Update MMSearch-Plus dataset with encrypted text fields (images unchanged)

README.md

@@ -69,7 +69,7 @@ Official repository for the paper "[MMSearch-Plus: Benchmarking Provenance-Aware
 
 ## Usage
 
-**⚠️ Important: This dataset is encrypted to prevent data contamination. However, decryption is handled transparently by the dataset loader.**
+**⚠️ Important: Text fields in this dataset are encrypted to prevent data contamination. Images are NOT encrypted and remain accessible. Decryption of text is handled transparently by the dataset loader.**
 
 ### Dataset Usage
 
@@ -79,7 +79,7 @@ Load the dataset with automatic decryption using your canary string:
 import os
 from datasets import load_dataset
 
-# Set the canary string (hint: it's the name of this repo)
+# Set the canary string (hint: it's the name of this repo without username)
 os.environ['MMSEARCH_PLUS'] = 'your_canary_string'
 
 # Load dataset with transparent decryption

mmsearch_plus.py

@@ -1,12 +1,14 @@
-"""MMSearch-Plus dataset with transparent decryption."""
+"""MMSearch-Plus dataset with transparent decryption.
+
+Note: Only text fields (question, answer, video_url, arxiv_id) are encrypted.
+Images are NOT encrypted and remain as PIL Image objects for accessibility.
+"""
 
 import base64
 import hashlib
-import io
 import os
 from typing import Dict, Any, List
 import datasets
-from PIL import Image
 
 _CITATION = """\
 @article{tao2025mmsearch,
@@ -41,23 +43,6 @@ def derive_key(password: str, length: int) -> bytes:
     key = hasher.digest()
     return key * (length // len(key)) + key[: length % len(key)]
 
-def decrypt_image(ciphertext_b64: str, password: str) -> Image.Image:
-    """Decrypt base64-encoded encrypted image bytes back to PIL Image."""
-    if not ciphertext_b64:
-        return None
-
-    try:
-        encrypted = base64.b64decode(ciphertext_b64)
-        key = derive_key(password, len(encrypted))
-        decrypted = bytes([a ^ b for a, b in zip(encrypted, key)])
-
-        # Convert bytes back to PIL Image
-        img_buffer = io.BytesIO(decrypted)
-        image = Image.open(img_buffer)
-        return image
-    except Exception:
-        return None
-
 def decrypt_text(ciphertext_b64: str, password: str) -> str:
     """Decrypt base64-encoded ciphertext using XOR cipher with derived key."""
     if not ciphertext_b64: