diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt
index 1e4aeb2d..d1bebb2b 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/inbox/InboxJobProcessor.kt
@@ -14,6 +14,7 @@ import dev.usbharu.hideout.core.query.UserQueryService
 import dev.usbharu.hideout.core.service.job.JobProcessor
 import dev.usbharu.hideout.util.RsaUtil
 import dev.usbharu.httpsignature.common.HttpHeaders
+import dev.usbharu.httpsignature.common.HttpMethod
 import dev.usbharu.httpsignature.common.HttpRequest
 import dev.usbharu.httpsignature.common.PublicKey
 import dev.usbharu.httpsignature.verify.HttpSignatureVerifier
@@ -34,6 +35,15 @@ class InboxJobProcessor(
 ) : JobProcessor<InboxJobParam, InboxJob> {
 
     private suspend fun verifyHttpSignature(httpRequest: HttpRequest, signature: Signature): Boolean {
+
+        val requiredHeaders = when (httpRequest.method) {
+            HttpMethod.GET -> getRequiredHeaders
+            HttpMethod.POST -> postRequiredHeaders
+        }
+        if (signature.headers.containsAll(requiredHeaders).not()) {
+            return false
+        }
+
         val user = try {
             userQueryService.findByKeyId(signature.keyId)
         } catch (_: FailedToGetResourcesException) {
@@ -96,5 +106,7 @@ class InboxJobProcessor(
 
     companion object {
         private val logger = LoggerFactory.getLogger(InboxJobProcessor::class.java)
+        private val postRequiredHeaders = listOf("(request-target)", "date", "host", "digest")
+        private val getRequiredHeaders = listOf("(request-target)", "date", "host")
     }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt b/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt
index dece6e79..84df4aa3 100644
--- a/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt
@@ -121,7 +121,7 @@ class SecurityConfig {
         userQueryService: UserQueryService
     ): HttpSignatureFilter {
         val httpSignatureFilter =
-            HttpSignatureFilter(DefaultSignatureHeaderParser(), transaction, apUserService, userQueryService)
+            HttpSignatureFilter(DefaultSignatureHeaderParser())
         httpSignatureFilter.setAuthenticationManager(authenticationManager)
         httpSignatureFilter.setContinueFilterChainOnUnsuccessfulAuthentication(false)
         val authenticationEntryPointFailureHandler =
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureFilter.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureFilter.kt
index e814e568..d4332651 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureFilter.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureFilter.kt
@@ -1,23 +1,15 @@
 package dev.usbharu.hideout.core.infrastructure.springframework.httpsignature
 
-import dev.usbharu.hideout.activitypub.service.objects.user.APUserService
-import dev.usbharu.hideout.application.external.Transaction
-import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
-import dev.usbharu.hideout.core.query.UserQueryService
 import dev.usbharu.httpsignature.common.HttpHeaders
 import dev.usbharu.httpsignature.common.HttpMethod
 import dev.usbharu.httpsignature.common.HttpRequest
 import dev.usbharu.httpsignature.verify.SignatureHeaderParser
 import jakarta.servlet.http.HttpServletRequest
-import kotlinx.coroutines.runBlocking
 import org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter
 import java.net.URL
 
 class HttpSignatureFilter(
-    private val httpSignatureHeaderParser: SignatureHeaderParser,
-    private val transaction: Transaction,
-    private val apUserService: APUserService,
-    private val userQueryService: UserQueryService
+    private val httpSignatureHeaderParser: SignatureHeaderParser
 ) :
     AbstractPreAuthenticatedProcessingFilter() {
     override fun getPreAuthenticatedPrincipal(request: HttpServletRequest?): Any? {
@@ -33,15 +25,6 @@ class HttpSignatureFilter(
         } catch (_: RuntimeException) {
             return ""
         }
-        runBlocking {
-            transaction.transaction {
-                try {
-                    userQueryService.findByKeyId(signature.keyId)
-                } catch (_: FailedToGetResourcesException) {
-                    apUserService.fetchPerson(signature.keyId)
-                }
-            }
-        }
         return signature.keyId
     }
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureUserDetailsService.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureUserDetailsService.kt
index a2e2a258..3acc12f6 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureUserDetailsService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/springframework/httpsignature/HttpSignatureUserDetailsService.kt
@@ -5,10 +5,12 @@ import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
 import dev.usbharu.hideout.core.domain.exception.HttpSignatureVerifyException
 import dev.usbharu.hideout.core.query.UserQueryService
 import dev.usbharu.hideout.util.RsaUtil
+import dev.usbharu.httpsignature.common.HttpMethod
 import dev.usbharu.httpsignature.common.HttpRequest
 import dev.usbharu.httpsignature.common.PublicKey
 import dev.usbharu.httpsignature.verify.FailedVerification
 import dev.usbharu.httpsignature.verify.HttpSignatureVerifier
+import dev.usbharu.httpsignature.verify.SignatureHeaderParser
 import kotlinx.coroutines.runBlocking
 import org.slf4j.LoggerFactory
 import org.springframework.security.authentication.BadCredentialsException
@@ -20,14 +22,16 @@ import org.springframework.security.web.authentication.preauth.PreAuthenticatedA
 class HttpSignatureUserDetailsService(
     private val userQueryService: UserQueryService,
     private val httpSignatureVerifier: HttpSignatureVerifier,
-    private val transaction: Transaction
+    private val transaction: Transaction,
+    private val httpSignatureHeaderParser: SignatureHeaderParser
 ) :
     AuthenticationUserDetailsService<PreAuthenticatedAuthenticationToken> {
     override fun loadUserDetails(token: PreAuthenticatedAuthenticationToken): UserDetails = runBlocking {
         if (token.principal !is String) {
             throw IllegalStateException("Token is not String")
         }
-        if (token.credentials !is HttpRequest) {
+        val credentials = token.credentials
+        if (credentials !is HttpRequest) {
             throw IllegalStateException("Credentials is not HttpRequest")
         }
 
@@ -40,10 +44,25 @@ class HttpSignatureUserDetailsService(
             }
         }
 
+        val signature = httpSignatureHeaderParser.parse(credentials.headers)
+
+        val requiredHeaders = when (credentials.method) {
+            HttpMethod.GET -> getRequiredHeaders
+            HttpMethod.POST -> postRequiredHeaders
+        }
+        if (signature.headers.containsAll(requiredHeaders).not()) {
+            logger.warn(
+                "FAILED Verify HTTP Signature. required headers: {} but actual: {}",
+                requiredHeaders,
+                signature.headers
+            )
+            throw BadCredentialsException("HTTP Signature. required headers: $requiredHeaders")
+        }
+
         @Suppress("TooGenericExceptionCaught")
         val verify = try {
             httpSignatureVerifier.verify(
-                token.credentials as HttpRequest,
+                credentials,
                 PublicKey(RsaUtil.decodeRsaPublicKeyPem(findByKeyId.publicKey), keyId)
             )
         } catch (e: RuntimeException) {
@@ -67,5 +86,7 @@ class HttpSignatureUserDetailsService(
 
     companion object {
         private val logger = LoggerFactory.getLogger(HttpSignatureUserDetailsService::class.java)
+        private val postRequiredHeaders = listOf("(request-target)", "date", "host", "digest")
+        private val getRequiredHeaders = listOf("(request-target)", "date", "host")
     }
 }