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Rail Fence cipher in python #121

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abranhe merged 2 commits into from
Nov 7, 2020
Merged

Rail Fence cipher in python #121

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e743b42
Added implementation of Hill_cipher In python
shivansh2310 Oct 5, 2020
dcbc0ea
Railfence Cipher implementation in cipher
shivansh2310 Oct 21, 2020
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42 changes: 42 additions & 0 deletions algorithms/cryptography/Hill_cipher.py
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Original file line number Diff line number Diff line change
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import numpy as np
s=list(input("Enter a string"))
c=[]
for i in range(len(s)):
c.append(ord(s[i])-65)

arr= np.array(c)

a1=np.transpose(arr)
print(a1)
a1= a1.reshape(3,1)
print(a1.shape)


#key input
print("Enter the key for the encryption")
R = int(input("rows:"))
C = int(input("columns:"))
matrix = []
print("Enter the key:")

for i in range(R):
a =[]
for j in range(C):
a.append(int(input()))
matrix.append(a)

for i in range(R):
for j in range(C):
print(matrix[i][j], end = " ")
matrix = np.array(matrix)
print(matrix.shape)
print(matrix[1][1])

mul=np.matmul(matrix,a1)
mul = np.array(mul)
print(mul.shape)
print(mul)
for i in range(R):
mul[i]=mul[i]%26

print(mul)
78 changes: 78 additions & 0 deletions algorithms/cryptography/railfence_cipher.py
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def railencrypt(st,k):
c = 0
x = 0
m =[[0] * (len(st)) for i in range(k)]
for r in range(len(st)):
m[c][r] = st[r]
if x == 0:
if c == (k-1):
x = 1
c -= 1
else:
c += 1
else:
if c == 0:
x = 0
c += 1
else:
c -= 1

result = []
for i in range(k):
for j in range(len(st)):
if m[i][j] != 0:
result.append(m[i][j])
print("CipherText:","" . join(result))

def raildecrypt(st,k):
c , x = 0 , 0
m =[[0] * (len(st)) for i in range(k)]
for r in range(len(st)):
m[c][r] = 1
if x == 0:
if c == (k-1):
x = 1
c -= 1
else:
c += 1
else:
if c == 0:
x = 0
c += 1
else:
c -= 1
result = []
c , x = 0 , 0
for i in range(k):
for j in range(len(st)):
if m[i][j] == 1:
m[i][j] = st[x]
x += 1
for r in range(len(st)):
if m[c][r] != 0:
result.append(m[c][r])
if x == 0:
if c == (k-1):
x = 1
c -= 1
else:
c += 1
else:
if c == 0:
x = 0
c += 1
else:
c -= 1
print("PlainText:","" . join(result))

if __name__ == "__main__":
string = input("Enter the Message:")
string = string.upper()
key = int(input("Enter the Key:"))
n = int(input("1.Encryption\n2.Decryption\nInput Your choice:"))
if(n == 1):
railencrypt(string,key)
elif(n == 2):
raildecrypt(string,key)
else:
print("Error")