8000 Railfence Cipher implementation in cipher · ImadBel-code/python@dcbc0ea · GitHub
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shivansh2310shivansh2310
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Railfence Cipher implementation in cipher
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‎algorithms/cryptography/railfence_cipher.py

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def railencrypt(st,k):
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c = 0
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x = 0
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m =[[0] * (len(st)) for i in range(k)]
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for r in range(len(st)):
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m[c][r] = st[r]
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if x == 0:
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if c == (k-1):
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x = 1
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c -= 1
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else:
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c += 1
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else:
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if c == 0:
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x = 0
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c += 1
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else:
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c -= 1
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result = []
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for i in range(k):
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for j in range(len(st)):
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if m[i][j] != 0:
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result.append(m[i][j])
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print("CipherText:","" . join(result))
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def raildecrypt(st,k):
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c , x = 0 , 0
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m =[[0] * (len(st)) for i in range(k)]
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for r in range(len(st)):
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m[c][r] = 1
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if x == 0:
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if c == (k-1):
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x = 1
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c -= 1
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else:
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c += 1
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else:
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if c == 0:
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x = 0
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c += 1
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else:
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c -= 1
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result = []
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c , x = 0 , 0
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for i in range(k):
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for j in range(len(st)):
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if m[i][j] == 1:
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m[i][j] = st[x]
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x += 1
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for r in range(len(st)):
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if m[c][r] != 0:
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result.append(m[c][r])
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if x == 0:
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if c == (k-1):
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x = 1
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c -= 1
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else:
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c += 1
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else:
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if c == 0:
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x = 0
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c += 1
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else:
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c -= 1
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print("PlainText:","" . join(result))
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if __name__ == "__main__":
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string = input("Enter the Message:")
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string = string.upper()
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key = int(input("Enter the Key:"))
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n = int(input("1.Encryption\n2.Decryption\nInput Your choice:"))
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if(n == 1):
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railencrypt(string,key)
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elif(n == 2):
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raildecrypt(string,key)
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else:
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print("Error")

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