commit c9764c3f185acf93e22ec0ae255c4151b1d4c217
Author: Maxime Vorwerk <Maxime Vorwerk>
Date:   Wed Jun 5 15:28:09 2024 +0200

    3 first challenges

diff --git a/mod_26/flag b/mod_26/flag
new file mode 100644
index 0000000..d35e40f
--- /dev/null
+++ b/mod_26/flag
@@ -0,0 +1 @@
+cvpbPGS{arkg_gvzr_V'yy_gel_2_ebhaqf_bs_ebg13_hyLicInt}
diff --git a/mod_26/sol.py b/mod_26/sol.py
new file mode 100755
index 0000000..732c347
--- /dev/null
+++ b/mod_26/sol.py
@@ -0,0 +1,19 @@
+#!/usr/bin/python
+
+def rot13(char):
+    c = ord(char)
+    A = ord('A')
+    Z = ord('Z')
+    a = ord('a')
+    z = ord('z')
+    if c >= A and c <= Z:
+        char = chr((c-A+13)%(Z-A+1)+A)
+    elif c >= a and c <= z:
+        char = chr((c-a+13)%(z-a+1)+a)
+    print(char, end='')
+
+with open("flag", "r") as f:
+    flag = f.read()
+    for char in flag:
+        rot13(char)
+
diff --git a/obedient_cat/flag b/obedient_cat/flag
new file mode 100755
index 0000000..7f225d7
--- /dev/null
+++ b/obedient_cat/flag
@@ -0,0 +1 @@
+picoCTF{s4n1ty_v3r1f13d_2fd6ed29}
diff --git a/python_wrangling/ende.py b/python_wrangling/ende.py
new file mode 100755
index 0000000..6cd4565
--- /dev/null
+++ b/python_wrangling/ende.py
@@ -0,0 +1,61 @@
+#!/usr/bin/python
+
+import sys
+import base64
+from cryptography.fernet import Fernet
+
+
+
+usage_msg = "Usage: "+ sys.argv[0] +" (-e/-d) [file]"
+help_msg = usage_msg + "\n" +\
+        "Examples:\n" +\
+        "  To decrypt a file named 'pole.txt', do: " +\
+        "'$ python "+ sys.argv[0] +" -d pole.txt'\n"
+
+
+
+if len(sys.argv) < 2 or len(sys.argv) > 4:
+    print(usage_msg)
+    sys.exit(1)
+
+
+
+if sys.argv[1] == "-e":
+    if len(sys.argv) < 4:
+        sim_sala_bim = input("Please enter the password:")
+    else:
+        sim_sala_bim = sys.argv[3]
+
+    ssb_b64 = base64.b64encode(sim_sala_bim.encode())
+    c = Fernet(ssb_b64)
+
+    with open(sys.argv[2], "rb") as f:
+        data = f.read()
+        data_c = c.encrypt(data)
+        sys.stdout.write(data_c.decode())
+
+
+elif sys.argv[1] == "-d":
+    if len(sys.argv) < 4:
+        sim_sala_bim = input("Please enter the password:")
+    else:
+        sim_sala_bim = sys.argv[3]
+
+    ssb_b64 = base64.b64encode(sim_sala_bim.encode())
+    c = Fernet(ssb_b64)
+
+    with open(sys.argv[2], "r") as f:
+        data = f.read()
+        data_c = c.decrypt(data.encode())
+        sys.stdout.buffer.write(data_c)
+
+
+elif sys.argv[1] == "-h" or sys.argv[1] == "--help":
+    print(help_msg)
+    sys.exit(1)
+
+
+else:
+    print("Unrecognized first argument: "+ sys.argv[1])
+    print("Please use '-e', '-d', or '-h'.")
+
diff --git a/python_wrangling/flag.txt.en b/python_wrangling/flag.txt.en
new file mode 100755
index 0000000..271a96d
--- /dev/null
+++ b/python_wrangling/flag.txt.en
@@ -0,0 +1 @@
+gAAAAABgUAIWIvSiR0W23DAHIK5DX6Y4BvwES94M_XdDcNAquhp-A0D2z8n812YEXaSD9WhoweBh2cm5Wa0cqzuW0Kc7fOct0OJnpOmVF8A91j0Hx4dKtvk3l5ghPT71Y7GxErPRyJUs
\ No newline at end of file
diff --git a/python_wrangling/out b/python_wrangling/out
new file mode 100644
index 0000000..69afa86
--- /dev/null
+++ b/python_wrangling/out
@@ -0,0 +1,2 @@
+Please enter the password:
+picoCTF{4p0110_1n_7h3_h0us3_ac9bd0ff}
diff --git a/python_wrangling/pw.txt b/python_wrangling/pw.txt
new file mode 100755
index 0000000..c3a0824
--- /dev/null
+++ b/python_wrangling/pw.txt
@@ -0,0 +1 @@
+ac9bd0ffac9bd0ffac9bd0ffac9bd0ff