diff --git a/backend/src/federation/authenticateCommunities.ts b/backend/src/federation/authenticateCommunities.ts
index bd69c1ab4..ad07f230a 100644
--- a/backend/src/federation/authenticateCommunities.ts
+++ b/backend/src/federation/authenticateCommunities.ts
@@ -6,7 +6,7 @@ import { CONFIG } from '@/config'
 // eslint-disable-next-line camelcase
 import { AuthenticationClient as V1_0_AuthenticationClient } from '@/federation/client/1_0/AuthenticationClient'
 import { backendLogger as logger } from '@/server/logger'
-
+import { stringToHex } from '@/util/utilities'
 
 import { OpenConnectionArgs } from './client/1_0/model/OpenConnectionArgs'
 import { AuthenticationClientFactory } from './client/AuthenticationClientFactory'
@@ -23,7 +23,7 @@ export async function startCommunityAuthentication(
   logger.debug(
     'Authentication: started for foreignFedCom:',
     foreignFedCom.endPoint,
-    foreignFedCom.publicKey.toString('hex'),
+    stringToHex(foreignFedCom.publicKey.toString()),
   )
   // check if communityUuid is a valid v4Uuid and not still a temporary onetimecode
   if (
diff --git a/backend/src/federation/client/1_0/AuthenticationClient.ts b/backend/src/federation/client/1_0/AuthenticationClient.ts
index 642819c99..03f2e15d6 100644
--- a/backend/src/federation/client/1_0/AuthenticationClient.ts
+++ b/backend/src/federation/client/1_0/AuthenticationClient.ts
@@ -2,6 +2,7 @@ import { FederatedCommunity as DbFederatedCommunity } from '@entity/FederatedCom
 import { GraphQLClient } from 'graphql-request'
 
 import { backendLogger as logger } from '@/server/logger'
+import { stringToHex } from '@/util/utilities'
 
 import { OpenConnectionArgs } from './model/OpenConnectionArgs'
 import { openConnection } from './query/openConnection'
@@ -29,7 +30,7 @@ export class AuthenticationClient {
     logger.debug(
       `Authentication: openConnection at ${this.endpoint} for args:`,
       args.url,
-      Buffer.from(args.publicKey, 'hex').toString(),
+      stringToHex(args.publicKey),
     )
     try {
       // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
diff --git a/backend/src/util/utilities.ts b/backend/src/util/utilities.ts
index 904c86226..fcf0c6143 100644
--- a/backend/src/util/utilities.ts
+++ b/backend/src/util/utilities.ts
@@ -15,3 +15,10 @@ export const decimalSeparatorByLanguage = (a: Decimal, language: string): string
 
 export const fullName = (firstName: string, lastName: string): string =>
   [firstName, lastName].filter(Boolean).join(' ')
+
+export function stringToHex(str: string): string {
+  return str
+    .split('')
+    .map((char) => char.charCodeAt(0).toString(16).padStart(2, '0'))
+    .join('')
+}
diff --git a/federation/src/graphql/api/1_0/resolver/AuthenticationResolver.ts b/federation/src/graphql/api/1_0/resolver/AuthenticationResolver.ts
index a6e58e523..5ec45b55a 100644
--- a/federation/src/graphql/api/1_0/resolver/AuthenticationResolver.ts
+++ b/federation/src/graphql/api/1_0/resolver/AuthenticationResolver.ts
@@ -9,6 +9,7 @@ import { startAuthentication, startOpenConnectionCallback } from '../util/authen
 import { OpenConnectionCallbackArgs } from '../model/OpenConnectionCallbackArgs'
 import { CONFIG } from '@/config'
 import { AuthenticationArgs } from '../model/AuthenticationArgs'
+import { stringToHex } from '@/util/utilities'
 
 @Resolver()
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
@@ -21,7 +22,7 @@ export class AuthenticationResolver {
     logger.debug(
       `Authentication: openConnection() via apiVersion=1_0 ...`,
       args.url,
-      Buffer.from(args.publicKey, 'hex').toString(),
+      stringToHex(args.publicKey),
     )
 
     // first find with args.publicKey the community, which starts openConnection request
@@ -29,10 +30,7 @@ export class AuthenticationResolver {
       publicKey: Buffer.from(args.publicKey),
     })
     if (!requestedCom) {
-      throw new LogError(
-        `unknown requesting community with publicKey`,
-        Buffer.from(args.publicKey, 'hex').toString(),
-      )
+      throw new LogError(`unknown requesting community with publicKey`, stringToHex(args.publicKey))
     }
     logger.debug(`Authentication: found requestedCom:`, requestedCom)
     // no await to respond immediatly and invoke callback-request asynchron
diff --git a/federation/src/graphql/api/1_0/util/authenticateCommunity.ts b/federation/src/graphql/api/1_0/util/authenticateCommunity.ts
index 63c41989c..95c558f98 100644
--- a/federation/src/graphql/api/1_0/util/authenticateCommunity.ts
+++ b/federation/src/graphql/api/1_0/util/authenticateCommunity.ts
@@ -9,6 +9,7 @@ import { AuthenticationClientFactory } from '@/client/AuthenticationClientFactor
 // eslint-disable-next-line camelcase
 import { AuthenticationClient as V1_0_AuthenticationClient } from '@/client/1_0/AuthenticationClient'
 import { AuthenticationArgs } from '../model/AuthenticationArgs'
+import { stringToHex } from '@/util/utilities'
 
 export async function startOpenConnectionCallback(
   args: OpenConnectionArgs,
@@ -18,7 +19,7 @@ export async function startOpenConnectionCallback(
   logger.debug(
     `Authentication: startOpenConnectionCallback() with:`,
     args.url,
-    Buffer.from(args.publicKey, 'hex').toString(),
+    stringToHex(args.publicKey),
     requestedCom,
   )
   try {
diff --git a/federation/src/util/utilities.ts b/federation/src/util/utilities.ts
new file mode 100644
index 000000000..215a52559
--- /dev/null
+++ b/federation/src/util/utilities.ts
@@ -0,0 +1,6 @@
+export function stringToHex(str: string): string {
+  return str
+    .split('')
+    .map((char) => char.charCodeAt(0).toString(16).padStart(2, '0'))
+    .join('')
+}