diff --git a/Persistence.API/Controllers/DataSaubController.cs b/Persistence.API/Controllers/DataSaubController.cs
index 60b4e48..63069a9 100644
--- a/Persistence.API/Controllers/DataSaubController.cs
+++ b/Persistence.API/Controllers/DataSaubController.cs
@@ -1,9 +1,11 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Persistence.Repositories;
 using Persistence.Repository.Data;
 
 namespace Persistence.API.Controllers;
 [ApiController]
+[Authorize]
 [Route("api/[controller]")]
 public class DataSaubController : TimeSeriesController<DataSaubDto>
 {
diff --git a/Persistence.API/Controllers/TimeSeriesController.cs b/Persistence.API/Controllers/TimeSeriesController.cs
index 154b96f..e6c74ef 100644
--- a/Persistence.API/Controllers/TimeSeriesController.cs
+++ b/Persistence.API/Controllers/TimeSeriesController.cs
@@ -1,9 +1,11 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Persistence.Models;
 using Persistence.Repositories;
 
 namespace Persistence.API.Controllers;
 [ApiController]
+[Authorize]
 [Route("api/[controller]")]
 public class TimeSeriesController<TDto> : ControllerBase, ITimeSeriesDataApi<TDto>
    where TDto : class, ITimeSeriesAbstractDto, new()
@@ -27,10 +29,8 @@ public class TimeSeriesController<TDto> : ControllerBase, ITimeSeriesDataApi<TDt
     [HttpGet("datesRange")]
     public async Task<IActionResult> GetDatesRangeAsync(CancellationToken token)
     {
-        //var result = await this.timeSeriesDataCashedRepository.GetDatesRangeAsync(token);
-        //return Ok(result);
-
-        return null;
+        var result = await this.timeSeriesDataRepository.GetDatesRangeAsync(token);
+        return Ok(result);
     }
 
     [HttpPost]
diff --git a/Persistence.API/DependencyInjection.cs b/Persistence.API/DependencyInjection.cs
new file mode 100644
index 0000000..e91e3a0
--- /dev/null
+++ b/Persistence.API/DependencyInjection.cs
@@ -0,0 +1,88 @@
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.IdentityModel.Tokens;
+using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Models;
+using System.Text.Json.Nodes;
+
+namespace Persistence.API;
+
+public static class DependencyInjection
+{
+    public static void AddSwagger(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddSwaggerGen(c =>
+        {
+            c.MapType<TimeSpan>(() => new OpenApiSchema { Type = "string", Example = new OpenApiString("0.00:00:00") });
+            c.MapType<DateOnly>(() => new OpenApiSchema { Type = "string", Format = "date" });
+            c.MapType<JsonValue>(() => new OpenApiSchema
+            {
+                AnyOf = new OpenApiSchema[]
+                {
+                    new OpenApiSchema {Type = "string", Format = "string" },
+                    new OpenApiSchema {Type = "number", Format = "int32" },
+                    new OpenApiSchema {Type = "number", Format = "float" },
+                }
+            });
+
+            c.CustomOperationIds(e =>
+            {
+                return $"{e.ActionDescriptor.RouteValues["action"]}";
+            });
+
+            c.SwaggerDoc("v1", new OpenApiInfo { Title = "Persistence web api", Version = "v1" });
+            c.AddSecurityDefinition("Keycloack", new OpenApiSecurityScheme
+            {
+                Description = @"JWT Authorization header using the Bearer scheme. Enter 'Bearer' [space] and then your token in the text input below. Example: 'Bearer 12345abcdef'",
+                Name = "Authorization",
+                In = ParameterLocation.Header,
+                Type = SecuritySchemeType.OAuth2,
+                Flows = new OpenApiOAuthFlows
+                {
+                    Implicit = new OpenApiOAuthFlow
+                    {
+                        AuthorizationUrl = new Uri(configuration["Authentication:AuthorizationUrl"]),
+                    }
+                }
+            });
+
+            c.AddSecurityRequirement(new OpenApiSecurityRequirement()
+            {
+                {
+                    new OpenApiSecurityScheme
+                    {
+                        Reference = new OpenApiReference
+                        {
+                            Type = ReferenceType.SecurityScheme,
+                            Id = "Keycloack"
+                        },
+                        Scheme = "Bearer",
+                        Name = "Bearer",
+                        In = ParameterLocation.Header,
+                    },
+                    new List<string>()
+                }
+            });
+
+            //var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
+            //var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
+            //var includeControllerXmlComment = true;
+            //c.IncludeXmlComments(xmlPath, includeControllerXmlComment);
+            //c.IncludeXmlComments(Path.Combine(AppContext.BaseDirectory, "AsbCloudApp.xml"), includeControllerXmlComment);
+        });
+    }
+
+    public static void AddJWTAuthentication(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+            .AddJwtBearer(o =>
+            {
+                o.RequireHttpsMetadata = false;
+                o.Audience = configuration["Authentication:Audience"];
+                o.MetadataAddress = configuration["Authentication:MetadataAddress"]!;
+                o.TokenValidationParameters = new TokenValidationParameters
+                {
+                    ValidIssuer = configuration["Authentication:ValidIssuer"],
+                };
+            });
+    }
+}
diff --git a/Persistence.API/Extensions.cs b/Persistence.API/Extensions.cs
new file mode 100644
index 0000000..601a2f4
--- /dev/null
+++ b/Persistence.API/Extensions.cs
@@ -0,0 +1,26 @@
+using System.ComponentModel;
+using System.Security.Claims;
+
+namespace Persistence.API;
+
+public static class Extensions
+{
+    public static T GetUserId<T>(this ClaimsPrincipal principal)
+    {
+        if (principal == null)
+            throw new ArgumentNullException(nameof(principal));
+
+        var loggedInUserId = principal.FindFirstValue(ClaimTypes.NameIdentifier);
+
+        if (String.IsNullOrEmpty(loggedInUserId))
+            throw new ArgumentNullException(nameof(loggedInUserId));
+
+        var result = TypeDescriptor.GetConverter(typeof(T)).ConvertFromInvariantString(loggedInUserId);
+
+        if (result is null)
+            throw new ArgumentNullException(nameof(result));
+
+        return (T)result;
+
+    }
+}
diff --git a/Persistence.API/Persistence.API.csproj b/Persistence.API/Persistence.API.csproj
index 40bed8a..2b8cb73 100644
--- a/Persistence.API/Persistence.API.csproj
+++ b/Persistence.API/Persistence.API.csproj
@@ -8,6 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.10" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.19.6" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
diff --git a/Persistence.API/Startup.cs b/Persistence.API/Startup.cs
index 1afaa18..32466c8 100644
--- a/Persistence.API/Startup.cs
+++ b/Persistence.API/Startup.cs
@@ -19,9 +19,10 @@ public class Startup
         services.AddControllers();
         // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
         services.AddEndpointsApiExplorer();
-        services.AddSwaggerGen();
-        services.AddPersistenceDbContext(Configuration);
+        services.AddSwagger(Configuration);
         services.AddInfrastructure();
+        services.AddPersistenceDbContext(Configuration);
+        services.AddJWTAuthentication(Configuration);
     }
 
     public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
@@ -32,7 +33,8 @@ public class Startup
 
         app.UseRouting();
 
-        //app.UseAuthorization();
+        app.UseAuthentication();
+        app.UseAuthorization();
 
         app.UseEndpoints(endpoints =>
         {
diff --git a/Persistence.API/appsettings.json b/Persistence.API/appsettings.json
index 14eabf9..2e0033b 100644
--- a/Persistence.API/appsettings.json
+++ b/Persistence.API/appsettings.json
@@ -6,7 +6,13 @@
     }
   },
   "ConnectionStrings": {
-    "DefaultConnection": "Host=localhost;Database=persistence;Username=postgres;Password=q;Persist Security Info=True",
+    "DefaultConnection": "Host=localhost;Database=persistence;Username=postgres;Password=q;Persist Security Info=True"
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "Authentication": {
+    "MetadataAddress": "http://localhost:8080/realms/TestRealm/.well-known/openid-configuration",
+    "Audience": "account",
+    "ValidIssuer": "http://localhost:8080/realms/TestRealm",
+    "AuthorizationUrl": "http://localhost:8080/realms/TestRealm/protocol/openid-connect/auth"
+  }
 }