diff --git a/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption-metadata.mp4 b/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption-metadata.mp4
index 8fff861..9aa56a2 100644
Binary files a/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption-metadata.mp4 and b/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption-metadata.mp4 differ
diff --git a/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption.pdf b/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption.pdf
index 2a01af4..69273b6 100644
Binary files a/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption.pdf and b/teaching/2024_2025_-_Crypto_eng/crypto_eng_02_symmetric_encryption.pdf differ
diff --git a/teaching/2024_2025_-_Crypto_eng/index.html b/teaching/2024_2025_-_Crypto_eng/index.html
index 485c44c..2e4ad63 100644
--- a/teaching/2024_2025_-_Crypto_eng/index.html
+++ b/teaching/2024_2025_-_Crypto_eng/index.html
@@ -84,6 +84,7 @@ <h2 id="td">TD</h2>
 <ul>
 <li>TD 1: <a href="./crypto_eng_td_01.pdf">Proof methods and OT/PRF/PRG</a></li>
 <li>TD 2: <a href="./crypto_eng_td_02.pdf">IND-CPA security</a></li>
+<li>TD 3: <a href="./crypto_eng_td_02.pdf">Hash functions</a></li>
 </ul>
           
         </div>