;
So wrote a Python program to loop through all the dates of the year and try to open the file. Its a tedious and boring task if you do it manually but for computers it's a piece of cake.&nbsp;
so here goes the program for you guys.&nbsp;
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<pre class="language-python"><code>from datetime import timedelta, date
import pikepdf
import datetime
dt = datetime.date(2015, 1, 20)
print(dt.day)

start_date = date(2021, 1, 1)
end_date = date(2022, 1, 1)
def daterange(start_date, end_date):
    for n in range(int((end_date - start_date).days)):
        yield start_date + timedelta(n)
        
def open_pdf(f,msg):
    with pikepdf.open(f,password=msg) as pdf:
        num_pages = len(pdf.pages)
        print("Total pages:", num_pages)
        
for single_date in daterange(start_date, end_date):
    msg = "Name"+single_date.strftime("%d%m")

try:
 open_pdf("icici.pdf",msg)
 print(msg)
 except:
 print(end='')</code></pre>
and finally above program will print the password which opened the file. the fun part is you can crack any password if you have a hint of the password.&nbsp;
So the learning is, Keep your password as strong as possible so that it cannot be broken easily.&nbsp;
The purpose of this article is to share the use case of programming in daily life.&nbsp;
Have fun!
&nbsp;

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