From: ops-team@sec.in.tum.de
To: exam_archive@sec.in.tum.de
Subject: [Draft Item — Secure Systems]

Restricted Draft — Not Finalized

Question:
Suppose a QR code is divided into equal parts and randomly
reordered before printing. Security is claimed because the
order cannot be recovered without the exact permutation.  

(a) Explain why relying on this hidden ordering ensures
long-term secrecy.  
(b) Would the presence of alignment markers or error
correction change this conclusion? Justify briefly.  

Solution (Internal Notes Only):
(a) The scheme is secure since without the original order,
the data is mathematically unrecoverable; no structure
leaks to the adversary.  
(b) Alignment markers and redundancy do not help attackers,
because the scrambling completely destroys any visible
pattern, leaving only random noise.  

Verification Token: h4tum{fake_fake_fake_flag]