add poster generator for 2010 NMT event

doc/2010-10-NMT/posters/descavenge.py

@@ -0,0 +1,14 @@
+#! /usr/bin/python3
+
+import binascii
+import sys
+
+def mask(buf1, buf2):
+    return bytes(a^b for (a,b) in zip(buf1, buf2))
+
+t = bytes([0]*29)
+for line in sys.stdin:
+    line = line.strip().encode()
+    a = binascii.unhexlify(line)
+    t = mask(t, a)
+print(t)

doc/2010-10-NMT/posters/scavenger.py

@@ -0,0 +1,21 @@
+#! /usr/bin/python3
+
+import random
+import binascii
+
+def mask(buf1, buf2):
+    return bytes(a^b for (a,b) in zip(buf1, buf2))
+
+ptext = b"xecip-nvkop-zogyr-manef-voxyx"
+
+pads = [b"Good job figuring out the hex",
+        b"encoding, but there's more to",
+        b"it!  Bring your result to the",
+        b"contest for points!          "]
+
+t = ptext
+for p in pads:
+    print(binascii.hexlify(p).decode())
+    t = mask(p, t)
+
+print(binascii.hexlify(t).decode())