diff --git a/README.md b/README.md
index 726364a..bf48598 100644
--- a/README.md
+++ b/README.md
@@ -93,9 +93,11 @@ docker compose up -d
 
    在该部署目录运行 `docker compose up -d --force-recreate backend`，使新环境变量进入后端容器。后端重建期间，面板 API 会短暂中断。容器恢复后重新加载前端页面；如果 PWA 提示“发现新版本”，选择“刷新”，也可以用新的无痕窗口核对是否仍加载旧页面。
 
-3. 用户照常用密码登录，桌面端点右上角“个人资料”，手机端点底部“我的”（均进入 `/profile`）；在页面顶部的“通行证密钥”卡片输入**当前密码**、可选名称，点击“绑定通行证密钥”并完成设备解锁。绑定或删除均需当前密码，且用户只能管理自己账号的密钥。
+3. 用户照常用密码登录，桌面端点右上角“个人资料”，手机端点底部“我的”（均进入 `/profile`）；在页面顶部的“通行证密钥”卡片输入**当前密码**、可选名称，点击“绑定通行证密钥”并完成设备解锁。新绑定要求设备支持可发现凭据（resident key），不支持的设备会在绑定时失败。绑定或删除均需当前密码，且用户只能管理自己账号的密钥。
 
-4. 以后在登录页输入用户名，点击“使用通行证密钥登录”并解锁设备。账号被停用时密钥登录也会被拒绝。撤销密钥仍到个人资料页输入当前密码并删除。
+4. 以后在登录页直接点击“选择通行证密钥登录”，由设备选择账号并解锁，**无需先填写用户名**。账号被停用时密钥登录也会被拒绝。撤销密钥仍到个人资料页输入当前密码并删除。
+
+   旧版本绑定时只“优先”请求可发现凭据，现有密钥是否能直接选账号取决于当时的设备，不能按绑定版本统一判定或批量删除。若设备不显示某把旧密钥，请使用密码登录，在个人资料页删除该密钥并重新绑定；确认新密钥与密码恢复途径可用后再清理其他旧密钥。登录页不提供用户名密钥回退。
 
 **入口未显示时，按顺序检查：**
 
diff --git a/go-backend/internal/http/handler/passkey.go b/go-backend/internal/http/handler/passkey.go
index 1d12ddf..16038ed 100644
--- a/go-backend/internal/http/handler/passkey.go
+++ b/go-backend/internal/http/handler/passkey.go
@@ -60,7 +60,7 @@ func passkeyConfig() (*webauthn.WebAuthn, string) {
 		RPID:                   host,
 		RPDisplayName:          "FLVX",
 		RPOrigins:              []string{origin},
-		AuthenticatorSelection: protocol.AuthenticatorSelection{UserVerification: protocol.VerificationRequired, ResidentKey: protocol.ResidentKeyRequirementPreferred},
+		AuthenticatorSelection: protocol.AuthenticatorSelection{UserVerification: protocol.VerificationRequired, ResidentKey: protocol.ResidentKeyRequirementRequired},
 		Timeouts: webauthn.TimeoutsConfig{
 			Login:        webauthn.TimeoutConfig{Enforce: true, Timeout: passkeyTTL},
 			Registration: webauthn.TimeoutConfig{Enforce: true, Timeout: passkeyTTL},
@@ -112,6 +112,17 @@ func (h *Handler) takePasskeyCeremony(id, kind, origin string, userID int64) (we
 	return c.session, true
 }
 
+func (h *Handler) takePasskeyLoginCeremony(id, origin string) (passkeyCeremony, bool) {
+	h.passkeyMu.Lock()
+	c, ok := h.passkeyPending[id]
+	delete(h.passkeyPending, id)
+	h.passkeyMu.Unlock()
+	if !ok || c.kind != "login-discoverable" || c.origin != origin || time.Now().After(c.session.Expires) {
+		return passkeyCeremony{}, false
+	}
+	return c, true
+}
+
 func (h *Handler) loadPasskeyUser(userID int64) (passkeyUser, error) {
 	user, err := h.repo.GetUserByID(userID)
 	if err != nil || user == nil || user.Status != 1 {
@@ -178,7 +189,7 @@ func (h *Handler) passkeyRegisterBegin(w http.ResponseWriter, r *http.Request) {
 		response.WriteJSON(w, response.ErrDefault("无法读取通行证密钥"))
 		return
 	}
-	options, session, err := wa.BeginRegistration(u)
+	options, session, err := wa.BeginRegistration(u, webauthn.WithResidentKeyRequirement(protocol.ResidentKeyRequirementRequired))
 	if err != nil {
 		response.WriteJSON(w, response.ErrDefault("无法创建通行证密钥挑战"))
 		return
@@ -278,26 +289,16 @@ func (h *Handler) passkeyLoginBegin(w http.ResponseWriter, r *http.Request) {
 	var req struct {
 		Username string `json:"username"`
 	}
-	if !passkeyBody(r, &req) {
+	if !passkeyBody(r, &req) || strings.TrimSpace(req.Username) != "" {
 		response.WriteJSON(w, response.ErrDefault("请求参数错误"))
 		return
 	}
-	user, err := h.repo.GetUserByUsername(strings.TrimSpace(req.Username))
-	if err != nil || user == nil || user.Status != 1 {
-		response.WriteJSON(w, response.ErrDefault("无法使用通行证密钥登录"))
-		return
-	}
-	u, err := h.loadPasskeyUser(user.ID)
-	if err != nil || len(u.credentials) == 0 {
-		response.WriteJSON(w, response.ErrDefault("无法使用通行证密钥登录"))
-		return
-	}
-	options, session, err := wa.BeginLogin(u, webauthn.WithUserVerification(protocol.VerificationRequired))
+	options, session, err := wa.BeginDiscoverableLogin(webauthn.WithUserVerification(protocol.VerificationRequired))
 	if err != nil {
 		response.WriteJSON(w, response.ErrDefault("无法创建通行证密钥挑战"))
 		return
 	}
-	id, ok := h.putPasskeyCeremony(passkeyCeremony{userID: user.ID, kind: "login", origin: origin, session: *session})
+	id, ok := h.putPasskeyCeremony(passkeyCeremony{kind: "login-discoverable", origin: origin, session: *session})
 	if !ok {
 		response.WriteJSON(w, response.ErrDefault("无法创建通行证密钥挑战"))
 		return
@@ -320,22 +321,35 @@ func (h *Handler) passkeyLoginFinish(w http.ResponseWriter, r *http.Request) {
 		response.WriteJSON(w, response.ErrDefault("请求参数错误"))
 		return
 	}
-	// Login sessions carry the user ID; the caller cannot choose a different account at finish.
-	h.passkeyMu.Lock()
-	pending := h.passkeyPending[req.SessionID]
-	h.passkeyMu.Unlock()
-	session, ok := h.takePasskeyCeremony(req.SessionID, "login", origin, pending.userID)
+	pending, ok := h.takePasskeyLoginCeremony(req.SessionID, origin)
 	if !ok {
 		response.WriteJSON(w, response.ErrDefault("通行证密钥挑战已过期"))
 		return
 	}
-	u, err := h.loadPasskeyUser(pending.userID)
-	if err != nil {
-		response.WriteJSON(w, response.ErrDefault("账号不可用"))
-		return
+	resolved, credential, err := wa.FinishPasskeyLogin(func(rawID, userHandle []byte) (webauthn.User, error) {
+		// The credential ID determines ownership. A supplied userHandle cannot select another account.
+		if len(rawID) == 0 || len(userHandle) != 8 {
+			return nil, errInvalidPasskey
+		}
+		row, lookupErr := h.repo.GetPasskeyByID(base64.RawURLEncoding.EncodeToString(rawID))
+		if lookupErr != nil || row == nil {
+			return nil, errInvalidPasskey
+		}
+		owner, loadErr := h.loadPasskeyUser(row.UserID)
+		if loadErr != nil || !bytes.Equal(userHandle, owner.WebAuthnID()) {
+			return nil, errInvalidPasskey
+		}
+		return owner, nil
+	}, pending.session, credentialRequest(r, req.Credential))
+	var u passkeyUser
+	if err == nil {
+		var valid bool
+		u, valid = resolved.(passkeyUser)
+		if !valid {
+			err = errInvalidPasskey
+		}
 	}
-	credential, err := wa.FinishLogin(u, session, credentialRequest(r, req.Credential))
-	if err != nil || credential.Authenticator.CloneWarning {
+	if err != nil || credential == nil || credential.Authenticator.CloneWarning {
 		response.WriteJSON(w, response.ErrDefault("通行证密钥验证失败"))
 		return
 	}
diff --git a/go-backend/internal/http/handler/passkey_test.go b/go-backend/internal/http/handler/passkey_test.go
index 8d27cdd..c0ac5fc 100644
--- a/go-backend/internal/http/handler/passkey_test.go
+++ b/go-backend/internal/http/handler/passkey_test.go
@@ -9,21 +9,48 @@ import (
 
 func TestPasskeyChallengeExpiresAndIsSingleUse(t *testing.T) {
 	h := &Handler{passkeyPending: make(map[string]passkeyCeremony)}
-	id, ok := h.putPasskeyCeremony(passkeyCeremony{userID: 7, kind: "login", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(time.Minute)}})
+	id, ok := h.putPasskeyCeremony(passkeyCeremony{userID: 7, kind: "register", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(time.Minute)}})
 	if !ok {
 		t.Fatal("could not create challenge")
 	}
-	if _, ok := h.takePasskeyCeremony(id, "login", "https://panel.example.test", 7); !ok {
+	if _, ok := h.takePasskeyCeremony(id, "register", "https://panel.example.test", 7); !ok {
 		t.Fatal("valid challenge was rejected")
 	}
-	if _, ok := h.takePasskeyCeremony(id, "login", "https://panel.example.test", 7); ok {
+	if _, ok := h.takePasskeyCeremony(id, "register", "https://panel.example.test", 7); ok {
 		t.Fatal("challenge was reusable")
 	}
-	id, ok = h.putPasskeyCeremony(passkeyCeremony{userID: 7, kind: "login", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(-time.Second)}})
+	id, ok = h.putPasskeyCeremony(passkeyCeremony{userID: 7, kind: "register", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(-time.Second)}})
 	if !ok {
 		t.Fatal("could not create expired challenge")
 	}
-	if _, ok := h.takePasskeyCeremony(id, "login", "https://panel.example.test", 7); ok {
+	if _, ok := h.takePasskeyCeremony(id, "register", "https://panel.example.test", 7); ok {
 		t.Fatal("expired challenge was accepted")
 	}
+	id, ok = h.putPasskeyCeremony(passkeyCeremony{kind: "login-discoverable", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(time.Minute)}})
+	if !ok {
+		t.Fatal("could not create discoverable challenge")
+	}
+	if _, ok := h.takePasskeyLoginCeremony(id, "https://wrong.example.test"); ok {
+		t.Fatal("wrong origin was accepted")
+	}
+	if _, ok := h.takePasskeyLoginCeremony(id, "https://panel.example.test"); ok {
+		t.Fatal("failed discoverable challenge was reusable")
+	}
+	id, ok = h.putPasskeyCeremony(passkeyCeremony{kind: "login-discoverable", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(time.Minute)}})
+	if !ok {
+		t.Fatal("could not create discoverable challenge")
+	}
+	if _, ok := h.takePasskeyLoginCeremony(id, "https://panel.example.test"); !ok {
+		t.Fatal("valid discoverable challenge was rejected")
+	}
+	if _, ok := h.takePasskeyLoginCeremony(id, "https://panel.example.test"); ok {
+		t.Fatal("discoverable challenge was reusable")
+	}
+	id, ok = h.putPasskeyCeremony(passkeyCeremony{kind: "login-discoverable", origin: "https://panel.example.test", session: webauthn.SessionData{Expires: time.Now().Add(-time.Second)}})
+	if !ok {
+		t.Fatal("could not create expired discoverable challenge")
+	}
+	if _, ok := h.takePasskeyLoginCeremony(id, "https://panel.example.test"); ok {
+		t.Fatal("expired discoverable challenge was accepted")
+	}
 }
diff --git a/go-backend/internal/store/repo/repository_passkey.go b/go-backend/internal/store/repo/repository_passkey.go
index f475dd2..fd45f68 100644
--- a/go-backend/internal/store/repo/repository_passkey.go
+++ b/go-backend/internal/store/repo/repository_passkey.go
@@ -22,6 +22,17 @@ func (r *Repository) GetPasskey(userID int64, id string) (*model.Passkey, error)
 	return &key, err
 }
 
+// Credential IDs are unique across all users. Resolve the owner from the stored
+// credential before checking the untrusted user handle in a discoverable login.
+func (r *Repository) GetPasskeyByID(id string) (*model.Passkey, error) {
+	var key model.Passkey
+	err := r.db.Where("id = ?", id).Take(&key).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	return &key, err
+}
+
 func (r *Repository) CreatePasskey(key *model.Passkey) error {
 	return r.db.Create(key).Error
 }
diff --git a/go-backend/tests/contract/passkey_contract_test.go b/go-backend/tests/contract/passkey_contract_test.go
index a73a936..a829a99 100644
--- a/go-backend/tests/contract/passkey_contract_test.go
+++ b/go-backend/tests/contract/passkey_contract_test.go
@@ -62,7 +62,7 @@ func TestPasskeyConfigurationFailsClosedAndPasswordLoginStillWorks(t *testing.T)
 	if status["enabled"] != false {
 		t.Fatalf("invalid origin enabled passkeys: %v", status)
 	}
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-disabled"}); result.Code == 0 {
+	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{}); result.Code == 0 {
 		t.Fatal("login begin succeeded with invalid origin")
 	}
 	if result := passkeyPost(t, router, "/api/v1/user/login", "", map[string]string{"username": "passkey-disabled", "password": "test-password"}); result.Code != 0 {
@@ -70,7 +70,7 @@ func TestPasskeyConfigurationFailsClosedAndPasswordLoginStillWorks(t *testing.T)
 	}
 }
 
-func TestPasskeyRegistrationLoginAndOwnership(t *testing.T) {
+func TestPasskeyRegistrationAndOwnership(t *testing.T) {
 	t.Setenv("FLVX_WEBAUTHN_ORIGIN", passkeyTestOrigin)
 	router, r := setupContractRouter(t, "passkey-test-secret")
 	seedLegacyUser(t, r, 9302, "passkey-alice", "alice-password")
@@ -90,6 +90,10 @@ func TestPasskeyRegistrationLoginAndOwnership(t *testing.T) {
 	}
 	// The failed cross-user attempt consumes the challenge.
 	begin = passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/register/begin", aliceToken, map[string]string{"password": "alice-password"}))
+	selection := begin["options"].(map[string]interface{})["publicKey"].(map[string]interface{})["authenticatorSelection"].(map[string]interface{})
+	if selection["residentKey"] != "required" || selection["requireResidentKey"] != true {
+		t.Fatalf("registration did not require a discoverable credential: %v", selection)
+	}
 	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 	if err != nil {
 		t.Fatal(err)
@@ -113,45 +117,148 @@ func TestPasskeyRegistrationLoginAndOwnership(t *testing.T) {
 	if result := passkeyPost(t, router, "/api/v1/user/passkey/delete", bobToken, map[string]string{"id": keyID, "password": "bob-password"}); result.Code == 0 {
 		t.Fatal("Bob deleted Alice's credential")
 	}
-
-	loginBegin := passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-alice"}))
-	bad := makeAssertionResponse(t, privateKey, credentialID, passkeyChallenge(t, loginBegin), "https://wrong.example.test", "panel.example.test", true, 1)
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", map[string]interface{}{"sessionId": loginBegin["sessionId"], "credential": bad}); result.Code == 0 {
-		t.Fatal("wrong origin was accepted")
-	}
-	loginBegin = passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-alice"}))
-	assertion := makeAssertionResponse(t, privateKey, credentialID, passkeyChallenge(t, loginBegin), passkeyTestOrigin, "panel.example.test", true, 1)
-	loginBody := map[string]interface{}{"sessionId": loginBegin["sessionId"], "credential": assertion}
-	loginResult := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", loginBody)
-	if passkeyData(t, loginResult)["token"] == "" {
-		t.Fatal("passkey login returned no JWT")
-	}
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", loginBody); result.Code == 0 {
-		t.Fatal("login challenge was reusable")
-	}
-	loginBegin = passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-alice"}))
-	badRP := makeAssertionResponse(t, privateKey, credentialID, passkeyChallenge(t, loginBegin), passkeyTestOrigin, "wrong.example.test", true, 2)
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", map[string]interface{}{"sessionId": loginBegin["sessionId"], "credential": badRP}); result.Code == 0 {
-		t.Fatal("wrong RP ID was accepted")
-	}
-	loginBegin = passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-alice"}))
-	noUV := makeAssertionResponse(t, privateKey, credentialID, passkeyChallenge(t, loginBegin), passkeyTestOrigin, "panel.example.test", false, 2)
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", map[string]interface{}{"sessionId": loginBegin["sessionId"], "credential": noUV}); result.Code == 0 {
-		t.Fatal("assertion without user verification was accepted")
-	}
-	loginBegin = passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-alice"}))
-	reusedCounter := makeAssertionResponse(t, privateKey, credentialID, passkeyChallenge(t, loginBegin), passkeyTestOrigin, "panel.example.test", true, 1)
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", map[string]interface{}{"sessionId": loginBegin["sessionId"], "credential": reusedCounter}); result.Code == 0 {
-		t.Fatal("reused nonzero signature counter was accepted")
-	}
 	if result := passkeyPost(t, router, "/api/v1/user/passkey/delete", aliceToken, map[string]string{"id": keyID, "password": "wrong"}); result.Code == 0 {
 		t.Fatal("delete did not require password re-verification")
 	}
 	if result := passkeyPost(t, router, "/api/v1/user/passkey/delete", aliceToken, map[string]string{"id": keyID, "password": "alice-password"}); result.Code != 0 {
 		t.Fatalf("delete: %s", result.Msg)
 	}
-	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "passkey-alice"}); result.Code == 0 {
-		t.Fatal("deleted credential could still start login")
+	loginBegin := passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{}))
+	aliceHandle := make([]byte, 8)
+	binary.BigEndian.PutUint64(aliceHandle, 9302)
+	assertion := makeAssertionResponseWithHandle(t, privateKey, credentialID, passkeyChallenge(t, loginBegin), passkeyTestOrigin, "panel.example.test", true, 1, aliceHandle)
+	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", map[string]interface{}{"sessionId": loginBegin["sessionId"], "credential": assertion}); result.Code == 0 {
+		t.Fatal("deleted credential could still complete login")
+	}
+	// Deletion must not prevent the same account from binding a new key.
+	rebind := passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/register/begin", aliceToken, map[string]string{"password": "alice-password"}))
+	newID := make([]byte, 32)
+	if _, err := rand.Read(newID); err != nil {
+		t.Fatal(err)
+	}
+	newResponse := makeRegistrationResponse(t, privateKey, newID, passkeyChallenge(t, rebind), passkeyTestOrigin)
+	if result := passkeyPost(t, router, "/api/v1/user/passkey/register/finish", aliceToken, map[string]interface{}{"sessionId": rebind["sessionId"], "credential": newResponse}); result.Code != 0 {
+		t.Fatalf("rebind after delete: %s", result.Msg)
+	}
+	if result := passkeyPost(t, router, "/api/v1/user/login", "", map[string]string{"username": "passkey-alice", "password": "alice-password"}); result.Code != 0 {
+		t.Fatalf("password login regressed after enabling passkeys: %s", result.Msg)
+	}
+}
+
+func TestPasskeyDiscoverableLoginAndOwnership(t *testing.T) {
+	t.Setenv("FLVX_WEBAUTHN_ORIGIN", passkeyTestOrigin)
+	router, r := setupContractRouter(t, "passkey-test-secret")
+	seedLegacyUser(t, r, 9311, "discover-alice", "alice-password")
+	seedLegacyUser(t, r, 9312, "discover-bob", "bob-password")
+	aliceToken, _ := auth.GenerateToken(9311, "discover-alice", 1, "passkey-test-secret")
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	credentialID := make([]byte, 32)
+	if _, err := rand.Read(credentialID); err != nil {
+		t.Fatal(err)
+	}
+	register := passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/register/begin", aliceToken, map[string]string{"password": "alice-password"}))
+	registration := makeRegistrationResponse(t, privateKey, credentialID, passkeyChallenge(t, register), passkeyTestOrigin)
+	if result := passkeyPost(t, router, "/api/v1/user/passkey/register/finish", aliceToken, map[string]interface{}{"sessionId": register["sessionId"], "credential": registration}); result.Code != 0 {
+		t.Fatalf("register: %s", result.Msg)
+	}
+	aliceHandle := make([]byte, 8)
+	binary.BigEndian.PutUint64(aliceHandle, 9311)
+	bobHandle := make([]byte, 8)
+	binary.BigEndian.PutUint64(bobHandle, 9312)
+	begin := func(body interface{}) map[string]interface{} {
+		t.Helper()
+		return passkeyData(t, passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", body))
+	}
+	if result := passkeyPost(t, router, "/api/v1/user/passkey/login/begin", "", map[string]string{"username": "discover-alice"}); result.Code == 0 {
+		t.Fatal("username-based passkey fallback was accepted")
+	}
+	finish := func(session map[string]interface{}, assertion map[string]interface{}) response.R {
+		t.Helper()
+		return passkeyPost(t, router, "/api/v1/user/passkey/login/finish", "", map[string]interface{}{"sessionId": session["sessionId"], "credential": assertion})
+	}
+	assertionFor := func(session map[string]interface{}, handle []byte, origin, rpID string, uv bool, count uint32) map[string]interface{} {
+		t.Helper()
+		return makeAssertionResponseWithHandle(t, privateKey, credentialID, passkeyChallenge(t, session), origin, rpID, uv, count, handle)
+	}
+
+	// No username and no allowCredentials let the authenticator offer an account.
+	session := begin(map[string]string{})
+	options := session["options"].(map[string]interface{})["publicKey"].(map[string]interface{})
+	if list, exists := options["allowCredentials"]; exists && list != nil {
+		t.Fatalf("discoverable login unexpectedly restricted credentials: %v", list)
+	}
+	if options["userVerification"] != "required" {
+		t.Fatalf("discoverable login did not require UV: %v", options)
+	}
+	wrongHandle := assertionFor(session, bobHandle, passkeyTestOrigin, "panel.example.test", true, 1)
+	if result := finish(session, wrongHandle); result.Code == 0 {
+		t.Fatal("Bob's user handle selected Alice's credential")
+	}
+	if result := finish(session, wrongHandle); result.Code == 0 {
+		t.Fatal("failed discoverable challenge was reusable")
+	}
+
+	session = begin(map[string]string{})
+	// Older preferred resident-key registrations may have no discoverable userHandle.
+	missingHandle := assertionFor(session, nil, passkeyTestOrigin, "panel.example.test", true, 1)
+	if result := finish(session, missingHandle); result.Code == 0 {
+		t.Fatal("discoverable login accepted a missing user handle")
+	}
+	session = begin(map[string]string{})
+	unknownID := assertionFor(session, aliceHandle, passkeyTestOrigin, "panel.example.test", true, 1)
+	unknownID["id"] = base64.RawURLEncoding.EncodeToString([]byte("unknown-credential"))
+	unknownID["rawId"] = unknownID["id"]
+	if result := finish(session, unknownID); result.Code == 0 {
+		t.Fatal("unknown credential ID selected Alice's account")
+	}
+
+	for _, test := range []struct {
+		name   string
+		origin string
+		rpID   string
+		uv     bool
+	}{
+		{"origin", "https://wrong.example.test", "panel.example.test", true},
+		{"RP ID", passkeyTestOrigin, "wrong.example.test", true},
+		{"user verification", passkeyTestOrigin, "panel.example.test", false},
+	} {
+		session := begin(map[string]string{})
+		assertion := assertionFor(session, aliceHandle, test.origin, test.rpID, test.uv, 1)
+		if result := finish(session, assertion); result.Code == 0 {
+			t.Fatalf("invalid discoverable assertion was accepted: %s", test.name)
+		}
+	}
+	session = begin(map[string]string{})
+	badSignature := assertionFor(session, aliceHandle, passkeyTestOrigin, "panel.example.test", true, 1)
+	badSignature["response"].(map[string]interface{})["signature"] = base64.RawURLEncoding.EncodeToString([]byte("invalid-signature"))
+	if result := finish(session, badSignature); result.Code == 0 {
+		t.Fatal("invalid signature was accepted")
+	}
+
+	session = begin(map[string]string{})
+	valid := assertionFor(session, aliceHandle, passkeyTestOrigin, "panel.example.test", true, 1)
+	if got := passkeyData(t, finish(session, valid))["name"]; got != "discover-alice" {
+		t.Fatalf("discoverable login selected the wrong account: %v", got)
+	}
+	if result := finish(session, valid); result.Code == 0 {
+		t.Fatal("discoverable assertion was replayed")
+	}
+	session = begin(map[string]string{})
+	reusedCounter := assertionFor(session, aliceHandle, passkeyTestOrigin, "panel.example.test", true, 1)
+	if result := finish(session, reusedCounter); result.Code == 0 {
+		t.Fatal("discoverable login accepted a reused nonzero signature counter")
+	}
+
+	if err := r.DB().Exec("UPDATE user SET status = 0 WHERE id = ?", 9311).Error; err != nil {
+		t.Fatal(err)
+	}
+	session = begin(map[string]string{})
+	disabled := assertionFor(session, aliceHandle, passkeyTestOrigin, "panel.example.test", true, 2)
+	if result := finish(session, disabled); result.Code == 0 {
+		t.Fatal("disabled account logged in with a discoverable credential")
 	}
 }
 
@@ -180,6 +287,10 @@ func makeRegistrationResponse(t *testing.T, privateKey *ecdsa.PrivateKey, id []b
 }
 
 func makeAssertionResponse(t *testing.T, privateKey *ecdsa.PrivateKey, id []byte, challenge, origin, rpID string, verified bool, count uint32) map[string]interface{} {
+	return makeAssertionResponseWithHandle(t, privateKey, id, challenge, origin, rpID, verified, count, nil)
+}
+
+func makeAssertionResponseWithHandle(t *testing.T, privateKey *ecdsa.PrivateKey, id []byte, challenge, origin, rpID string, verified bool, count uint32, handle []byte) map[string]interface{} {
 	t.Helper()
 	rpHash := sha256.Sum256([]byte(rpID))
 	authData := append([]byte{}, rpHash[:]...)
@@ -197,5 +308,9 @@ func makeAssertionResponse(t *testing.T, privateKey *ecdsa.PrivateKey, id []byte
 	if err != nil {
 		t.Fatal(err)
 	}
-	return map[string]interface{}{"id": base64.RawURLEncoding.EncodeToString(id), "rawId": base64.RawURLEncoding.EncodeToString(id), "type": "public-key", "response": map[string]interface{}{"authenticatorData": base64.RawURLEncoding.EncodeToString(authData), "clientDataJSON": base64.RawURLEncoding.EncodeToString(client), "signature": base64.RawURLEncoding.EncodeToString(signature), "userHandle": nil}}
+	var userHandle interface{}
+	if handle != nil {
+		userHandle = base64.RawURLEncoding.EncodeToString(handle)
+	}
+	return map[string]interface{}{"id": base64.RawURLEncoding.EncodeToString(id), "rawId": base64.RawURLEncoding.EncodeToString(id), "type": "public-key", "response": map[string]interface{}{"authenticatorData": base64.RawURLEncoding.EncodeToString(authData), "clientDataJSON": base64.RawURLEncoding.EncodeToString(client), "signature": base64.RawURLEncoding.EncodeToString(signature), "userHandle": userHandle}}
 }
diff --git a/vite-frontend/src/api/index.ts b/vite-frontend/src/api/index.ts
index 8abd148..56a2267 100644
--- a/vite-frontend/src/api/index.ts
+++ b/vite-frontend/src/api/index.ts
@@ -84,8 +84,8 @@ export interface PasskeyItem {
 
 export const getPasskeyStatus = () =>
   Network.post<{ enabled: boolean }>("/user/passkey/status");
-export const beginPasskeyLogin = (username: string) =>
-  Network.post<PasskeyOptions>("/user/passkey/login/begin", { username });
+export const beginPasskeyLogin = () =>
+  Network.post<PasskeyOptions>("/user/passkey/login/begin", {});
 export const finishPasskeyLogin = (sessionId: string, credential: unknown) =>
   Network.post<LoginResponse>("/user/passkey/login/finish", {
     sessionId,
diff --git a/vite-frontend/src/pages/index.tsx b/vite-frontend/src/pages/index.tsx
index 250ec0e..a02b6f8 100644
--- a/vite-frontend/src/pages/index.tsx
+++ b/vite-frontend/src/pages/index.tsx
@@ -55,14 +55,9 @@ export default function IndexPage() {
   }, []);
 
   const handlePasskeyLogin = async () => {
-    if (!form.username.trim()) {
-      toast.error("请输入用户名");
-
-      return;
-    }
     setLoading(true);
     try {
-      const begin = await beginPasskeyLogin(form.username.trim());
+      const begin = await beginPasskeyLogin();
 
       if (begin.code !== 0) {
         toast.error(begin.msg || "无法使用通行证密钥登录");
@@ -282,9 +277,9 @@ export default function IndexPage() {
                     className="h-12 rounded-xl"
                     disabled={loading}
                     variant="bordered"
-                    onPress={handlePasskeyLogin}
+                    onPress={() => void handlePasskeyLogin()}
                   >
-                    使用通行证密钥登录
+                    选择通行证密钥登录
                   </Button>
                 )}
               </div>