aadit/MIT-Curricular
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Modified Lab 1 IS

Browse source
This commit is contained in:
sherlock 2025-08-05 07:23:18 +05:30
parent fdc634b589
commit 933a52b3a8
8 changed files with 166 additions and 384 deletions
Download patch file Download diff file Expand all files Collapse all files

10
IS/Lab/Lab1/q1_monosub.py
View file

@ -1,6 +1,7 @@
## ptext = plaintext
## ctext = ciphertext
## mk = multiplicative key
## ak = additive key
from collections import defaultdict
def add_cipher_en(ptext, ak):
result = ""
@ -76,6 +77,10 @@ def affine_de(ctext, ak, mk):
result += chr((((ord(ch) - 97 - ak) * inverse) % 26) + 97)
return result
def mult_inverse(mk):
inverse = pow(mk, -1, 26)
return inverse
def operator(argument,ptext,ak,mk):
match argument:
case '1':
@ -91,6 +96,7 @@ def operator(argument,ptext,ak,mk):
print("Multiplicative Key: ", mk)
ctext = mult_cipher_en(ptext, mk)
print("Ciphertext: ", ctext)
print("Multiplicative Inverse: ", mult_inverse(mk))
print("Decrypted Text: ", mult_cipher_de(ctext, mk))
case '3':
print("Affine Cipher")
@ -99,6 +105,7 @@ def operator(argument,ptext,ak,mk):
print("Multiplicative Key: ", mk)
ctext = affine_en(ptext, ak, mk)
print("Ciphertext: ", ctext)
print("Affine Inverse: ", mult_inverse(mk))
print("Decrypted Text: ", affine_de(ctext, ak, mk))
case '4':
print("Goodbye")
@ -122,6 +129,5 @@ def main():
op = input("Enter your choice of operation: ")
operator(op, ptext, ak, mk)
if __name__ == '__main__':
main()