Update solution.md

Author: shellfarmer

tamuctf2018/readyXORnot/solution.md

@@ -1 +1,17 @@
 ### readyXORnot
+
+original data: "El Psy Congroo"
+encrypted data: "IFhiPhZNYi0KWiUcCls="
+encrypted flag: "I3gDKVh1Lh4EVyMDBFo="
+
+
+Simple XOR known text attack
+
+```
+➜  ~ python             
+>>> import pwn
+>>> pwn.xor(pwn.b64d('IFhiPhZNYi0KWiUcCls='), 'El Psy Congroo')
+'e4Bne4Bne4Bne4'
+>>> pwn.xor(pwn.b64d('I3gDKVh1Lh4EVyMDBFo='), 'e4Bne4Bne4Bne4')
+'FLAG=Alpacaman'
+```