WO1998057304A1 - Virtual postage meter with secure digital signature device - Google Patents
Virtual postage meter with secure digital signature device Download PDFInfo
- Publication number
- WO1998057304A1 WO1998057304A1 PCT/US1998/012276 US9812276W WO9857304A1 WO 1998057304 A1 WO1998057304 A1 WO 1998057304A1 US 9812276 W US9812276 W US 9812276W WO 9857304 A1 WO9857304 A1 WO 9857304A1
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- WIPO (PCT)
- Prior art keywords
- meter
- postage
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- information
- database
- Prior art date
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Classifications
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- G06Q20/02—Payment architectures, schemes or protocols involving a neutral party, e.g. certification authority, notary or trusted third party [TTP]
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Definitions
- the present invention relates generally to a postage metering system and method for evidencing postage payment in an open system and, more particularly, to a postage metering system and method for evidencing postage payment in a virtual meter configuration.
- Postage metering systems have been developed which employ encrypted information that is printed on a mailpiece as part of an indicium evidencing postage payment.
- the encrypted information includes a postage value for the mailpiece combined with other postal data that relate to the mailpiece and the postage meter printing the indicium.
- the encrypted information typically referred to as a digital token or a digital signature, authenticates and protects the integrity of information, including the postage value, imprinted on the mailpiece for later verification of postage payment. Since the digital token incorporates encrypted information relating to the evidencing of postage payment, altering the printed information in an indicium is detectable by standard verification procedures. Examples of systems that generate and print such indicium are described in U.S. Patent Numbers 4,725,718, 4,757,537, 4,775,246 and
- a closed system the system functionality is solely dedicated to metering activity.
- closed system metering devices also referred to as postage evidencing devices
- postage evidencing devices include conventional digital and analog (mechanical and electronic) postage meters wherein a dedicated printer is securely coupled to a metering or accounting function.
- a dedicated printer is securely coupled to a metering or accounting function.
- the printer is securely coupled and dedicated to the meter, and printing evidence of postage cannot take place without accounting for the evidence of postage.
- an open system the printer is not dedicated to the metering activity, freeing system functionality for multiple and diverse uses in addition to the metering activity.
- open system metering devices examples include personal computer (PC) based devices with single/multi-tasking operating systems, multiuser applications and digital printers.
- An open system metering device is a postage evidencing device with a non-dedicated printer that is not securely coupled to a secure accounting module.
- An open system indicium printed by the non-dedicated printer is made secure by including addressee information in the encrypted evidence of postage printed on the mailpiece for subsequent verification. See U.S. Patent Numbers 4,725,718 and 4,831 ,555, each assigned to the assignee of the present invention.
- USPS United States Postal Service
- IBIP Information-based Indicia Program
- the program relies on digital signature techniques to produce for each envelope an indicium whose origin can be authenticated and content cannot be modified.
- IBIP is expected to support new methods of applying postage in addition to the current approach, which typically relies on a postage meter to print indicia on mailpieces.
- IBIP requires printing a large, high density, two-dimensional ("2-D") bar code on a mailpiece.
- the 2-D bar code encodes information and is signed with a digital signature.
- the USPS has published draft specifications for IBIP. The
- IBIP Indicium Specification defines the proposed requirements for a new indicium that will be applied to mail being created using IBIP.
- the INFORMATION BASED INDICIA PROGRAM POSTAL SECURITY DEVICE SPECIFICATION dated June 13, 1996, and revised July 23, 1997
- PSD Postal Security Device
- the INFORMATION BASED INDICIA PROGRAM HOST SYSTEM SPECIFICATION dated October 9, 1996, defines the proposed requirements for a host system element of IBIP ("IBIP Host Specification").
- IBIP includes interfacing user, postal and vendor infrastructures which are the system elements of the program.
- the INFORMATION BASED INDICIA PROGRAM KEY MANAGEMENT PLAN SPECIFICATION dated April 25, 1997, defines the generation, distribution, use and replacement of the cryptographic keys used by the USPS product/service provider and PSDs ("IBIP KMS Specification").
- the specifications are collectively referred to herein as the "IBIP Specifications”.
- the IBIP Specifications define a stand-alone open metering system, referred to herein as a PC Meter comprising a PSD coupled to a personal computer ("PC") which operates as a host system with a printer coupled thereto ("Host PC").
- the Host PC runs the metering application software and associated libraries (collectively referred to herein as "Host Applications”) and communicates with one or more attached PSDs.
- the PC Meter can only access PSDs coupled to the Host PC. There is no remote PSD access for the PC Meter.
- the PC Meter processes transactions for dispensing postage, registration and refill on the Host PC. Processing is performed locally between the Host PC and the PSD coupled thereto. Connections to a Data Center, for example for registration and refill transactions, are made locally from the Host PC through a local or network modem/internet connection. Accounting for debits and credits to the PSD is also performed locally, logging the transactions on the Host PC.
- the Host PC may accommodate more than one PSD, for example supporting one
- PSD per serial port.
- application programs running on the Host PC such as a word processor or an envelope designer, may access the Host Applications.
- the IBIP Specifications do not address an IBIP open metering system on a network environment. However, the specifications do not prohibit such a network-based system.
- a network Server controls remote printing requested by a Client PC on the network. Of course, the Client PC controls any local printing.
- One version of a network metering system referred to herein as a "virtual meter", has many Host PCs without any PSDs coupled thereto.
- the Host PCs run Host Applications, but all PSD functions are performed on Server(s) located at a Data Center.
- the PSD functions at the Data Center may be performed in a secure device attached to a computer at the Data Center, or may be performed in the Data Center computer itself.
- the Host PCs must connect with the Data Center to process transactions such as postage dispensing, meter registration, or meter refills. Transactions are requested by the Host PC and sent to the Data Center for remote processing. The transactions are processed centrally at the Data Center and the results are returned to the Host PC. Accounting for funds and transaction processing are centralized at the Data Center. See, for example, U.S. Patent Numbers 5,454,038 and 4,873,645, which are assigned to the assignee of the present invention.
- the virtual meter does not conform to all the current requirements of the IBIP Specifications.
- the IBIP Specifications do not permit PSD functions to be performed at the Data Center.
- a virtual meter configuration with each mailer's PSD located at the Data Center may provide an equivalent level of security as required by the IBIP Specifications.
- digital printing postage meters typically include a digital printer coupled to a metering (accounting) device, which is referred to herein as a postal security device (PSD).
- PSD postal security device
- Digital printing postage meters have removed the need for physical inspection by cryptographically securing the link between the accounting and printing mechanisms.
- new digital printing postage meters create a secure point to point communication link between the PSD and print head. See, for example, U.S. Patent Number 4,802,218, issued to Christopher B. Wright et al. and now assigned to the assignee of the present invention.
- An example of a digital printing postage meter with secure print head communication is the Personal Post OfficeTM manufactured by Pitney Bowes Inc. of Stamford, Connecticut.
- U.S. Patents Number 4,873,645 and 5,454,3,0308 a virtual metering system and method are disclosed wherein the postal accounting and token generation occur at a data center remote from the postage evidencing printer.
- the Data Center may be a secure facility, there remain certain inherent security issues since the accounting and token generation functions do not occur in a secure device local to the postage printer.
- the virtual postage metering system includes a computer coupled to an unsecured printer and to a remote data metering system. The postal accounting and the token generation occur at the Data Center.
- the Data Center is a centralized facility under the control of a meter vendor, such as Pitney Bowes, or the Postal Service. As such, it is regarded as secure compared to the environment that customers handle meters directly. However, data stored at the Data Center is accessible to Data Center personnel and, therefore, at a minimum, subject to at least inadvertent modification by such personnel. Any unauthorized changes to the user and meter data stored at the Data Center compromises the integrity of the virtual metering system.
- a virtual postage metering system provides benefits that are not available under conventional postage payment systems.
- a virtual postage metering system provides central management of all postage without the need to manage physical meters or PSDs.
- a further benefit is the opportunity to directly associate a mailer to each mailpiece as opposed to each reset.
- no metering hardware i.e. postage meter or PSD, is needed.
- mailers need to maintain current lists of valid addresses, such as with purchased CD-ROMs.
- Mailers can acquire postage on an as-needed basis.
- meter vendors do not have to keep track of physical meters.
- a virtual postage metering system eliminates stolen or relocated meter problems and simplifies meter management in general.
- the present invention provides digital data security for a Data Center of a virtual postage metering system that prevents inadvertent and intentional modifications to meter and user data stored at the Data Center.
- security boxes are used to protect against unauthorized alteration of meter and user records stored at the data center.
- the present invention also provides secure control of digital token generation process and the associated secure accounting for each postage evidencing transaction occurring at the data center.
- Security issues for the virtual postage metering system include user authentication, financial and postage transactions, and meter records.
- the database hold encryption keys in cipher text and not in plain text.
- all data, including a time stamp or sequence number, used to complete the transaction are digitally signed and the signature is stored as part of the updated transaction record. It has been found that maintaining transaction records in this manner prevents inadvertent modification of the records. Although the digital signature provides reasonable security, it is not bulletproof. It has been found that a historically signed record could be used in place of a current record requiring a more robust verification system to detect such "tampering". In accordance with the present invention, another level of security is added. It has been found that once the signature is verified, the transaction data can be checked for freshness to eliminate any possibility of tampering, inadvertent or intentional.
- a system and method of evidencing postage payment provides a secure box is used to sign the transaction data and to authenticate meter and user records.
- the system and method includes a data center with a database having a plurality of meter records stored therein. Each meter record includes meter information corresponding to a metering account assigned to each of a plurality of remote user devices that are authorized to request evidence of postage payment.
- a secure co-processor device in the data center obtains the appropriate meter record and verifies the authenticity of the meter record by verifying a signature in the meter record and comparing freshness data in the meter record to freshness data in the secure device.
- the secure device If verified, the secure device then accounts for an amount of postage to be evidenced, generating evidence of postage payment and updates the meter information, including the freshness data, in the meter record. The secure device then signs the updated meter information and stores the signature in the meter record. The secure device then returns the updated meter record to the database.
- FIG. 1 is a block diagram of a virtual postage metering system for dispensing postage embodying the principles of the present invention
- Fig. 2 is a bock diagram of the Data Center database server and secure box for the virtual postage metering system of Fig. 1 ;
- Fig. 3 is a flow chart of the process for evidencing postage by the virtual postage metering system of Fig. 1 ;
- Fig. 4 is a flow chart of the process performed within the secure meter box of the virtual postage metering system of Fig. 1.
- a virtual postage metering system generally designated 10.
- the virtual postage metering system 10 includes a plurality (only one is shown) of personal computer (PC) systems, generally designated 20, each having access to a printer 22 for printing evidence of postage on an envelope or label.
- PC 20 is connected with a transaction processing Data Center 30 that performs postal accounting and evidencing of postage.
- the virtual postage metering system 10 allows each mailer to use a conventional PC to remotely obtain evidence of postage payment on an as needed basis.
- virtual postage metering system 10 does not include any meter hardware located at the mailer's site. Nor are any postal funds stored at the mailer's site. All metering and accounting of funds occur at Data Center 30 using functional software and database records representing each mailer's "postage meter", referred to herein as a "meter account”.
- the accounting method for virtual postage metering system 10 may be a conventional prepayment or post-payment system.
- the preferred method a prepayment method wherein each mailer is required to put a minimum amount of money into the mailer's virtual meter account. As account funds drop below a specific level a refill is charged against the mailer's account.
- An alternate accounting method that is suitable for a virtual postage metering system is a real-time payment method in which the amount of a transaction is charged to a mailer's credit card account when the transaction occurs. This method is referred to herein as a "trickle charge" postage payment, because the mailer does not pay for postage for a mailpiece until the mailer is ready to print the mailpiece.
- a "meter" vendor such as Pitney Bowes Inc.
- client software that runs on PC 20
- the client software may be downloaded from the vendor's Internet server.
- the client software may be the Internet browser based home pages that provide user interactions with the Data Center 30.
- the meter vendor also manages Data Center 30.
- the client software initiates communications with Data Center 30 which performs metering transactions to evidence postage for single mailpieces or batches of mailpieces.
- the client software establishes a connection to the Data Center, and requests postage by providing postal information relating to the requested transactions, such as postage amount, addressee information and (optionally) the origin of deposit for each mailpiece.
- Data Center 30 receives the postal information, determines the origin zip for the mailpiece(s), performs accounting functions and generates an encrypted evidence of postage payment, such as a token or digital signature, and sends indicium information including the token, to PC 20.
- PC 20 receives the indicium information, creates an indicium bitmap, which can be displayed on a PC monitor (not shown) and printed on the mailpiece by printer 22.
- PC 20 then disconnects from Data Center 30 or requests another transaction.
- the connection between PC 20 and Data Center 30 may be through a Network Service Provider, such as on the Internet, or by direct dial using the PC's modem.
- Virtual postage metering system 10 eliminates the need to maintain and account for traditional metering devices at each mailer's site and provides flexibility for handling requests from multiple origins of deposit by each mailer.
- Virtual postage metering system 10 also provides value added services that are not available with conventional meter devices, such as, real-time address hygiene, direct marketing services and trickle charge postage payment.
- Virtual postage metering system 10 provides user authentication by Data Center 30 to identify mailers with valid accounts. When a mailer has been authenticated for each request, for example, by a usemame, password or other conventional methods, Data Center 30 services the request, and returns indicium information to the PC 20 where the indicium is created and printed on the mailpiece.
- the mailer initiates a postage evidencing transaction by running client software in PC 20, which contacts Data Center 30.
- a Communication Server 32 supports connectivity from various communication technologies and protocols.
- the Communication Server merges all incoming traffic and routes it to a Function Server 34, which includes application software that supports mailer sign-on, postage dispensing and postal reporting. All mailer and meter information is accessed from a Database Server 36 where the information is securely stored using secure cryptographic processes and protocols as described below.
- Data Center 30 maintains cryptographic keys for each meter account in Database Server 36. The cryptographic keys are used for postage evidencing and verification as well as for security of the records stored in Database Server 36.
- a Key Management System 38 administers all cryptographic keys used in virtual postage metering system 10.
- the cryptographic keys may be distributed to verifiers in remote locations.
- U.S. Patent Application Serial No. 08/553812 filed October 23, 1995, and assigned to the assignee of the present invention, describes such a key management system.
- a mailer may establish a meter account through an on-line sign-up process with Data Center 30. During sign-up, the mailer enters, at PC 20, account information, such as user name, password and method of payment.
- Data Center 30 preferably administered by a meter vendor, such as Pitney Bowes Inc., arranges all meter licenses and agreements between its mailers and the Post.
- the PSD does not exist, i.e., there is no metering device coupled to the PC from which postage payment is requested.
- Virtual postage metering system 10 replaces the accounting and metering functions of the PSD with metering software at PC 20 and mailer account information performed and updated at Data Center 30.
- the virtual postage metering system 10 provides each mailer with a metering system that has the capability of originating transactions from multiple origins of deposit. See, for example, previously noted International Patent Application Serial Number [Attorney Docket E-735].
- one or more cryptographic modules are located within Data Center 30 and are used to perform cryptographic processes.
- Each secure box is a secure, tamper-evident and tamper-responding device, including a processor and memory, that stores encryption keys and performs cryptographic operations using the keys within the secure boundary of the device.
- Data Center 30 includes several types of secure boxes, which are described below. In the preferred embodiment, Data Center 30 includes multiple boxes of each type for redundancy and performance.
- Key Management System 38 includes a manufacturing box (not shown) that provides top-level keys used to generate random numbers for seeding each of the other secure boxes. By sharing a common cryptographic key, the secure boxes communicate securely within Data Center 30.
- Key Management System 38 also includes a "steel" box (not shown) that shares a common key with meter box 44 (described below) to encrypt decrypt master token keys for postage evidencing transactions for each meter account.
- the steel box merges a vendor key and a postal key into one record in cipher text.
- Data Center 30 creates a logical meter, i.e. a meter record, in Database Server 36 by generating a token key using the vendor and postal keys, initializing meter registers (ascending and descending), meter freshness data (described below) and other postal information as part of the meter record, and then storing the meter record in Database Server 36.
- Data Center 30 also includes a meter box 44 that shares a secret key with the steel box for decrypting the token key encrypted in the meter record.
- Meter box 44 also holds the key used for digital signature of transaction records. The only other information stored in meter box 44 is freshness data for each meter record processed by meter box 44.
- meter box 44 For each postage transaction, meter box 44 generates at least one digital token or signs the postage transaction, and updates the meter record corresponding to the transaction.
- Each meter record in Database Server 36 includes postal funds as well as the token keys in cipher text.
- Meter box 44 uses the token keys to generate tokens, updates the postal funds in the meter record, and signs the updated meter record. In this manner, meter box 44 performs and controls the secure accounting for each transaction.
- Meter box 44 can also be used to verify the token or the transaction signature for verification of the postage evidencing for the transaction.
- Data Center 30 also includes an authentication box 40 that shares a different secret key with the steel box to decrypt an user authentication key stored in cipher text in Database Server 36.
- Authentication box 40 also executes the authentication algorithms using the decrypted authentication key to authenticate a mailer. This function may be added to the steel box of key management system 38 to eliminate the need for a separate box at Data Center 30.
- Data Center 30 includes an transaction box 42 that shares another secret key with the steel box to sign user transaction records other than the meter records signed by meter box 44, such as logins and login history records. Transaction box 42 later verifies the transaction record signature when the next transaction is requested.
- Meter database 60 comprises meter information associated for each meter account, such as, meter serial number, record update counter, ascending register, descending register and other postal values.
- Mailer database 62 comprises mailer information and information that associates a mailer with a meter account.
- Communication Server 32 receives a request for a meter transaction from mailer PC 20.
- the application software in the Function Server 34 controls the processing of the transaction request.
- Function Server 34 accesses mailer database 62 and meter database 60 to obtain records, including the appropriate meter record 64, corresponding to the meter account of the mailer initiating the request.
- Function Server 34 communicates mailer records from mailer database 62 to authentication box 40, which then authenticates the mailer requesting the transaction. Once the mailer has been authenticated, Function Server 34 communicates the appropriate meter record 64 to meter box 44, which verifies a signature and freshness data for the record.
- Meter box 44 decrypts the encrypted key(s) that are stored within meter record 64, performs accounting functions on the ascending and descending registers in meter record 64, and uses the key(s) to generate a token for the requested transaction. Meter box 44 then generates data for an indicium, and resigns meter record 64. The updated and signed record is then sent back to Database Server 36 where it is stored as part of meter database 60.
- the authentication keys are not available in plain text, but must be distributed to the mailer. Conventional methods of distributing and updating the authentication key for each mailer can be used. See, for example, previously noted U.S. Patent Application Serial Number 08/553,812, which describes a key management system for distributing and updating cryptographic keys to the secure boxes and the mailer's PC.
- key management system 38 One of the important tasks for key management system 38 is to obtain the postal key and associate it with a vendor key.
- the steel box creates a meter serial number, manufacturing number, vendor and postal keys in one meter record 64 for each meter account.
- a set of triple DES keys are used for encrypting the encryption keys for generating a tokens or signatures for indicia.
- Another set of triple DES keys are used for signing meter records.
- Meter box 44 securely stores both sets of triple DES keys.
- a derived key is used in order avoid using only one key to encrypt the entire set of meter keys for generating a tokens or signatures for indicia.
- the first set of triple DES keys derives triple DES keys by encrypting the meter (account) serial number in each meter record.
- the derived triple DES keys then encrypt the encryption keys for the indicia which are to be stored in the Database Server 36.
- the second set of triple DES keys for signing uses a similar scheme to derive the signature keys in a similar manner, i.e. using the meter serial number as data to derive keys. It will be understood that one set of triple DES keys can be used for both purposes. However, it is desirable that each set of keys be used only for one purpose.
- one common key is used to sign all transactions and records that require a digital signature, such as, meter records, postage transactions, funds transfer records, master account records, etc. Multiple boxes of each box are used for redundancy and to share the workload as the number of transactions grow.
- the signing box such as meter box 44 or authentication box 40, will also verify the signature of a record.
- a message authentication code is employed to provide message integrity for the sensitive virtual meter records. This MAC involves multiple applications of the Data Encryption Standard (DES).
- DES Data Encryption Standard
- the signature keys will be updated using the current month and year. During manufacturing, two initial master keys will be entered into the non-volatile memory (NVM) of meter box 44.
- NVM non-volatile memory
- NVM is used both for permanent storage and for the prevention of external access to the key information.
- the keys for indicia and the keys for signature are derived in a conventional manner, such as described above.
- the virtual meter record signature verification algorithm simply recalculates the signature of the meter record 64 using the signature algorithm and data within meter record 64 and compares calculated signature to the signature in meter record 64.
- Communication Server 32 receives a request for postage evidencing from mailer PC 20.
- Function Server 34 requests access to the mailers account information stored in Database Server 36.
- Database Server 36 sends mailer information, meter information, including a meter record associated with the mailer initiating the request.
- Function Server 34 sends the mailer information to Authentication Box 40.
- Function Server 34 sends the meter information, including the meter record to meter box 44.
- meter box 44 authenticates the meter record, decrypts the encrypted token key which is part of the record, verifies freshness of the record, performs accounting, generates a token, updates the freshness data and signs the meter record, which is returned to Function Server 34.
- Function Server 34 sends the updated and signed meter record to Database Server 36 and sends to the Communication Server 32 the token and associated postal information needed to create an indicium.
- Database Server 36 stores the updated and signed meter record.
- Communication Server 32 sends the token and postal information to mailer PC 20.
- meter box 44 receives a signed meter record.
- the signature of the meter record is verified. If not verified at step 210, then, at step 215, the meter box ends the transaction and alerts the Function Server 34 for possible tampering.
- the meter box compares freshness data that is stored in meter box for each meter account to freshness data stored as part of the meter record. The freshness data chosen for this comparison must be data that is unique for each transaction. In the preferred embodiment, the record update counter is used, however a random number, time stamp or other nonce may be used. The comparison at step 220 prevents inadvertent or intentional substitution of an old meter record for the current meter record during the virtual postage metering transaction.
- the compared freshness data are not identical, then, at step 225
- the meter box ends the transaction and alerts the Function Server 34 for possible tampering. If the freshness data stored in the meter record is identical to the freshness data associated with the meter record which is stored in the meter box, then, at step 235, the meter box decrypts the token key that was received in encrypted form as part of the meter record. At step 240, the meter box performs accounting functions for the transaction, such as incrementing the ascending register, decrementing the descending register and incrementing the record update counter. At step 245, the freshness data in the meter record is updated. At step 250, the freshness data stored in meter box 44 is updated. At step 255, the meter box generates the token using the decrypted token key.
- the meter box updates the meter record by storing the new register values and record update counter in the meter record, and then signs the updated record using a key stored in the meter box.
- the meter box sends the updated and signed meter record to Database Server 36 for storage until the next transaction for the meter account assigned to the meter record.
- the present invention is applicable to any value metering system that includes transaction evidencing, such as monetary transactions, item transactions and information transactions.
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Abstract
Description
Claims
Priority Applications (7)
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DE69836123T DE69836123T2 (en) | 1997-06-13 | 1998-06-12 | VIRTUAL FRANKING MACHINE WITH SAFE DIGITAL SIGNATURE VERIFICATION DEVICE |
EP98930183A EP0931299B1 (en) | 1997-06-13 | 1998-06-12 | Virtual postage meter with secure digital signature device |
CA002263131A CA2263131C (en) | 1997-06-13 | 1998-06-12 | Virtual postage meter with secure digital signature device |
BRPI9805995-5A BR9805995B1 (en) | 1997-06-12 | 1998-06-12 | Secure postage franchise delivery system and process for evidencing postage payment. |
AU79638/98A AU736669B2 (en) | 1997-06-12 | 1998-06-12 | Virtual postage meter with secure digital signature device |
JP50326699A JP4117912B2 (en) | 1997-06-13 | 1998-06-12 | Virtual postage meter with secure digital signature device |
US09/242,207 US6466921B1 (en) | 1997-06-13 | 1998-06-12 | Virtual postage meter with secure digital signature device |
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PCT/US1998/012438 WO1998057306A1 (en) | 1997-06-13 | 1998-06-12 | System and method for controlling a postage metering using data required for printing |
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PCT/US1998/012385 WO1998057305A1 (en) | 1997-06-12 | 1998-06-12 | System and method for dynamic selection of appropriate postal rates based on metering data |
PCT/US1998/012276 WO1998057304A1 (en) | 1997-06-12 | 1998-06-12 | Virtual postage meter with secure digital signature device |
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PCT/US1998/012438 WO1998057306A1 (en) | 1997-06-13 | 1998-06-12 | System and method for controlling a postage metering using data required for printing |
PCT/US1998/012081 WO1998057302A1 (en) | 1997-06-13 | 1998-06-12 | Virtual postage metering system |
PCT/US1998/012385 WO1998057305A1 (en) | 1997-06-12 | 1998-06-12 | System and method for dynamic selection of appropriate postal rates based on metering data |
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