diff --git a/strobe/www/specs/index.html b/strobe/www/specs/index.html
index e4a6267..c13f5c9 100644
--- a/strobe/www/specs/index.html
+++ b/strobe/www/specs/index.html
@@ -114,7 +114,7 @@
 
     <p class="comment">
         <span class="sc">Strobe</span>-128/1600 and <span class="sc">Strobe</span>-256/1600
-        are based on the <a href="http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-185.pdf">
+        are based on the <a href="https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-185.pdf">
         cSHAKE specification</a> from NIST.
     </p>
         
@@ -211,7 +211,7 @@
     </span>
     <span class="comment">
         This format is chosen for compatibility with
-            <a href="http://csrc.nist.gov/publications/drafts/800-185/sp800_185_draft.pdf">cSHAKE</a>.
+            <a href="https://csrc.nist.gov/publications/drafts/800-185/sp800_185_draft.pdf">cSHAKE</a>.
         The description of the initial state involves multiple calls to <var>F</var>
         if <var>R</var> is less than 15 bytes,
         but this isn't the case for any of the recommended instances.  The
@@ -1055,4 +1055,4 @@ def PRF(<var class="self">self</var>, <var>length</var>, <var>more</var>=False):
 def RATCHET(<var class="self">self</var>, <var>length</var>, <var>more</var>=False):
     <var>self</var>.operate(C, <var>length</var>, <var>more</var>)    
 </pre>
-</body>
\ No newline at end of file
+</body>