diff --git a/schema/cryptography-defs.json b/schema/cryptography-defs.json
index 2d1a7f19..c4e13559 100644
--- a/schema/cryptography-defs.json
+++ b/schema/cryptography-defs.json
@@ -1538,13 +1538,13 @@
       "standard": [
         {
           "name": "SipHash Spec",
-          "url": "https://131002.net/siphash/"
+          "url": "https://doi.org/10.1007/978-3-642-34931-7_28"
         }
       ],
       "variant": [
         {
           "pattern": "SipHash[-{compressionRounds}-{finalizationRounds}]",
-          "primitive": "hash"
+          "primitive": "mac"
         }
       ]
     },