Challenge‑response authentication

Overview

Remote Support Center (RSC) is an internal IBM, web-based tool that authorized IBM personnel use to support TS7785 systems remotely. RSC helps service teams monitor system status, perform approved administrative support tasks, and coordinate support activities without requiring physical access to the system.

RSC also supports secure access workflows by generating challenge–response codes. These codes validate the requester during authentication and allow the system to grant access only to the approved role and duration, consistent with least-privilege practices.

Challenge-response authentication is a security verification step that is required when accessing the TS7785 and the TSSC. Challenge-response authentication adds an additional layer of verification beyond standard login credentials. It helps prevent unauthorized remote operations and provides an audit trail for sensitive administrative activities on IBM TS7785.

When challenge-response is required

Challenge–response authentication is required for all SSH connections to the TS7785 and the TSSC.

How challenge-response works

Challenge–response controls privileged access to the IBM Tape System/Service Console (TSSC) or the IBM Storage TS7785. It verifies the requester’s identity and confirms that the requester is authorized for the selected role.

1. The service representative starts the login request for a specific role. The user will connect remotely or locally to the TSSC or TS7785, using the corresponding credentials for the selected access level.
2. Provide identification. The IBM service representative will be prompted to enter their IBM short ID in the login panel. The system displays a challenge code and the system serial number.
3. Generate the response code in RSC. In Remote Support Center (RSC), the service representative enters the serial number and the challenge code. RSC generates a response code.
4. Enter the response code. After entering the response code, the system validates the response.
5. Complete authentication. If validation succeeds, the system creates a temporary user account for the requested role and assigns a password. The password expires after 24 hours.

Result: RSC validates that the user is authorized for the requested role before generating the challenge response.

Prerequisites and access control

Before attempting operations that require challenge-response authentication, ensure that the following prerequisites are met:

• Role authorization: Role permissions are preapproved within IBM. Only approved roles can be requested and generated through RSC.
• Connectivity requirements: RSC is available only on the IBM internal network. To access RSC, the service representative must connect through the IBM VPN or be on an IBM site network.
• Security principle: Use least privilege. Assign only the minimum role required to complete the task.

Terminology

The following terms are commonly used when discussing challenge-response authentication in RSC:

Remote Support Center (RSC)

A web-based interface that IBM service personnel use to support systems remotely. RSC is used to generate response codes for challenge–response authentication and to control role-based access.

Challenge-response authentication

A security verification mechanism that requires a user to obtain and enter a response code corresponding to a system-generated challenge code. This process confirms that the user is authorized to proceed with a protected operation.

Challenge code

A unique string of characters generated by the TS7785 system when challenge-response authentication is required. The challenge code is provided to an authorized party to obtain the corresponding response code.

Challenge response code

A unique string generated in RSC from the serial number and challenge code. Enter the response code on the TSSC or TS7785 to complete authentication.

Authorized contact

An individual who is approved to generate response codes and request roles in RSC (for example, IBM service personnel).

Least privilege

A security principle that limits access to only what a user needs to complete a task. Least privilege reduces the risk of unauthorized actions and limits the impact of errors.

Short ID

An IBM employee identifier that uniquely identifies the service representative. The system uses it to associate the request with an authorized IBM user.