From 72146ead2933c74d52df160d7bf999eab3459a7b Mon Sep 17 00:00:00 2001
From: Christopher Talib <christopher.talib@dcso.de>
Date: Wed, 8 May 2019 17:51:57 +0200
Subject: [PATCH] Adding Ceasar and Vigenere easy challenge + starting to work
 on tutorials

---
 challenges/chapter_1/stega/ceasar.md          |  5 ++++
 challenges/chapter_1/stega/ceasar_solution.md |  1 +
 challenges/chapter_1/stega/vigenere.md        |  5 ++++
 .../chapter_1/stega/vigenere_solution.md      |  1 +
 tutorials/browser.md                          |  0
 tutorials/command_line.md                     | 26 +++++++++++++++++++
 tutorials/cryptography.md                     |  0
 tutorials/programming.md                      |  0
 8 files changed, 38 insertions(+)
 create mode 100644 challenges/chapter_1/stega/ceasar.md
 create mode 100644 challenges/chapter_1/stega/ceasar_solution.md
 create mode 100644 challenges/chapter_1/stega/vigenere.md
 create mode 100644 challenges/chapter_1/stega/vigenere_solution.md
 create mode 100644 tutorials/browser.md
 create mode 100644 tutorials/command_line.md
 create mode 100644 tutorials/cryptography.md
 create mode 100644 tutorials/programming.md

diff --git a/challenges/chapter_1/stega/ceasar.md b/challenges/chapter_1/stega/ceasar.md
new file mode 100644
index 0000000..c94ac9c
--- /dev/null
+++ b/challenges/chapter_1/stega/ceasar.md
@@ -0,0 +1,5 @@
+# Ceasar
+
+Description: Julius Ceasar was a smart man.
+
+Lq fubswrjudskb, d Fdhvdu flskhu, lv rqh ri wkh vlpsohvw dqg prvw zlghob nqrzq hqfubswlrq whfkqltxhv. Lw lv d wbsh ri vxevwlwxwlrq flskhu lq zklfk hdfk ohwwhu lq wkh sodlqwhaw lv uhsodfhg eb d ohwwhu vrph ilahg qxpehu ri srvlwlrqv grzq wkh doskdehw. Iru hadpsoh, zlwk d ohiw vkliw ri 3, G zrxog eh uhsodfhg eb D, H zrxog ehfrph E, dqg vr rq. Wkh phwkrg lv qdphg diwhu Mxolxv Fdhvdu, zkr xvhg lw lq klv sulydwh fruuhvsrqghqfh. Eb wkh zdb, khuh lv brxu iodj: {iodj_DyhFhdvdu}
\ No newline at end of file
diff --git a/challenges/chapter_1/stega/ceasar_solution.md b/challenges/chapter_1/stega/ceasar_solution.md
new file mode 100644
index 0000000..0410a8a
--- /dev/null
+++ b/challenges/chapter_1/stega/ceasar_solution.md
@@ -0,0 +1 @@
+{flag_AveCeasar}
\ No newline at end of file
diff --git a/challenges/chapter_1/stega/vigenere.md b/challenges/chapter_1/stega/vigenere.md
new file mode 100644
index 0000000..a16c9b6
--- /dev/null
+++ b/challenges/chapter_1/stega/vigenere.md
@@ -0,0 +1,5 @@
+# Vigenere
+
+Description: Ceasar is too easy, things should be more complicated.
+
+Gwxiz mgwpu jsysi wdb gqrx, tsiakggikym ijmcmjgdvm iymk, wzl js rmlwhwj xrqgsm qtgvhzhpvz yg prfjzk ig hfpjzk qnkee vtouhe. {wpvo_KrpvptoqurVwTsjt}
\ No newline at end of file
diff --git a/challenges/chapter_1/stega/vigenere_solution.md b/challenges/chapter_1/stega/vigenere_solution.md
new file mode 100644
index 0000000..d970d27
--- /dev/null
+++ b/challenges/chapter_1/stega/vigenere_solution.md
@@ -0,0 +1 @@
+{flag_EncryptionIsCool}
\ No newline at end of file
diff --git a/tutorials/browser.md b/tutorials/browser.md
new file mode 100644
index 0000000..e69de29
diff --git a/tutorials/command_line.md b/tutorials/command_line.md
new file mode 100644
index 0000000..5c334e4
--- /dev/null
+++ b/tutorials/command_line.md
@@ -0,0 +1,26 @@
+# Introduction
+
+The command line interface is run in a terminal (or prompt). It is the direct interface with your computer. There you are able to do the same things are you are able in a graphic interface such as visiting a folder, reading and writing files.
+
+But the command line interface allows you access to a number of other programs which are really useful in a developer's every day life or while participating in CTFs. You should not be an expert, but with little knowledge of the command line you will already be able to do a number of things faster and quicker.
+
+Terminals in Linux and OSX are quite similar, if you run Windows, things are a bit different.
+
+## Understanding paths
+
+TODO
+
+## Basic command line 
+
+* List the files in the current folder: `ls`
+* See where you are: `pwd`
+* See who you are: `whoami`
+* Go in a folder: `cd INSERT_HERE_THE_NAME_OF_YOUR_FOLDER`
+* Go in the parent folder: `cd ..`
+* Go to your home directory: `cd ~` or `cd`
+* Print a file in the terminal: `cat THE_NAME_OF_YOUR_FILE`
+* Copy a file: `cp YOUR_FILE YOUR_DESTINATION`
+
+## Run programs in command line
+
+TODO
\ No newline at end of file
diff --git a/tutorials/cryptography.md b/tutorials/cryptography.md
new file mode 100644
index 0000000..e69de29
diff --git a/tutorials/programming.md b/tutorials/programming.md
new file mode 100644
index 0000000..e69de29