diff --git a/js/test/CryptTool.js b/js/test/CryptTool.js
index c6244751..fa0cfca9 100644
--- a/js/test/CryptTool.js
+++ b/js/test/CryptTool.js
@@ -33,6 +33,39 @@ describe('CryptTool', function () {
             {tests: 3});
         });
 
+        it('can decrypt a particular message (#260)', function () {
+            var message = `
+1 subgoal
+
+inv : Assert
+expr : Expr
+sBody : Instr
+deduction : (|- [|inv /\ assertOfExpr expr|] sBody [|inv|])%assert
+IHdeduction : (|= [|inv /\ assertOfExpr expr |] sBody [|inv|])%assert
+mem : Mem
+preInMem : inv mem
+m : Mem
+n : nat
+interpRel : interp (nth_iterate sBody n) (MemElem mem) = CpoElem Mem m
+lastIter : interp (nth_iterate sBody n) (MemElem mem) |=e expr_neg expr
+notLastIter : forall p : nat,
+              p < n -> interp (nth_iterate sBody p) (MemElem mem) |=e expr
+isWhile : interp (while expr sBody) (MemElem mem) =
+          interp (nth_iterate sBody n) (MemElem mem)
+
+======================== ( 1 / 1 )
+conseq_or_bottom inv (interp (nth_iterate sBody n) (MemElem mem))
+
+`;
+            if (message !== $.PrivateBin.CryptTool.decipher(
+                'y+4So8y7GYliFc+LcyFhXYSyMW/v1CdGqnSND+MPtNw=',
+                '', // no password
+                '{"iv":"LwfPcuKXYo2f6gjrtVRbcg==","v":1,"iter":1000,"ks":256,"ts":128,"mode":"gcm","adata":"","cipher":"aes","salt":"gw7Pe+7WGGI=","ct":"Mk6jTCNQjJUTnOQtFGtNqxTtzwnbDEWNmPd0teSJn5PW2IczTcE5aSvevONSOEpP476aNUA0JfPuK8v8zLqK2rmk8ESmm9wqkEdWWdMY2kvzU8mxo1yp6DBs5aXmy9y585GvB4kaCyh6nH2YFDQczUDZ4AQlGC8T11YMPO4sHM\/SOewS8vCnZ3tTiSuLjV0LC6k+xZ3jTg\/yH+V2cH5vfvj2eQMhUaMOyzjSQF34Ab7+pApuVVHXZ\/0lo86btt7iWo7yOHV59Te9AjpxzWgBI2gzTBBsk\/4WeYYVK3l2lTLy08GS9D8D1AbSsTrp5tSH84StAr+kMnEIsiR6FIbJ\/AP+6v9MQ2ryyUXGOj5HQLUZDsle3QQvtB7F6mqPDUvKtx\/Pxx0OHgNW5ttA581Hn1XWreUF6KzoWfcA6XdDEH4eylNiFrAFX+H1Mxfnxwz3aVOiRlP4+zrtmNcR\/XV87nzuDz2fqScrjFsPQ+FV\/784qe\/ZYs3Kp0Q+kVAnXm31vVwc6GU0b\/1bTZfknts0fKoIjCcH1gLivQfrj87QlTUa4l6TVzqgLLapB4EgW4CxcZ4PBhyexSuw+ZmUw\/kqyXZWP3R\/IzElI5Lt9GyLIzpyI9EvWLpVTn8iN8XOFZuEhHfTGb7Wdl+\/\/la4gsvhEvAx+ADqjjPgX0h4lFbyMZXHU3yN0QJr1jiZhIdbWL0QEyUkuWk6PK6E0ziHu558+8+WEjeYkElPosZwKtCHE4Ogfk6taZJhcV3rQu8U\/icqd1gAzbBFXp0="}'
+            )) {
+                throw Error('a particular message (#260) could not be deciphered');
+            }
+        });
+
         // The below static unit tests are included to ensure deciphering of "classic"
         // SJCL based pastes still works
         it(