diff --git a/src/main/kotlin/ltd/hlaeja/security/RemoteAuthentication.kt b/src/main/kotlin/ltd/hlaeja/security/RemoteAuthentication.kt
new file mode 100644
index 0000000..b37438f
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/security/RemoteAuthentication.kt
@@ -0,0 +1,27 @@
+package ltd.hlaeja.security
+
+import org.springframework.security.core.Authentication
+import org.springframework.security.core.GrantedAuthority
+
+data class RemoteAuthentication(
+    private val remoteUserDetail: RemoteUserDetail,
+    private var authorities: MutableCollection<out GrantedAuthority>,
+    private var authenticated: Boolean = false,
+) : Authentication {
+
+    override fun getName(): String = "Hlaeja Account Registry"
+
+    override fun getAuthorities(): MutableCollection<out GrantedAuthority> = authorities
+
+    override fun getCredentials(): Any? = null
+
+    override fun getDetails(): Any? = null
+
+    override fun getPrincipal(): Any = remoteUserDetail
+
+    override fun isAuthenticated(): Boolean = authenticated
+
+    override fun setAuthenticated(isAuthenticated: Boolean) {
+        authenticated = isAuthenticated
+    }
+}
diff --git a/src/main/kotlin/ltd/hlaeja/security/RemoteReactiveAuthenticationManager.kt b/src/main/kotlin/ltd/hlaeja/security/RemoteReactiveAuthenticationManager.kt
new file mode 100644
index 0000000..d4d08b3
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/security/RemoteReactiveAuthenticationManager.kt
@@ -0,0 +1,64 @@
+package ltd.hlaeja.security
+
+import io.github.oshai.kotlinlogging.KotlinLogging
+import io.jsonwebtoken.Claims
+import io.jsonwebtoken.Jws
+import io.jsonwebtoken.JwtException
+import java.util.UUID
+import ltd.hlaeja.jwt.service.PublicJwtService
+import ltd.hlaeja.library.accountRegistry.Authentication.Response
+import ltd.hlaeja.service.AccountRegistryService
+import ltd.hlaeja.util.toAuthenticationRequest
+import org.springframework.security.authentication.AuthenticationServiceException
+import org.springframework.security.authentication.ReactiveAuthenticationManager
+import org.springframework.security.core.Authentication
+import org.springframework.security.core.authority.SimpleGrantedAuthority
+import org.springframework.stereotype.Component
+import reactor.core.publisher.Mono
+
+private val log = KotlinLogging.logger {}
+
+@Component
+class RemoteReactiveAuthenticationManager(
+    private val accountRegistryService: AccountRegistryService,
+    private val publicJwtService: PublicJwtService,
+) : ReactiveAuthenticationManager {
+
+    override fun authenticate(
+        authentication: Authentication,
+    ): Mono<Authentication> = accountRegistryService.authenticate(authentication.toAuthenticationRequest())
+        .map(::processToken)
+
+    private fun processToken(
+        response: Response,
+    ): Authentication = try {
+        publicJwtService.verify(response.token) { claims -> makeRemoteAuthentication(claims) }
+    } catch (e: JwtException) {
+        "An error occurred while processing token: ${e.message}".let {
+            log.error(e) { it }
+            throw AuthenticationServiceException(it, e)
+        }
+    }
+
+    private fun makeRemoteAuthentication(
+        claims: Jws<Claims>,
+    ) = RemoteAuthentication(
+        makeRemoteUserDetail(claims),
+        makeSimpleGrantedAuthorities(claims),
+        true,
+    )
+
+    private fun makeSimpleGrantedAuthorities(
+        claims: Jws<Claims>,
+    ): MutableList<SimpleGrantedAuthority> = (claims.payload["role"] as String)
+        .split(",")
+        .map { SimpleGrantedAuthority(it) }
+        .toMutableList()
+
+    private fun makeRemoteUserDetail(
+        claims: Jws<Claims>,
+    ): RemoteUserDetail = RemoteUserDetail(
+        UUID.fromString(claims.payload["id"] as String),
+        claims.payload["username"] as String,
+    )
+}
diff --git a/src/main/kotlin/ltd/hlaeja/security/RemoteUserDetail.kt b/src/main/kotlin/ltd/hlaeja/security/RemoteUserDetail.kt
new file mode 100644
index 0000000..6089ddf
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/security/RemoteUserDetail.kt
@@ -0,0 +1,8 @@
+package ltd.hlaeja.security
+
+import java.util.UUID
+
+data class RemoteUserDetail(
+    val id: UUID,
+    val username: String,
+)
diff --git a/src/main/kotlin/ltd/hlaeja/service/AccountRegistryService.kt b/src/main/kotlin/ltd/hlaeja/service/AccountRegistryService.kt
new file mode 100644
index 0000000..0840a76
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/service/AccountRegistryService.kt
@@ -0,0 +1,46 @@
+package ltd.hlaeja.service
+
+import io.github.oshai.kotlinlogging.KotlinLogging
+import ltd.hlaeja.library.accountRegistry.Authentication
+import ltd.hlaeja.property.AccountRegistryProperty
+import ltd.hlaeja.util.accountRegistryAuthenticate
+import org.springframework.security.authentication.AuthenticationServiceException
+import org.springframework.security.core.AuthenticationException
+import org.springframework.stereotype.Service
+import org.springframework.web.reactive.function.client.WebClient
+import org.springframework.web.reactive.function.client.WebClientRequestException
+import org.springframework.web.reactive.function.client.WebClientResponseException
+import reactor.core.publisher.Mono
+
+private val log = KotlinLogging.logger {}
+
+@Service
+class AccountRegistryService(
+    private val webClient: WebClient,
+    private val property: AccountRegistryProperty,
+) {
+
+    fun authenticate(
+        request: Authentication.Request,
+    ): Mono<Authentication.Response> = webClient.accountRegistryAuthenticate(request, property)
+        .onErrorResume { error ->
+            when (error) {
+                is AuthenticationException -> Mono.error(error)
+
+                is WebClientResponseException -> "WebClient response exception: ${error.message}".let {
+                    log.error(error) { it }
+                    Mono.error(AuthenticationServiceException(it, error))
+                }
+
+                is WebClientRequestException -> "An error occurred while making a request: ${error.message}".let {
+                    log.error(error) { it }
+                    Mono.error(AuthenticationServiceException(it, error))
+                }
+
+                else -> "An unexpected error occurred: ${error.message}".let {
+                    log.error(error) { it }
+                    Mono.error(AuthenticationServiceException(it, error))
+                }
+            }
+        }
+}
diff --git a/src/main/kotlin/ltd/hlaeja/util/Helper.kt b/src/main/kotlin/ltd/hlaeja/util/Helper.kt
new file mode 100644
index 0000000..64b7734
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/util/Helper.kt
@@ -0,0 +1,7 @@
+package ltd.hlaeja.util
+
+import io.github.oshai.kotlinlogging.KotlinLogging
+
+private val log = KotlinLogging.logger {}
+
+fun logCall(url: String) = log.debug { "calling: $url" }
diff --git a/src/main/kotlin/ltd/hlaeja/util/Mapping.kt b/src/main/kotlin/ltd/hlaeja/util/Mapping.kt
new file mode 100644
index 0000000..28978a9
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/util/Mapping.kt
@@ -0,0 +1,10 @@
+package ltd.hlaeja.util
+
+import org.springframework.security.core.Authentication as SpringAuthentication
+
+import ltd.hlaeja.library.accountRegistry.Authentication
+
+fun SpringAuthentication.toAuthenticationRequest(): Authentication.Request = Authentication.Request(
+    principal as String,
+    credentials as String,
+)
diff --git a/src/main/kotlin/ltd/hlaeja/util/WebClientCalls.kt b/src/main/kotlin/ltd/hlaeja/util/WebClientCalls.kt
new file mode 100644
index 0000000..f6c2963
--- /dev/null
+++ b/src/main/kotlin/ltd/hlaeja/util/WebClientCalls.kt
@@ -0,0 +1,24 @@
+package ltd.hlaeja.util
+
+import ltd.hlaeja.library.accountRegistry.Authentication
+import ltd.hlaeja.property.AccountRegistryProperty
+import org.springframework.http.HttpStatus.LOCKED
+import org.springframework.http.HttpStatus.NOT_FOUND
+import org.springframework.http.HttpStatus.UNAUTHORIZED
+import org.springframework.security.authentication.BadCredentialsException
+import org.springframework.security.authentication.LockedException
+import org.springframework.security.core.userdetails.UsernameNotFoundException
+import org.springframework.web.reactive.function.client.WebClient
+import reactor.core.publisher.Mono
+
+fun WebClient.accountRegistryAuthenticate(
+    request: Authentication.Request,
+    property: AccountRegistryProperty,
+): Mono<Authentication.Response> = post()
+    .uri("${property.url}/authenticate".also(::logCall))
+    .bodyValue(request)
+    .retrieve()
+    .onStatus(LOCKED::equals) { throw LockedException("Account is locked") }
+    .onStatus(UNAUTHORIZED::equals) { throw BadCredentialsException("Invalid credentials") }
+    .onStatus(NOT_FOUND::equals) { throw UsernameNotFoundException("User not found") }
+    .bodyToMono(Authentication.Response::class.java)