diff --git a/alpacahack/daily/useful-machine/dissassemble.py b/alpacahack/daily/useful-machine/dissassemble.py
new file mode 100644
--- /dev/null
+++ b/alpacahack/daily/useful-machine/dissassemble.py
@@ -0,0 +1,27 @@
+import sys
+
+filename = sys.argv[1]
+
+with open(filename, "rb") as f:
+    code = f.read()
+
+ops = {
+    0: "INPUT   ",
+    1: "MOV_IMM ",
+    2: "MOV_MEM ",
+    3: "ADD     ",
+    4: "MUL     ",
+    5: "XOR     ",
+    6: "NOT     "
+}
+
+for i in range(0, len(code), 3):
+    if i + 2 >= len(code):
+        break
+    op = code[i]
+    o1 = code[i+1]
+    o2 = code[i+2]
+
+    op_name = ops.get(op, f"UNKNOWN({op})")
+    print(f"{i:04x}: {op_name} mem[{o1:02x}], {
+          o2:02x} (mem[{o2:02x}] if mem op)")
diff --git a/alpacahack/daily/useful-machine/solve.py b/alpacahack/daily/useful-machine/solve.py
new file mode 100644
--- /dev/null
+++ b/alpacahack/daily/useful-machine/solve.py
@@ -0,0 +1,21 @@
+constants = [
+    (0x09, 0xb8), (0xda, 0x92), (0xf0, 0xd2), (0xda, 0xab), (0xc1, 0x87),
+    (0xee, 0xcc), (0xa9, 0xfa), (0xca, 0x7a), (0xba, 0xbf), (0xd0, 0x9b),
+    (0xc3, 0xe7), (0x89, 0xfe), (0x8d, 0x16), (0x80, 0x23), (0x80, 0x44),
+    (0x5a, 0xad), (0xa1, 0xeb), (0xc7, 0x42), (0x45, 0x9a), (0xf9, 0xc4),
+    (0xd2, 0x87), (0xa2, 0x83), (0xf2, 0xd2), (0x43, 0x39), (0x03, 0xcd),
+    (0x4f, 0x16), (0xc8, 0x6a), (0x5a, 0xaf), (0x98, 0xd6), (0x52, 0x3c),
+    (0xb7, 0x6c), (0xfd, 0xe4), (0xaa, 0x29), (0xe7, 0x23), (0xc6, 0x7d),
+    (0xe2, 0xf2), (0x84, 0x08), (0x70, 0xd3), (0x2b, 0x75), (0xeb, 0x1d)
+]
+
+flag = ""
+prev_p = 0
+
+for k1, k2 in constants:
+    curr_p = (-k2) % 256
+    char_code = ((curr_p ^ k1) - prev_p) % 256
+    flag += chr(char_code)
+    prev_p = curr_p
+
+print(flag)