Added writeup for classic-crypto of ekoparty-pre-ctf-2015

Author: chaitan94

ekoparty-pre-ctf-2015/crypto/classic-crypto/chaitan94/README.md

@@ -0,0 +1,54 @@
+[](ctf=ekoparty-2015)
+[](type=crypto)
+[](tags=morse,ceasar)
+[](tools=audacity)
+[](techniques=)
+
+# Classic Crypto (crypto-50)
+
+We are given an [audio file](../message.mp3). Let's open it up in [Audacity](http://audacityteam.org/)
+
+![Screenshot of given audio file in Audacity](screenshot.png)
+
+Looks like morse code. Let's write it down:
+```
+.-. -..- -...  --.. -... . ..-. .-. .--. -... --.- .-. .--. -. .-. ..-. -. .
+```
+Tried out an [online morse code decoder](http://morsecode.scphillips.com/translator.html) and got:
+```
+RXBZBEFRPBQRPNRFNE
+```
+Looks like we need to something more, maybe ceasar?
+
+Let's print out all 26 shifts:
+```
+lrvtvyzljvkljhlzhy
+mswuwzamkwlmkimaiz
+ntxvxabnlxmnljnbja
+ouywybcomynomkockb
+pvzxzcdpnzopnlpdlc
+qwayadeqoapqomqemd
+rxbzbefrpbqrpnrfne
+sycacfgsqcrsqosgof
+tzdbdghtrdstrpthpg
+uaecehiusetusquiqh
+vbfdfijvtfuvtrvjri
+wcgegjkwugvwuswksj
+xdhfhklxvhwxvtxltk
+yeigilmywixywuymul
+zfjhjmnzxjyzxvznvm
+agkiknoaykzaywaown
+bhljlopbzlabzxbpxo
+cimkmpqcambcaycqyp
+djnlnqrdbncdbzdrzq
+ekomorsecodecaesar
+flpnpstfdpefdbftbs
+gmqoqtugeqfgecguct
+hnrpruvhfrghfdhvdu
+iosqsvwigshigeiwev
+jptrtwxjhtijhfjxfw
+kqusuxykiujkigkygx
+```
+
+Aand there's the flag
+> EKO{MORSECODECAESAR}