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First solution in Clear category for ADFGVX Cipher by Sim0000
MAGIC = 'ADFGVX'
def encode(message, secret_alphabet1, keyword):
# remove duplicate character from keyword -> key
# keyword = 'checkio' -> key = ['c','h','e','k','i','o']
key = []
for c in keyword:
if c not in key: key.append(c)
# make sort index -> k
# keyword = 'cipher' -> k = [0, 4, 3, 2, 1, 2, 5]
n = len(key)
k = sorted(range(n), key=lambda i: key[i])
# encode
# message = 'I am going' ->
# s = ['F','A','D','V','A','G','X','X','D','X','F','A','G','D','X','X']
s = []
for c in message.lower():
if c.isalpha() or c.isdigit():
row, col = divmod(secret_alphabet1.index(c), 6)
s += [MAGIC[row], MAGIC[col]]
# reorder
# reorder index = [0, 6, 12, 4, 10, 3, 9, 15, 1, 7, 13, 2, 8, 14, 5, 11]
return ''.join(s[j] for i in k for j in range(i, len(s), n))
def decode(message, secret_alphabet1, keyword):
# remove duplicate character from keyword -> key
# keyword = 'checkio' -> key = ['c', 'h', 'e', 'k', 'i', 'o']
key = []
for c in keyword:
if c not in key: key.append(c)
# make sort index -> k
# keyword = 'cipher' -> k = [0, 4, 3, 2, 1, 2, 5]
n = len(key)
k = sorted(range(n), key=lambda i: key[i])
# make reorder index
# len(message) == 16 ->
# x = [0, 6, 12, 4, 10, 3, 9, 15, 1, 7, 13, 2, 8, 14, 5, 11]
m = len(message)
x = [j for i in k for j in range(i, m, n)]
# reorder
# message = 'FXGAFVXXAXDDDXGA' ->
# y = ['F','A','D','V','A','G','X','X','D','X','F','A','G','D','X','X']
y = ['']*m
for i, c in zip(x, message): y[i] = c
# decode
# y -> s = ['i','a','m','g','o','i','n','g']
s = []
for i in range(0, m, 2):
row, col = y[i:i+2]
s.append(secret_alphabet1[6 * MAGIC.index(row) + MAGIC.index(col)])
return ''.join(s)
if __name__ == '__main__':
assert encode("I am going",
"dhxmu4p3j6aoibzv9w1n70qkfslyc8tr5e2g",
"cipher") == 'FXGAFVXXAXDDDXGA', "encode I am going"
assert decode("FXGAFVXXAXDDDXGA",
"dhxmu4p3j6aoibzv9w1n70qkfslyc8tr5e2g",
"cipher") == 'iamgoing', "decode I am going"
assert encode("attack at 12:00 am",
"na1c3h8tb2ome5wrpd4f6g7i9j0kjqsuvxyz",
"privacy") == 'DGDDDAGDDGAFADDFDADVDVFAADVX', "encode attack"
assert decode("DGDDDAGDDGAFADDFDADVDVFAADVX",
"na1c3h8tb2ome5wrpd4f6g7i9j0kjqsuvxyz",
"privacy") == 'attackat1200am', "decode attack"
assert encode("ditiszeergeheim",
"na1c3h8tb2ome5wrpd4f6g7i9j0kjqsuvxyz",
"piloten") == 'DFGGXXAAXGAFXGAFXXXGFFXFADDXGA', "encode ditiszeergeheim"
assert decode("DFGGXXAAXGAFXGAFXXXGFFXFADDXGA",
"na1c3h8tb2ome5wrpd4f6g7i9j0kjqsuvxyz",
"piloten") == 'ditiszeergeheim', "decode ditiszeergeheim"
Sept. 18, 2014
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