diff --git a/README.md b/README.md
index eba64a6..7a976bf 100644
--- a/README.md
+++ b/README.md
@@ -174,7 +174,7 @@ There are following zero-dependency algorithms:
 - [abstract/weierstrass: Short Weierstrass curve](#abstractweierstrass-short-weierstrass-curve)
 - [abstract/edwards: Twisted Edwards curve](#abstractedwards-twisted-edwards-curve)
 - [abstract/montgomery: Montgomery curve](#abstractmontgomery-montgomery-curve)
-- [abstract/bls: BLS curves](#abstractbls-bls-curves)
+- [abstract/bls: Barreto-Lynn-Scott curves](#abstractbls-barreto-lynn-scott-curves)
 - [abstract/hash-to-curve: Hashing strings to curve points](#abstracthash-to-curve-hashing-strings-to-curve-points)
 - [abstract/poseidon: Poseidon hash](#abstractposeidon-poseidon-hash)
 - [abstract/modular: Modular arithmetics utilities](#abstractmodular-modular-arithmetics-utilities)
@@ -452,7 +452,7 @@ Proper Elliptic Curve Points are not implemented yet.
 
 You must specify curve params `Fp`, `a`, `Gu` coordinate of u, `montgomeryBits` and `nByteLength`.
 
-### abstract/bls: BLS curves
+### abstract/bls: Barreto-Lynn-Scott curves
 
 The module abstracts BLS (Barreto-Lynn-Scott) pairing-friendly elliptic curve construction.
 They allow to construct [zk-SNARKs](https://z.cash/technology/zksnarks/) and
diff --git a/test/ed448.test.js b/test/ed448.test.js
index c96c07e..42406a9 100644
--- a/test/ed448.test.js
+++ b/test/ed448.test.js
@@ -566,22 +566,34 @@ describe('ed448', () => {
   });
 
   should('not verify when sig.s >= CURVE.n', () => {
-    const privateKey = ed448.utils.randomPrivateKey();
-    const message = Uint8Array.from([0xab, 0xbc, 0xcd, 0xde]);
-    const publicKey = ed448.getPublicKey(privateKey);
-    const signature = ed448.sign(message, privateKey);
-
-    const R = signature.slice(0, 56);
-    let s = signature.slice(56, 112);
-
-    s = bytesToHex(s.slice().reverse());
-    s = BigInt('0x' + s);
-    s = s + ed448.CURVE.n;
-    s = numberToBytesLE(s, 56);
-
-    const sig_invalid = concatBytes(R, s);
+    function get56bSig() {
+      const privateKey = ed448.utils.randomPrivateKey();
+      const message = Uint8Array.from([0xab, 0xbc, 0xcd, 0xde]);
+      const publicKey = ed448.getPublicKey(privateKey);
+      const signature = ed448.sign(message, privateKey);
+  
+      const R = signature.slice(0, 56);
+      let s = signature.slice(56, 112);
+  
+      s = bytesToHex(s.slice().reverse());
+      s = BigInt('0x' + s);
+      s = s + ed448.CURVE.n;
+      s = numberToBytesLE(s, 56);
+  
+      const sig_invalid = concatBytes(R, s);
+      return { sig_invalid, message, publicKey };
+    }
+    let sig;
+    while (true) {
+      try { 
+        sig = get56bSig();
+        break;
+      } catch (error) {
+        // non-56b sig was generated, try again
+      }
+    }
     throws(() => {
-      ed448.verify(sig_invalid, message, publicKey);
+      ed448.verify(sig.sig_invalid, sig.message, sig.publicKey);
     });
   });