Day 14?

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/Santa.txt

@@ -1,5 +1,5 @@
 Santa has caught up with the information age and does not trust
-clear-text commands anymore.
+clear-text commands anymore.  
 He has decided that all communications
 have to be encrypted to prevent an unfriendly take-over of his team.
 Santa chooses a simple, secure, and toolless encryption scheme.
@@ -7,24 +7,8 @@ However, his team's memory capacity is limited and so he can only use
 their names (Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donder and
 Blitzen) as keys.
 
-Dasher
-Dancer
-Prancer
-Vixen
-Comet
-Cupid
-Donder
-Blitzen
+
 
 Where is the team headed to?
 
-ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
-
-
 STTYN YATLOEP DNEA ONBL TGNTO MHEHH EISTIARIB FHSRA LD IIONA NL HERUV LN17-PTAA-RTON-RDOE-MCTN-AHCO
-
-                                                                      -4 +8 +0 +1
-                                                                       6  I  A  B
-                                                                       W  I  A  B
-                                                                       5  H  9  A
-                                                                      -0100 +1000 +0000 +0001

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/break_santa.py

@@ -1 +1,84 @@
 #!/usr/bin/python
+
+from itertools import chain, product, permutations
+
+# Santa has caught up with the information age and does not trust
+# clear-text commands anymore.
+# He has decided that all communications
+# have to be encrypted to prevent an unfriendly take-over of his team.
+# Santa chooses a simple, secure, and toolless encryption scheme.
+# However, his team's memory capacity is limited and so he can only use
+# their names (Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donder and
+# Blitzen) as keys.
+
+
+encrypted = "STTYN YATLOEP DNEA ONBL TGNTO MHEHH EISTIARIB FHSRA LD IIONA NL HERUV LN17-PTAA-RTON-RDOE-MCTN-AHCO"
+encrypted_words = encrypted.split(" ")
+
+def load_words():
+    with open('words_alpha.txt') as word_file:
+        valid_words = set(word_file.read().split())
+
+    return valid_words
+
+english_words = load_words()
+
+# totalCount = 0
+# letter_count = {}
+# for word in encrypted_words[:-1]:
+#     totalCount += len(word)
+#     for letter in word:
+#         if not letter in letter_count:
+#             letter_count[letter] = 1
+#         else:
+#             letter_count[letter] += 1
+
+# print(letter_count, totalCount)
+
+# def bruteforce(charset, minlength, maxlength):
+#     return (''.join(candidate)
+#         for candidate in chain.from_iterable(product(charset, repeat=i)
+#         for i in range(minlength, maxlength + 1)))
+#
+# def generateKey(cipher, plain):
+#     key = ""
+#     for i in range(min(len(cipher), len(plain))):
+#         key += chr(ord('A') + ord(cipher[i]) - ord(plain[i]))
+#     return key
+#
+def decrypt(cipher, key):
+    while len(key) < len(cipher):
+        key += key
+
+    return ''.join([chr(ord('A') + (ord(cipher[i]) + ord(key[i]) - 2 * ord('A')) % 26) for i in range(len(cipher))])
+
+
+possible_keys = ["DASHER","DANCER","PRANCER","VIXEN","COMET","CUPID","DONDER","BLITZEN"]
+
+
+# startingLetters = [key[0] for key in possible_keys]
+# processedKeys = []
+#
+# for p in permutations(startingLetters, len(startingLetters)):
+#     key = ''.join(p)
+#     if key not in processedKeys:
+#         processedKeys.append(key)
+#         plain = decrypt(encrypted_words[0], key)
+#         if plain.lower() in english_words:
+#             print(key, plain)
+
+for key in possible_keys:
+    print(key, decrypt(encrypted_words[0], key[::-1]))
+#
+# for key in bruteforce("ABCDEFGHIJKLMNOPQRSTUVXYZ", 5, 5):
+#     plain = decrypt(encrypted_words[0], key)
+#     if key.lower() in english_words and plain.lower() in english_words:
+#         print(key, plain)
+
+# for word in english_words:
+#     if len(word) == 5:
+#         word = word.upper()
+#         key = generateKey(encrypted_words[0], word).lower()
+#         # if key.isalpha():
+#         if key in english_words:
+#             print(word, key)