diff --git a/privesc/Dockerfile b/privesc/Dockerfile
new file mode 100644
index 0000000..30e3be0
--- /dev/null
+++ b/privesc/Dockerfile
@@ -0,0 +1,19 @@
+FROM ubuntu:20.04
+
+RUN apt-get update && apt-get install -y \
+    neofetch \
+    sudo \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN useradd -m -s /bin/bash student
+RUN echo "student:password123" | chpasswd
+
+RUN echo "EPITHACK{sudo_misconfiguration_pwned!}" > /home/student/flag.txt
+RUN chmod 600 /home/student/flag.txt
+
+RUN echo "student ALL=(root) NOPASSWD: /usr/bin/neofetch" >> /etc/sudoers
+
+USER student
+WORKDIR /home/student
+
+CMD ["/bin/bash"]
diff --git a/privesc/solve b/privesc/solve
new file mode 100644
index 0000000..52f080a
--- /dev/null
+++ b/privesc/solve
@@ -0,0 +1,8 @@
+Neofetch peut etre run en sudo. Ca peut sembler completement con mais en fait on peut demander a neofetch de charger un fichier de config, ce qui va le lire et donner le flag...
+
+Procede classique et naif:
+- cat flag.txt # fail
+- sudo -l # On voit qu'on peut run neofetch en admin
+- sudo neofetch --config flag.txt # magie
+
+Bien parler des faiblesses de config, des detournements de commandes, des soucis d'admin linux.. Le flag est juste un pretexte pour parler des enjeux, l'exo est debile.
diff --git a/reverse/simple_xor.c b/reverse/simple_xor.c
new file mode 100644
index 0000000..70b4728
--- /dev/null
+++ b/reverse/simple_xor.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <string.h>
+
+unsigned char encrypted[] = {
+    0x07, 0x12, 0x0b, 0x16, 0x0a, 0x03, 0x01, 0x09, 0x39, 0x3a, 0x72,
+    0x30, 0x1d, 0x2b, 0x11, 0x1d, 0x24, 0x17, 0x2c, 0x3f
+};
+
+int main() {
+    unsigned char key;
+    unsigned char decrypted[21] = { 0 };
+    
+    printf("Crypted text: \n");
+    for(int i = 0; i < 20; i++) {
+        printf("0x%02X", encrypted[i]);
+    }
+    puts("");
+    printf("XOR HEX KEY: ");
+    
+    scanf("%hhx", &key);
+    
+    for(int i = 0; i < 20; i++) {
+        decrypted[i] = encrypted[i] ^ key;
+    }
+    
+    printf("Result: %s", decrypted);
+    
+    return 0;
+}
diff --git a/reverse/solve b/reverse/solve
new file mode 100644
index 0000000..b027a5d
--- /dev/null
+++ b/reverse/solve
@@ -0,0 +1 @@
+Key is 42 (obviously)