Fixed overblown DDH claim

Author: JanBobolz

getting-started/protocols-tutorial.ipynb

@@ -14,7 +14,7 @@
     "$$\\mathrm{PRF}_k(x) = H_2(h, x, H_1(x)^k)$$ \n",
     "where $H_1:\\{0,1\\}^*\\rightarrow \\mathbb{G}$, $H_2:\\{0,1\\}^* \\rightarrow \\{0,1\\}^n$ are hash functions modeled as random oracles.\n",
     "\n",
-    "This is a PRF because under appropriate (DDH-type) assumptions (essentially the only way to distinguish a PRF-value $\\mathrm{PRF}_k(x)$ from random is to compute $H_1(x)^k$ without knowing $k$).\n",
+    "This is a PRF because under appropriate (Diffie-Hellman-type) assumptions (essentially the only way to distinguish a PRF-value $\\mathrm{PRF}_k(x)$ from random is to compute $H_1(x)^k$ without knowing $k$).\n",
     "\n",
     "## 🥸 How to obliviously retrieve function values\n",
     "\n",