AT&T Remote Port Security Device user manual Protection Process

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The RPSD system protects a port in the following manner: a call into the channel to the protected host activates the RPSD Lock. Without involving the protected host resource or its associated modem, the RPSD Lock performs a verification of the caller’s identity through a set of communications with the RPSD Key using DTMF signaling. This process is described in the following procedure and is illustrated by Figure 1-1.

1The Lock, installed on tip and ring on the network side of any modem or protected host resource, answers the incoming call.

2The Lock sends the caller a polling tone. If the calling party has an RPSD Key, the Key responds with its User ID. If there is no Key on the calling end, the Lock terminates the call.

3The Lock must recognize the Key’s User ID (it must be previously initialized with all valid Keys); if not, the Lock terminates the call.

4Using an algorithm governed by ANSI/DES standards, the Lock generates a random 10 digit value (known as the “dynamic challenge,” for which there are 10 billion possible values). Using a secret encryption key that is uniquely associated with the calling RPSD Key’s User ID, the Lock puts the value through the encryption process and encrypts it.

5It stores the encrypted “expected value,” and sends the dynamic challenge to the Key.

6The Key repeats the encryption process and calculates the necessary response. The Key transmits the “expected value” to the Lock.

7The Lock authenticates the response by comparing it to the expected value it calculated and stored. If the Lock receives the precise value it expects, it generates ringing and sends the call on to the protected resource.

The entire sequence occurs in less than 20 seconds.

FIGURE 1-1

Protection Process

1-2Getting Started

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Contents AT&T Trademark Notice Important Safety Instructions Important Safety Instructions Part 15, Subpart a FCC NoticesPart Contents Rpsd System Administration Cables, Connectors, and Ports Table TroubleshootingRpsd Key Use Device LEDsList of Figures List of Tables Getting Started Getting Started Protection Process Rpsd Lock and Key Configuration Responsibilities AudienceTypographical Conventions This Document800 Hotline or Other Service Call Numbers/AddressesInstallation Installation 2Installation Room Layout/Environment Power SupplyLocation of Administration Terminal or Printer Rpsd Lock Hardware ComponentsRpsd Power Monitor Adapter Bypass Connections PBXs Rpsd Lock Administration Printer Rpsd Lock or Key Administration TerminalOther ModemsRpsd Key Installing the Rpsd Lock Hardware Installation ProceduresCommon Rpsd Lock Configuration Connecting the Rpsd Lock to the CO Line Connecting the Rpsd Lock to the PBX Modem Rpsd Lock to Modem Rpsd Rpsd Lock to Administratlon Terminal or Printer DTE Powering Up the Rpsd Lock Installing the Rpsd Key Connecting the Rpsd Key to the Modem Connecting the Rpsd Key to the TerminalPowering Up the Rpsd Key Power-Up Behavior of Uninitialized Key Testing an Uninitialized KeyPBX Cables, Connectors, and Ports Table24Installation Software Components Aux. Port SettingsInitializing the Rpsd Lock Initializing an Rpsd Key Test Rpsd Lock Installation Rpsd System Administration Time of Day Access System Activity Log Fields of the System Activity Log entries are Enable/Disable Block AT&T and Other Key Users Single Point AdministrationForce Connect/Disconnect Authorized Keys 6RPSD System Administration Add User Rpsd System Administrator Command SetSyntax Sample Command and Response With Optional Secret Key Sample Command and Response Without Optional Secret KeyBlock User Sample Command and ResponseUnblock User Remove User Test UserList User Table First Sample Command and ResponseUser ID Second Sample Command and ResponseBlocked? Permanent?Third Sample Command and Response Restrid CR Change RestrictionStarthhmm Endhhmm Dayno N t a LR List RestrictionsRestriction ID Start TimeUR User Restrictions LH Log History Fields of the Log History screen are Device # AH Access HistoryDuration Date Time User ID Device # FH Failure HistoryReason ST Status Display LS List Statistics FC Force Connect RS Reset StatisticsDate Set FD Force DisconnectID Set Clock SetSC Set Communications Parameters Sample Help Request and Help Response Help ScreensRpsd Key Use Rpsd Key Use Last Call Status Test Access Failure MessagesRpsd Key User Command Set Set Secret Key Set User IDList User Information Set Device NumberHistory Display 08/14/90 08/14/90 131413 Date Changed OK Set Log ID RPSD/KEY11 Status Display10RPSD Key Use Wipe Out Troubleshooting Troubleshooting 2Troubleshooting Access Failure Messages Check described in Testing the Rpsd Lock Access Failure Messages Code Meaning Action 6Troubleshooting Built-in Diagnostics Testing the Rpsd LockLast Call Status Test Self CheckModem Ring Test Hardware ReplacementReplacing the PBX Modem Replacing the Lock or Key 12Troubleshooting Saving the Key Seed Value Cables, Connectors, and Ports Table Xxxxxx PBX Device LEDs Figure B-1 Front Panel LEDsAT&T Definity Rpsd Table B-2 Index Index2Index Index