Write a program in Python that has TWO functions: Function One is called: _encry

Question

Write a program in Python that has TWO functions:

Function One is called: _encrypt

Function Two is called: _decrypt

Function one takes plain text, and assesses the indexed value of each letter in the string. For example, a=1, b=2. It then adds three to the indexed value, and produces encrypted text, based off of the plain text.

Function two reverses this.

Here is sample output:

_encrypt('how do you do')

Unsecured: howdoyoudo

Secured: lsahscsyhs

_decrypt('lsahscsyhs')

Unsecured: lsahscsyhs

Secured: howdoyoudo

Explanation / Answer

def _encrypt(s):
   ans =""
   for k in s:
       a1 = ord(k)
       a2 = ord('a')
       a3 = ord("a")
       if(a1-a2>=0 and a1-a2<=25):
           b1 = (a1-a2+4)%26+a2
           ans = ans+chr(b1)
       elif(a1-a3>=0 and a1-a3<=25):
           b1 = (a1-a3+4)%26+a3
           ans = ans+chr(b1)
   return ans
def _decrypt(s):
   ans =""
   for k in s:
       a1 = ord(k)
       a2 = ord('a')
       a3 = ord("a")
       if(a1-a2>=0 and a1-a2<=25):
           b1 = (a1-a2+22)%26+a2
           ans = ans+chr(b1)
       elif(a1-a3>=0 and a1-a3<=25):
           b1 = (a1-a3+22)%26+a3
           ans = ans+chr(b1)
   return ans
s = _encrypt("how do you do")
print(s)
print(_decrypt(s))

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