diff --git a/src/main/kotlin/dev/usbharu/hideout/Application.kt b/src/main/kotlin/dev/usbharu/hideout/Application.kt
index d5ecffdc..487dcb65 100644
--- a/src/main/kotlin/dev/usbharu/hideout/Application.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/Application.kt
@@ -79,7 +79,7 @@ fun Application.parent() {
         }
         single<ActivityPubFollowService> { ActivityPubFollowServiceImpl(get(), get(), get(), get()) }
         single<ActivityPubService> { ActivityPubServiceImpl(get(), get()) }
-        single<UserService> { UserService(get()) }
+        single<UserService> { UserService(get(),get()) }
         single<ActivityPubUserService> { ActivityPubUserServiceImpl(get(), get(), get()) }
         single<ActivityPubNoteService> { ActivityPubNoteServiceImpl(get(), get(), get()) }
         single<IPostService> { PostService(get(), get()) }
@@ -93,7 +93,7 @@ fun Application.parent() {
     configureStaticRouting()
     configureMonitoring()
     configureSerialization()
-    register(inject<IUserAuthService>().value)
+    register(inject<UserService>().value)
     configureRouting(
         inject<HttpSignatureVerifyService>().value,
         inject<ActivityPubService>().value,
diff --git a/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/dto/UserCreateDto.kt b/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/dto/UserCreateDto.kt
index ddab1b2f..e8a59f26 100644
--- a/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/dto/UserCreateDto.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/dto/UserCreateDto.kt
@@ -2,7 +2,6 @@ package dev.usbharu.hideout.domain.model.hideout.dto
 
 data class UserCreateDto(
     val name:String,
-    val domain:String,
     val screenName:String,
     val description:String,
     val password:String
diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
index 50313a58..cbb6cab4 100644
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
@@ -149,8 +149,8 @@ class KtorKeyMap(private val userAuthRepository: IUserRepository) : KeyMap {
         val username = (keyId ?: throw IllegalArgumentException("keyId is null")).substringBeforeLast("#pubkey")
             .substringAfterLast("/")
         val publicBytes = Base64.getDecoder().decode(
-            userAuthRepository.findByName(
-                username
+            userAuthRepository.findByNameAndDomain(
+                username,Config.configData.domain
             )?.publicKey?.replace("-----BEGIN PUBLIC KEY-----", "-----END PUBLIC KEY-----")?.replace("", "")
                 ?.replace("\n", "")
         )
@@ -162,8 +162,8 @@ class KtorKeyMap(private val userAuthRepository: IUserRepository) : KeyMap {
         val username = (keyId ?: throw IllegalArgumentException("keyId is null")).substringBeforeLast("#pubkey")
             .substringAfterLast("/")
         val publicBytes = Base64.getDecoder().decode(
-            userAuthRepository.findByName(
-                username
+            userAuthRepository.findByNameAndDomain(
+                username,Config.configData.domain
             )?.privateKey?.replace("-----BEGIN PRIVATE KEY-----", "")?.replace("-----END PRIVATE KEY-----", "")
                 ?.replace("\n", "")
         )
diff --git a/src/main/kotlin/dev/usbharu/hideout/repository/IUserRepository.kt b/src/main/kotlin/dev/usbharu/hideout/repository/IUserRepository.kt
index 1f198526..0d19094f 100644
--- a/src/main/kotlin/dev/usbharu/hideout/repository/IUserRepository.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/repository/IUserRepository.kt
@@ -9,7 +9,11 @@ interface IUserRepository {
 
     suspend fun findByIds(ids: List<Long>): List<User>
 
-    suspend fun findByName(name: String): User?
+    suspend fun findByName(name: String): List<User>
+
+    suspend fun findByNameAndDomain(name: String, domain: String): User?
+
+    suspend fun findByDomain(domain:String): List<User>
 
     suspend fun findByNameAndDomains(names: List<Pair<String,String>>): List<User>
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/repository/UserRepository.kt b/src/main/kotlin/dev/usbharu/hideout/repository/UserRepository.kt
index 8ab5cce7..9a577a83 100644
--- a/src/main/kotlin/dev/usbharu/hideout/repository/UserRepository.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/repository/UserRepository.kt
@@ -10,7 +10,8 @@ import org.jetbrains.exposed.sql.transactions.experimental.newSuspendedTransacti
 import org.jetbrains.exposed.sql.transactions.transaction
 import java.time.Instant
 
-class UserRepository(private val database: Database,private val idGenerateService: IdGenerateService) : IUserRepository {
+class UserRepository(private val database: Database, private val idGenerateService: IdGenerateService) :
+    IUserRepository {
     init {
         transaction(database) {
             SchemaUtils.create(Users)
@@ -85,11 +86,25 @@ class UserRepository(private val database: Database,private val idGenerateServic
         }
     }
 
-    override suspend fun findByName(name: String): User? {
+    override suspend fun findByName(name: String): List<User> {
         return query {
             Users.select { Users.name eq name }.map {
                 it.toUser()
-            }.singleOrNull()
+            }
+        }
+    }
+
+    override suspend fun findByNameAndDomain(name: String, domain: String): User? {
+        return query {
+            Users.select { Users.name eq name and (Users.domain eq domain) }.singleOrNull()?.toUser()
+        }
+    }
+
+    override suspend fun findByDomain(domain: String): List<User> {
+        return query {
+            Users.select { Users.domain eq domain }.map {
+                it.toUser()
+            }
         }
     }
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt
index a6ba6d4c..b0e2f47e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/routing/RegisterRouting.kt
@@ -1,16 +1,15 @@
 package dev.usbharu.hideout.routing
 
-import dev.usbharu.hideout.plugins.UserSession
-import dev.usbharu.hideout.service.IUserAuthService
+import dev.usbharu.hideout.domain.model.hideout.dto.UserCreateDto
+import dev.usbharu.hideout.service.impl.UserService
 import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.auth.*
 import io.ktor.server.request.*
 import io.ktor.server.response.*
 import io.ktor.server.routing.*
-import io.ktor.server.sessions.*
 
-fun Application.register(userAuthService: IUserAuthService) {
+fun Application.register(userService: UserService) {
 
     routing {
         get("/register") {
@@ -39,13 +38,10 @@ fun Application.register(userAuthService: IUserAuthService) {
             val parameters = call.receiveParameters()
             val password = parameters["password"] ?: return@post call.respondRedirect("/register")
             val username = parameters["username"] ?: return@post call.respondRedirect("/register")
-            if (userAuthService.usernameAlreadyUse(username)) {
+            if (userService.usernameAlreadyUse(username)) {
                 return@post call.respondRedirect("/register")
             }
-
-            val hash = userAuthService.hash(password)
-            userAuthService.registerAccount(username,hash)
-//            call.respondRedirect("/login")
+            userService.createLocalUser(UserCreateDto(username, username, "", password))
             call.respondRedirect("/users/$username")
         }
     }
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt
index 66fc511c..d25fca2a 100644
--- a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/UserRouting.kt
@@ -1,5 +1,6 @@
 package dev.usbharu.hideout.routing.activitypub
 
+import dev.usbharu.hideout.config.Config
 import dev.usbharu.hideout.exception.ParameterNotExistException
 import dev.usbharu.hideout.plugins.respondAp
 import dev.usbharu.hideout.service.activitypub.ActivityPubUserService
@@ -24,7 +25,7 @@ fun Routing.usersAP(activityPubUserService: ActivityPubUserService, userService:
             )
         }
         get {
-            val userEntity = userService.findByName(call.parameters["name"]!!)
+            val userEntity = userService.findByNameLocalUser(call.parameters["name"]!!)
             call.respondText(userEntity.toString() + "\n" + userService.findFollowersById(userEntity.id))
         }
     }
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt
index f862f745..36948523 100644
--- a/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt
@@ -25,7 +25,7 @@ fun Routing.webfinger(userService:UserService){
                 .substringAfter("acct:")
                 .trimStart('@')
 
-            val userEntity = userService.findByName(accountName)
+            val userEntity = userService.findByNameLocalUser(accountName)
 
             val webFinger = WebFinger(
                 subject = acct,
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/IUserAuthService.kt b/src/main/kotlin/dev/usbharu/hideout/service/IUserAuthService.kt
index 1702c41b..5c792ec8 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/IUserAuthService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/IUserAuthService.kt
@@ -1,10 +1,13 @@
 package dev.usbharu.hideout.service
 
+import java.security.KeyPair
+
 interface IUserAuthService {
     fun hash(password: String): String
 
     suspend fun usernameAlreadyUse(username: String): Boolean
-    suspend fun registerAccount(username: String, hash: String)
+
+    suspend fun generateKeyPair():KeyPair
 
     suspend fun verifyAccount(username: String, password: String): Boolean
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubUserServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubUserServiceImpl.kt
index 71e10238..57d73d39 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubUserServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubUserServiceImpl.kt
@@ -28,7 +28,7 @@ class ActivityPubUserServiceImpl(
         private val logger = LoggerFactory.getLogger(this::class.java)
     override suspend fun getPersonByName(name: String): Person {
         // TODO: JOINで書き直し
-        val userEntity = userService.findByName(name)
+        val userEntity = userService.findByNameLocalUser(name)
         val userUrl = "${Config.configData.url}/users/$name"
         return Person(
             type = emptyList(),
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/impl/UserAuthService.kt b/src/main/kotlin/dev/usbharu/hideout/service/impl/UserAuthService.kt
index cd2d6ccb..41a38a41 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/impl/UserAuthService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/impl/UserAuthService.kt
@@ -1,15 +1,11 @@
 package dev.usbharu.hideout.service.impl
 
 import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.domain.model.hideout.entity.User
 import dev.usbharu.hideout.exception.UserNotFoundException
 import dev.usbharu.hideout.repository.IUserRepository
 import dev.usbharu.hideout.service.IUserAuthService
 import io.ktor.util.*
 import java.security.*
-import java.security.interfaces.RSAPrivateKey
-import java.security.interfaces.RSAPublicKey
-import java.time.Instant
 import java.util.*
 
 class UserAuthService(
@@ -27,37 +23,13 @@ class UserAuthService(
         return true
     }
 
-    @Deprecated("")
-    override suspend fun registerAccount(username: String, hash: String) {
-        val url = "${Config.configData.url}/users/$username"
-        val registerUser = User(
-            id = 0L,
-            name = username,
-            domain = Config.configData.domain,
-            screenName = username,
-            description = "",
-            inbox = "$url/inbox",
-            outbox = "$url/outbox",
-            url = url,
-            publicKey = "",
-            createdAt = Instant.now(),
-        )
-        val createdUser = userRepository.save(registerUser)
-
-        val keyPair = generateKeyPair()
-        val privateKey = keyPair.private as RSAPrivateKey
-        val publicKey = keyPair.public as RSAPublicKey
-
-        TODO()
-    }
-
     override suspend fun verifyAccount(username: String, password: String): Boolean {
-        val userEntity = userRepository.findByName(username)
+        val userEntity = userRepository.findByNameAndDomain(username, Config.configData.domain)
             ?: throw UserNotFoundException("$username was not found")
         return userEntity.password == hash(password)
     }
 
-    private fun generateKeyPair(): KeyPair {
+    override suspend fun generateKeyPair(): KeyPair {
         val keyPairGenerator = KeyPairGenerator.getInstance("RSA")
         keyPairGenerator.initialize(1024)
         return keyPairGenerator.generateKeyPair()
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/impl/UserService.kt b/src/main/kotlin/dev/usbharu/hideout/service/impl/UserService.kt
index 7c426341..c67d8ecf 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/impl/UserService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/impl/UserService.kt
@@ -1,11 +1,15 @@
 package dev.usbharu.hideout.service.impl
 
+import dev.usbharu.hideout.config.Config
+import dev.usbharu.hideout.domain.model.hideout.dto.UserCreateDto
 import dev.usbharu.hideout.domain.model.hideout.entity.User
 import dev.usbharu.hideout.exception.UserNotFoundException
 import dev.usbharu.hideout.repository.IUserRepository
+import dev.usbharu.hideout.service.IUserAuthService
 import java.lang.Integer.min
+import java.time.Instant
 
-class UserService(private val userRepository: IUserRepository) {
+class UserService(private val userRepository: IUserRepository, private val userAuthService: IUserAuthService) {
 
     private val maxLimit = 100
     suspend fun findAll(limit: Int? = maxLimit, offset: Long? = 0): List<User> {
@@ -24,12 +28,16 @@ class UserService(private val userRepository: IUserRepository) {
         return userRepository.findByIds(ids)
     }
 
-    suspend fun findByName(name: String): User {
+    suspend fun findByName(name: String): List<User> {
         return userRepository.findByName(name)
+    }
+
+    suspend fun findByNameLocalUser(name: String): User {
+        return userRepository.findByNameAndDomain(name, Config.configData.domain)
             ?: throw UserNotFoundException("$name was not found.")
     }
 
-    suspend fun findByNameAndDomains(names: List<Pair<String,String>>): List<User> {
+    suspend fun findByNameAndDomains(names: List<Pair<String, String>>): List<User> {
         return userRepository.findByNameAndDomains(names)
     }
 
@@ -41,10 +49,37 @@ class UserService(private val userRepository: IUserRepository) {
         return userRepository.findByUrls(urls)
     }
 
+    suspend fun usernameAlreadyUse(username: String): Boolean {
+        val findByNameAndDomain = userRepository.findByNameAndDomain(username, Config.configData.domain)
+        return findByNameAndDomain != null
+    }
+
+    @Deprecated("")
     suspend fun create(user: User): User {
         return userRepository.save(user)
     }
 
+    suspend fun createLocalUser(user: UserCreateDto): User {
+        val nextId = userRepository.nextId()
+        val HashedPassword = userAuthService.hash(user.password)
+        val keyPair = userAuthService.generateKeyPair()
+        val userEntity = User(
+            id = nextId,
+            name = user.name,
+            domain = Config.configData.domain,
+            screenName = user.screenName,
+            description = user.description,
+            password = HashedPassword,
+            inbox = "${Config.configData.url}/users/$nextId/inbox",
+            outbox = "${Config.configData.url}/users/$nextId/outbox",
+            url = "${Config.configData.url}/users/$nextId",
+            publicKey = keyPair.public.toPem(),
+            privateKey = keyPair.private.toString(),
+            Instant.now()
+        )
+        return userRepository.save(userEntity)
+    }
+
     suspend fun findFollowersById(id: Long): List<User> {
         return userRepository.findFollowersById(id)
     }