Virtual Assistants
Kore.ai Platform
Key Concepts
Natural Language Processing (NLP)
Accessing Platform
Virtual Assistant Builder
Virtual Assistant Types
Getting Started
Creating a Simple Bot
Dialog Task
Dialog Builder (New)
Dialog Builder (Legacy)
User Intent Node
Dialog Node
Entity Node
Supported Entity Types
Composite Entities
Supported Colors
Supported Company Names
Form Node
Logic Node
Message Nodes
Confirmation Nodes
Bot Action Node
Service Node
Custom Authentication
2-way SSL for Service nodes
Script Node
Agent Transfer Node
WebHook Node
Grouping Nodes
Connections & Transitions
Manage Dialogs
User Prompts
Knowledge Graph
Importing and Exporting
Knowledge Extraction
Alert Tasks
Ignore Words and Field Memory
How to Schedule a Smart Alert
Small Talk
Digital Views
Configuring Digital Views
Digital Forms
How to Configure Digital Forms
Machine Learning
Model Validation
Fundamental Meaning
NLP Guidelines
Knowledge Graph
How to Use Traits
Ranking and Resolver
Advanced NLP Configurations
Context Management
Session and Context Variables
Context Object
How to Manage Context Switching
Manage Interruptions
Dialog Management
Sub-Intents & Follow-up Intents
Amend Entity
Multi-Intent Detection
Sentiment Management
Tone Analysis
Sentiment Management
Event Based Bot Actions
Default Conversations
Default Standard Responses
Talk to Bot
Utterance Testing
Batch Testing
Conversation Testing
Custom Dashboard
How to Create Custom Dashboard
Conversation Flows
NLP Metrics
Universal Bots
Enabling Languages
Smart Bots
koreUtil Libraries
Language Management
PII Settings
IVR Integration
General Settings
Import & Export
Collaborative Development
Usage Plans
Support Plans
API Overview
API List
API Collection
SDK Overview
SDK Security
SDK App Registration
Web SDK Tutorial
Message Formatting and Templates
Mobile SDK Push Notification
Widget SDK Tutorial
Widget SDK – Message Formatting and Templates
Web Socket Connect & RTM
Using the BotKit SDK
BotKit SDK Tutorial – Agent Transfer
BotKit SDK Tutorial – Flight Search Sample Bot
Using an External NLP Engine
Creating a Simple Bot
Creating a Banking Bot
Context Switching
Using Traits
Schedule a Smart Alert
Configure UI Forms
Add Form Data into Data Tables
Configuring Digital Views
Add Data to Data Tables
Update Data in Data Tables
Custom Dashboard
Custom Tags to filter Bot Metrics
Patterns for Intents & Entities
Build Knowledge Graph
Global Variables
Content Variables
Using Bot Functions
Configure Agent Transfer
Update Balance Task
Transfer Funds Task
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  4. SDKs
  5. SDK Security

SDK Security

The Kore.ai Bots Platform only accepts clients that are authorized to connect and exchange messages. You must register your SDK app with the Kore.ai Bots Platform in the Bot Builder tool and acquire client credentials. You can then use your client credentials to authorize the app and communication exchange between your user, bot, and the Bots Platform.

Securing Your SDKs

Using Kore.ai SDKs, you can create secure interactions with the Kore.ai Bots Platform.
Kore.ai SDK libraries can be embedded with web or mobile applications to make HTTPS calls and establish web socket connections with the Kore.ai Bots Platform on behalf of a user of your application chatting with a Kore.ai bot.
To establish identity and initiate a secure web session:

  • Your application SDK should sign and send the identity of the user to the Kore.ai Bots Platform
  • The Kore.ai Bots platform verifies the signature to establish trust with your application using:
    • JSON Web Token (JWT) – Used to send the user identity to Kore.ai Bots Platform
    • Bearer Token – Your application SDK exchanges the JWT for a bearer token used for subsequent calls

About JWT

Kore.ai uses the JWT (JSON Web Token) mechanism to handle the authentication.

JWT Flow

The following diagram depicts a typical JWT flow in Kore.ai Bots Platform.

JWT Tokens

JSON Web Tokens consist of three parts separated by dots ” .  ” as:

  • Header
  • Payload
  • Signature

using the hhhhh.ppppp.sssss syntax where h represents the header, p the payload, and s representing the signature.

JWT Header

The JWT Header defines the token type, which is JWT, and the security algorithm, for example,

   "alg": "HS256",
   "typ": "JWT"

The JWT type can be one of:

  • HS256 (HMAC with SHA-256) – This algorithm uses a Secret Key to sign the token. The Secret Key is generated when the app is registered in Bot Builder when defining the Web/Mobile Client channel for your bot.
  • RS256 (RSA signature with SHA-256) – This is an RSA public/private key based algorithm to sign and verify the token. The client Public Key is defined when the app is registered in the Bot Builder tool on the Kore.ai Platform. The client app signs the token using a Private Key, and the Kore.ai Bots Platform verifies this token using the Public Key.

To use these JWT types for your bot, you need to register your application and select the algorithm type. For more information about using JWT, see  https://tools.ietf.org/html/rfc7519 and https://jwt.io/introduction/.

JWT Payload

The SDK client needs to assert the user by generating unique JSON Web Token using your app registration credentials created in Bot Builder when you defined the Web/Mobile Client channel for your bot and the identity of your app user.
The following example shows a sample payload used to generate the JWT.
Sample Header

    "alg": "HS256",
    "typ": "JWT"

Sample Payload

    "iat": 1466684723,
    "exp": 1466684783,
    "jti": "1234",               //or kore_jti
    "aud": "https://idproxy.kore.ai/authorize",
    "iss": "cs-xxxxxxxxxx-1234", //or kore_iss
    "sub": "john.doe@achme.com", //or kore_sub
    "isAnonymous": false,
    "identityToMerge": "anonymoususer1@test.com" //to map anonymous user

The following table describes the parameters for the JWT Header and Payload.

Parameter Description Type

A drop-down list of security algorithms. One of:

  • RS256 – Select to enable the Public Key field. The Public Key is used by the Kore.ai Bots Platform to authenticate the client application.
  • HS256 – Select to generate a Secret Key, and a Client ID. The Client ID is required for SDK initialization, and the Secret Key used by the Kore.ai Bots Platform to authenticate the client application.
typ The token type. For JSON Web Token, enter JWT. string
iat The date/time that the token was issued. This value should be in seconds. integer
exp The date/time that the token expires. This value should be in seconds. integer


or kore_jti

A jti claim which can be used to prevent replay attacks:

The “jti” (JWT ID) claim provides a unique identifier for the JWT. The identifier value MUST be assigned in a manner that ensures that there is a negligible probability that the same value will be accidentally assigned to a different data object; if the application uses multiple issuers, collisions MUST be prevented among values produced by different issuers as well. The “jti” claim can be used to prevent the JWT from being replayed. The “jti” value is a case-sensitive string. Use of this claim is OPTIONAL.” (ref)

NOTE: Use kore_jti to bypass the pre-populated value for jti with Kore specific values

aud The audience that the token is intended for. For Kore.ai, the audience is https://idproxy.kore.com/authorize. string


or kore_iss

The ClientID of the client application. The ClientID is generated when the app is registered in the Kore.ai Bot Builder.

NOTE: Use kore_iss to bypass the pre-populated value for iss with Kore specific values



or kore_sub

The token subject which is represented by the email ID or phone number for users who are logged in the client application system. For anonymous users, the client app can generate a unique random ID and assign that ID to this field.

NOTE: Use kore_sub to bypass the pre-populated value for sub with Kore specific values

isAnonymous When set to true, the user is an anonymous user for the client application system. Anonymous users are not persisted on the Kore.ai Platform. Default setting is false. boolean


The anonymous Identity that needs to be merged into known user
refer here for details


jti Validations

In case jti claim is passed as part of the JWT payload, the platform performs the following validations:

  1. Expiry to be less than or equal to 1 hour: In case of failing to meet this requirement the following response is sent:
    {"errors":[{"msg":"error verifying the jwt: if \"jti\" claim \"exp\" must be <= 1 hour(s)","code":401}]}
  2. Restricts replay of XHR: The following response is sent in case of non-compliance:
    {"errors":[{"msg":"error verifying the jwt: possibly a replay","code":401}]}

Hosting the JWT Generation Web Service

The Kore.ai SDK libraries and UI widgets are integrated directly into your client applications, and you will need to generate the JWT from your server.

  • For the Web SDK, the SDK libraries are run from the user’s browser.
  • For mobile SDKs, the SDK libraries are run from a user’s mobile phone.

You need to host the JWT generation as a REST web service for security because the Client Secret or RSA Private Key is required for JWT generation and should not be hosted at the client application. You can make the REST web service directly available to SDK libraries or have your application call the JWT generation web service at the backend to make the JWT available to the SDK libraries.
When making the JWT generation web service available to the SDK libraries, you should keep the Client ID, Client Secret, and any key expiration logic on the server-side and expect only the user ID from the client.
There are several open-source libraries available to generate JWT, for example,

To generate credentials for your clients, you must register your client app in the Bot Builder tool. For more information, see SDK App Registration.
You can also try out our tutorial using a Kore.ai sample bot, a test application, and configuring your localhost server for JWT generation. For more information, see the Kore.ai Web SDK Tutorial.

JSON Web Encryption (JWE)

JWT is used to send user identity in a secure form by signing the payload using the Secret Key(HS-256 algorithm) or RSA Private Key(RS-256 algorithm). There can be a requirement to send additional user data along with user identity in JWT and make them available in the dialog execution context. This additional data may be sensitive information. Hence we need to send in encrypted form. JWE(JSON Web Encryption) is an IETF standard, which provides a way to send the JWT in an encrypted form.

Generating JWE

JWE token has five parts:

  • Header,
  • JWE Encrypted Key (CEK),
  • Initialization Vector,
  • Cipher Text, and
  • Authentication Tag


Header part can have the following attributes:

  • alg: defines the algorithm for content key wrapping
    Following algorithms are supported:
    • RSA-OAEP,
    • RSA1_5
  • enc: defines the algorithm for content encryption
    Following algorithms are supported for content encryption:

    • A128CBC-HS256
    • A128GCM
    • A256GCM
  • kid: Key Id of Kore Platform’s public key. This will be displayed when you enable JWE bot builder
  • typ: This will have JWT as a value since the wrapped content is JWT

Below is the decoded sample JWE header:
"alg": "RSA-OAEP",
"enc": "A128CBC-HS256",
"kid": "k-ffb4hty69-750a-44af-91c1-de0bvcf6a",
"typ": "JWT"

JWE Encrypted Key (CEK)

A symmetric key is generated to encrypt the payload using the algorithm specified in “enc” field of the header. This key is encrypted using Kore.ai Public Key using the algorithm specified in “alg” field of the header.

Initialization Vector

This is used in the encryption of the payload (JWT).

Cipher Text

This contains encrypted JWT payload. This is encrypted using the algorithm specified in “enc” field of the header using the initialization vector.

Authentication Tag

The Authentication tag is generated when authenticated encryption is performed using the algorithm specified in “enc” field of the header. This is used during decryption to ensure integrity.
Kore.ai public key will be displayed in JWK format when you enable JWE option while creating an SDK app. You can use this in your client library to generate JWE.

For more information about JWE, refer to https://tools.ietf.org/html/rfc7516.

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