Progress

Day 4/decode.py

@@ -3,16 +3,24 @@
 # URL: https://hackvent.hacking-lab.com/Pirates_123/
 
 s = '::)"<.vd]!&a{":r>Qyh 7';
+
 length = len(s)
 f='HV18-';
 
 # indizes: 4, 9, 14, 19
 # xxxx-xxxx-xxxx-xxxx
+# correctKey = "1xxx1xxx"
 correctKey = "00000000"
 for i in range(4):
     pos = 4 + i*5
     key = ord(s[pos]) ^ ord('-')
-    correctKey += "%02d%s" % (key, "00000000")
+    correctKey += "%02d" % key
+    correctKey += "00000000"
+
+    # if len(correctKey) % 4 == 0:
+    #     correctKey += "1xxx1xxx"
+    # else:
+    #     correctKey += "xx1xxx1x"
 
 for i in range(length):
     a = ord(s[i])
@@ -23,9 +31,9 @@ upperBytes = ["15", "17"]
 lowerBytes = ["12", "84"]
 
 data = [correctKey[i:i+4] for i in range(0, len(correctKey), 4)]
-print(correctKey)
 print(data)
-print(f)
+print(correctKey)
+print(f.encode("utf-8"))
 
 js = ""
 for i in range(len(data)):
@@ -45,4 +53,4 @@ print(js)
 
 
 # 000000001700008400121500000015001700008400000000
-# 000000001700000000120000000015000000008400000000
+#

Day 5/decode.py

@@ -0,0 +1,10 @@
+#!/usr/bin/python
+
+in1 = "10:a2:a3:2d:60:2e:43:0f:9d:a1:12:5b:fa:1c:36:4e:6c:e2:de:e0:57:3d:8a:69:5a:24:fc:e8:f6:f3:f5:ce"
+in1_bytes = [int(x, 16) for x in in1.split(":")]
+print(in1_bytes)
+print(len(in1_bytes))
+
+in2 = in1.replace(":", "")
+d = int(in2, 16)
+print(d)

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/26D

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Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/2FBF9

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+<</P 17 0 R/S/Document/Type/StructElem/K[ 22 0 R 25 0 R 28 0 R 29 0 R 32 0 R 33 0 R 34 0 R 35 0 R] >>
+<</Type/StructTreeRoot/RoleMap 18 0 R/ParentTree 19 0 R/K[ 21 0 R] /ParentTreeNextKey 1>>
+<</Footnote/Note/Endnote/Note/Textbox/Sect/Header/Sect/Footer/Sect/InlineShape/Sect/Annotation/Sect/Artifact/Sect/Workbook/Document/Worksheet/Part/Macrosheet/Part/Chartsheet/Part/Dialogsheet/Part/Slide/Part/Chart/Sect/Diagram/Figure>>
+<</Nums[ 0 23 0 R] >>
+<</Names[] >>
+[ 31 0 R 30 0 R 32 0 R 22 0 R 33 0 R 34 0 R 35 0 R 26 0 R 27 0 R 28 0 R] 

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/39A25/Santa.txt

@@ -0,0 +1,19 @@
+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.
+
+
+
+Where is the team headed to?
+
+STTYN YATLOEP DNEA ONBL TGNTO MHEHH EISTIARIB FHSRA LD IIONA NL HERUV LN17-PTAA-RTON-RDOE-MCTN-AHCO
+XXXXX XXXXXXX XXXX XXXX XXXXX XXXXX XXXXXXXXX XXXXX XX XXXXX XX XXXXX HV18-XXXX-XXXX-XXXX-XXXX-XXXX
+DDPVCCDB
+
+L -> H
+N -> V

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/39A25/decode.py

@@ -0,0 +1,79 @@
+#!/usr/bin/python
+
+import subprocess
+import math
+import hashlib
+import base64
+from itertools import chain, product
+from zipfile import ZipFile
+
+# for x in ["Dasher", "Dancer", "Prancer", "Vixen", "Comet", "Cupid", "Donder", "Blitzen"]:
+#     subprocess.call(["unzip", "-P", x, "z.zip"])
+
+
+# print(bytes(int(x) for x in "5 8 16 20 27".split(" ")).decode("cp500"))
+
+# x = [chr(i + ord('a')) for i in range(0, 26)] + [chr(i + ord('A')) for i in range(0, 26)] + [str(i) for i in range(10)]
+# print(x)
+#
+# try:
+#     for s in x:
+#         data = ZipFile.open("Final_easy.zip", mode='r', pwd=s)
+#         if data != '':
+#             print("found pw")
+# except:
+#     pass
+
+
+# we know that b * c = 6497 and b < c
+prod = 6497
+for b in range(2,math.floor(math.sqrt(prod))):
+    if math.floor(prod / b) == prod / b:
+        c = prod // b
+        break
+
+# which gives us:
+# b = 73
+# c = 89
+# print("b=%d c=%d" % (b, c))
+
+hash = "CF945B5A36D1D3E68FFF78829CC8DBF6".lower()
+hash_reversed = "H0b0"
+
+def bruteforce(charset, minlength, maxlength):
+    return (''.join(candidate)
+        for candidate in chain.from_iterable(product(charset, repeat=i)
+        for i in range(1, maxlength + 1)))
+
+# alphabet = 'abcdefghiklmnopqrstuvwxyz'
+# alphabet += alphabet.upper()
+# alphabet += ''.join([str(i) for i in range(10)])
+#
+# for i in bruteforce(alphabet, 4, 4):
+#     try:
+#         m = hashlib.md5()
+#         m.update(i.encode("utf-8"))
+#         new_hash = m.hexdigest()
+#         if new_hash == hash:
+#             hash_reversed = i
+#             break
+#     except:
+#         pass
+
+if hash_reversed == None:
+    exit("could not find hash")
+
+# Step 3: squareRoot
+squareRoot = int(math.sqrt(8814961))
+
+# Step 4: XOR
+result = 'zvru'
+part3 = ''.join([chr(ord(result[i]) ^ ord(str(squareRoot)[i])) for i in range(4)])
+# print(part3)
+
+# Step 5: Base64
+b64 = base64.b64decode('RjBtMA==').decode("utf-8")
+# print(b64)
+
+flag = "HV18-%02d%02d-%s-%s-%04d-%s" % (b, c, hash_reversed, part3, squareRoot, b64)
+print(flag)

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/39A25/teaser.pls

@@ -0,0 +1,30 @@
+CREATE OR REPLACE FUNCTION checkHV18teaser wrapped 
+a000000
+b2
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+abcd
+8
+37f 22f
+9bGsDUl+WXOiRvCg6f+CmODMp3UwgwIJ+txqfC9Dgz+VaPwOTWaoKj5jW2QUCQapzabE52vy
+50h+W7xBf1NE2/Fa93pBwUJtOxLvz1WIU75VaGjqH5M6oL4/aHovVUteU3Arw0eLvVRDEvbd
+0mLqbyd4kEtMnI76J3vuLaHC1mkYuwEN6bdmd3GQPBtHV4fWHr5OM5B81yX+kw0560LKdDx8
+mVHJvc7y7vShjsCpFgEUd6sfN3ZbOkjjbg+AJSGuIjZzvT7vkQwM5wcQL73C6+BCiaaEG2ja
+r+3zqCSk6QzcKvIwuBwXf9UHGL4YS47JO3EOmIPOy8VQYfY1M9g6UeieqOftVm/Pr8smR11r
+UWM8kk1WTmMvY13s1Klpr7tFnzwjmnSnTP9Exz/dV5+cU3mlgyjqkAIsWnGqDGKMfVahOHSc
+Bzalmd+HDxxBF39ymrsGHfBUv0gAPtnYVCVWiG0Q9ij5DbBffRrsx4uOYuAqJ4KwT5vNpKon
+MSMAM3ZsIFVQgfnY/sfkB+jfGEuldGYiui7zvIMSHVDfPEE=
+
+/

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/39A25/teaser_unwrapped.tls

@@ -0,0 +1,39 @@
+FUNCTION checkHV18teaser(FLAG VARCHAR2) RETURN NUMBER IS
+	A VARCHAR2(4);
+	B NUMBER(10);
+	C NUMBER(10);
+	H VARCHAR(40);
+BEGIN
+	A := SUBSTR(FLAG,1,4);
+	IF NOT (A = 'HV18') THEN
+		RETURN 0;
+	END IF;
+
+	B := TO_NUMBER(SUBSTR(FLAG,6,2));
+	C := TO_NUMBER(SUBSTR(FLAG,8,2));
+	IF NOT (((B * C) = 6497) AND (B < C)) THEN
+		RETURN 0;
+	END IF;
+
+	A := SUBSTR(FLAG,11,4);
+	SELECT STANDARD_HASH(A, 'MD5') INTO H FROM DUAL;
+	IF NOT (H = 'CF945B5A36D1D3E68FFF78829CC8DBF6') THEN
+		RETURN 0;
+	END IF;
+
+	IF NOT ((UTL_RAW.CAST_TO_VARCHAR2(
+            UTL_RAW.BIT_XOR (
+              UTL_RAW.CAST_TO_RAW(SUBSTR(FLAG,16,4)),
+              UTL_RAW.CAST_TO_RAW(SUBSTR(FLAG,21,4)))
+           ) = 'zvru') AND
+          (TO_NUMBER(SUBSTR(FLAG,21,4)) = SQRT(8814961))) THEN
+		RETURN 0;
+	END IF;
+
+	IF NOT ( UTL_RAW.CAST_TO_VARCHAR2(UTL_ENCODE.BASE64_ENCODE(UTL_RAW.CAST_TO_RAW(SUBSTR(FLAG,26,4)))) = 'RjBtMA==') THEN
+		RETURN 0;
+	END IF;
+
+	DBMS_OUTPUT.PUT_LINE(A);
+	RETURN 1;
+END;

Teaser/decode.py

@@ -33,15 +33,18 @@ pix = im.load()
 size = im.size
 
 # Count Pixel types
-pixels = []
+pixels = {}
 for x in range(size[0]):
     for y in range(size[1]):
 
         p = pix[x,y]
         if p not in pixels:
-            pixels.append(p)
+            pixels[p] = 1
+        else:
+            pixels[p] += 1
 
-print(pixels)
+for p in pixels:
+    print(p, pixels[p])
 
 # Filter
 # for p in pixels: