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Add a rot13 cipher in response to Issue #7 #13

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merged 1 commit into from
Oct 24, 2019
Merged

Add a rot13 cipher in response to Issue #7 #13

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21 changes: 21 additions & 0 deletions Ciphers/rot13.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
#rot13
OFFSET_LOWER = ord('a')
OFFSET_UPPER = ord('A')

def rot13(text):
rot13_text = ''
for i in range(len(text)):
ch = text[i]
if ch.isalpha():
if(ch.islower()):
offset = OFFSET_LOWER
else:
offset = OFFSET_UPPER
rot13_text += chr(((ord(ch)-offset+13)%26+offset))
else:
rot13_text += ch
return rot13_text

plain_text = input("Enter the string: ")
print(rot13(plain_text))
print(rot13(rot13(plain_text)))