System and methods for digital receipts

[0001] This invention relates to systems and methods for creating digital receipts, and more specifically, to systems and methods for creating digital receipts with a reduced amount of encoded data.

[0002] A previously known stamp 100 is shown in FIG. 1. Stamp 100 may be printed by a stamp printing device. Stamp 100 includes text and a code 102 as shown in FIG. 1. Traditionally, the United States Postal Service (USPS) IBIP program has required a digital stamp to include a 2-dimensional bar code 102 that digitally encodes a large amount of information. All this information requires a large number of bytes (e.g., 80 bytes), and code 102 may require a substantial amount of space on stamp 100 as shown in FIG. 1. This causes the need to print a large 2-dimensional code 102 to accommodate the large amount of data. In addition to printing this data, the data is also held on the server which authorizes each transaction. Types of data that are be placed on stamp 100 and corresponding data lengths in bytes are shown in Table 1.

[0003]

TABLE 1
		Human-
	Barcode	Readable	Lengths	Field
Data Elements	data	Data	(Bytes)	Number
Indicia Version Number	Yes	No	1	1
Algorithm ID	Yes	No	1	2
Certification Serial	Yes	No	4	3
Number
PSD Manufacturer ID	Yes	Yes	2	4
PSD Model ID	Yes	Yes	2	5
PSD Serial Number	Yes	Yes	4	6
Ascending Register	Yes	No	5	7
Postage	Yes	Yes	3	8
Date of Mailing	Yes	Yes	4	9
Originating Address	No	Yes	—	—
(City, State, Zip code)
Originating Address	Yes	No	4	10
(Registration Zip code)
Destination Delivery	Yes	No	5	11
Point
Software ID	Yes	No	6	12
Descending Register	Yes	No	4	13
Mail Rate Category	Yes	No	4	14
Endorsement (Mail	No	Yes	—	—
Class)
Digital Signature	Yes	No	DSA = 40;	15
			RSA = 128;
			ECOSA = 40
Reserved Field	Yes	No	Variable Size	16

[0004] Because stamp 100 is larger than a typical stamp, it would be desirable to reduce the size of code 102 so that it would fit on a standard size stamp and still pvovide enough room on the stamp for a design image.

[0005] The present invention provides systems and methods for digital receipts. A digital receipt, which is digitally encoded on a medium, provides authentication of a transaction involving a service or item. A digital receipt may, for example, be printed in the form of a code on the medium. The digital receipt is scanned to verify the authenticity of the transaction.

[0006] The systems and methods of the present invention provide a secure system for creating digital receipts that may be authenticated by a verification system (e.g., at the Post Office other mail routing system), while minimizing the amount of data that is encoded in the digital receipt and maintaining the security of the data encoded therein. The digital receipt digitally encodes a transaction identification code, a transaction amount or number of services/items (i.e., units) authorized, and a digital signature. The digital receipt may be scanned or read to verify the value of the unit(s) and the authenticity of the transaction by accessing the key(s) used to authenticate the digital signature. A further understanding of the nature and advantages of the present invention may be realized by reference to the remaining portions of the specification and the drawings.

[0009] The present invention includes systems and methods for digital receipts that authenticate a transaction related to a unit (e.g., a service or item). For example, a stamp may be created with a digital receipt. The digital receipt authenticates the purchase of the stamp at a specified postage value for the purpose of transmitting a letter or package through the mail. Digital receipts of the present invention may also be used to authenticate the purchase of numerous other types of services and items.

[0010] Digital receipts digitally encode at least a transaction identification code, a transaction amount or number of units authorized, and a digital signature. An originating system authorizes a transaction and creates a digital signature. The digital signature is generated by signing the transaction identification code and the transaction amount. The transaction identification code is used to identify the transaction. The amount of the transaction or the number of units authorized is used to ensure that the image created on the stamp can also be reproduced in human readable form, and to ensure that the amount of the transaction can be authenticated without the need for the system that originally authorized the transaction. Additional information may also be encoded into the digital receipt, if desired.

[0011] Embodiments of the present invention are shown and discussed with respect to digital receipts on stamps. However, digital receipts of the present invention can be used with transactions for numerous other types of services and/or items.

[0012] FIG. 2A shows a stamp 300 which includes a first embodiment of a digital receipt created in accordance with the principles of the present invention. A stamp printing device prints stamp 300, which includes a code 301 and a design 302. Stamp 300 may be printed on a medium such as a small piece of paper. Code 301 is a digital receipt that digitally encodes a transaction identification code, a transaction amount or a number of stamps authorized, and a digital signature. The transaction amount is the monetary value that a customer paid for the stamp with digital receipt.

[0013] The transaction amount or number of stamps authorized indicates a postage value for stamp 300. The postage values indicates the face value of stamp 300. The transaction amount represents the postage value for the stamp and the monetary amount that is charged to the customer's account or credit card. The number of stamps is corresponded with a preset stamp value (e.g., 34 cents per stamp) to determine a monetary amount to charge the customer.

[0014] The transaction identification code is a series of numbers, letters, or other symbols that comprise a unique identifier for the purchase transaction. Code 301 is a two dimensional data matrix code. Code 301 may also be another suitable type of code such as a two dimensional Aztec bar code, a 3-DI code, an ArrayTag code, a Codablock code, a Code 1 code, a Code 16K code, a Code 49 code, a CP Code, a DataGlyphs code, a Datastrip Code, a Dot Code A, a hueCode, a MaxiCode, a MiniCode, a PDF 417 code, a Micro PDF417 code, a QR Code, a SmartCode, SnowFlake Code, a SuperCode, or an UltraCode.

[0015] In an embodiment of the present invention, digital receipts can be generated using a first system and a second system that is remote from the first system. The first and second systems may be, for example, a client and a remote server, respectively. The first system requests the second system for a transaction and transmits a transaction amount or number of units requested and a payment method (e.g., account number or credit card number) to the second system. The second remote system checks the customer's account for available funds. If funds are available, the second system generates a digital receipt for the transaction including a digital signature, and stores all appropriate data including, for example, key(s) for a digital signature encoded in the digital receipt, the transaction identification code, and the transaction amount or the number of units authorized. The second system then sends the digital receipt to the first system. The first system then produces the image with the digital receipt on a medium as shown, for example, in FIG. 2A. Alternatively, the first system stores the digital receipt on a computer readable medium for use at a later time, or allows the image to be produced at another source.

[0016] In another embodiment, digital receipts of the present invention can be generated by a first system that requests a plurality of transactions from a second system, which may be remote from the first system (e.g., client-server architecture). The first system transmits the amount of each transaction and a method of payment (e.g., account number or credit card number). The second system then checks for available funds, and if the second system determines that sufficient funds are available, the second system generates a digital receipt for each of the transactions including digital signatures, and stores all appropriate data, as discussed above. The second system then sends the digital receipts for each of the transactions to the first system. The first system then produces an image that includes the digital receipt on a medium as shown, for example, in FIG. 2A. Alternatively, the first system stores the digital receipt on a computer readable medium for use at a later time, or allows the image to be produced at another source.

[0017] In still another embodiment of the present invention, a single system processes requests transactions from customers and authorizes the requests. The single system produces the digital receipt and stores relevant data including the key(s) for verifying the digital signature encoded into the digital receipt. The system then stores the digital receipt or generates the digital receipt on a medium.

[0018] In one embodiment, stamps containing digital receipts of the present invention may, for example, be processed and verified by a United States Post Office (USPS) system. A Post Office scans code 301 on stamp 300 using a scanning device, which are well known in the art, to extract the digitally encoded information in code 301. The Post Office reads code 301 to verify the postage value of stamp 300. The transaction amount or number of stamps authorized indicates a postage value for stamp 300.

[0019] The Post Office system also reads the digital signature encoded in code 301 to verify the authenticity of stamp 300. The Post Office system verifies the digital signature by accessing the key(s) used to authenticate the digital signature as produced by the originating system that authorized the transaction. To reconstruct the data as required for the USPS IBIP, the USPS system must have access to the data stored on the system that authorized the original transaction. The USPS system may be in electronic communication with the authorizing system of server to access the key(s).

[0020] The nature of the key(s) used to authenticate the digital signature is determined by the cryptographic process used and is not restricted by this invention. The digital signature may, for example, comprises a public key and a private key in accordance with the Digital Signature Algorithm (DSA). DSA allows a recipient of a digital signature to verify the authenticity of the digital signature by comparing the public key with a code kept by the recipient. The private key is kept private so that the digital signature cannot be duplicated by the recipient. DSA is well known to those of skill in the art.

[0021] By encoding the transaction identification code into the digital receipt, the additional data that was encoded into code 102 in prior art stamp 100, including a date of mailing, an identification code for the software used by the stamp printing device, an identification code for the stamp printing device, an ascending register, and a descending register do not have to be encoded into code 301. All of this additional information can be stored in a database maintained by the originating system that authorized the transaction.

[0022] The database uses the transaction identification code encoded into code 301 to identify a particular transaction and to access data stored for that transaction such as the date of mailing, an ascending register, a descending register, and other information relating to the customer's account and the stamp purchase transaction. The USPS system (or other system) can access the stamp transaction data stored on the database using the transaction identification code. Therefore, the transaction identification code provides a reference for checking data (that was encoded directly into code 102 in the prior art) by merely accessing data stored on a database.

[0023] By limiting the amount of data that is digitally encoded in code 301 (e.g., 48 bytes) to a transaction ID code (e.g., 14 bits), a digital signature (e.g., 320 bits), and a transaction amount or number of units authorized (e.g., 50 bits), the size of code 301 is limited to a smaller area. The total size of stamp 300 is substantially reduced relative to prior art stamp 100, and may be the size of a typical postage stamp. Therefore, stamp 300 is more desirable and convenient to postal customers and takes up less space. Code 301 is small enough to fit into the lower half of stamp 300 as shown in FIG. 2A. Therefore, a design 302 and a postage value can be printed in the upper half of stamp 300. Design 302 makes stamp 300 more aesthetically pleasing to customers than stamp 100. Design 300 may comprise any image or pattern that can fit in the space provided.

[0024] FIG. 2B shows another embodiment of a stamp 400 with a digital receipt in accordance with the present invention. Stamp 400 is printed on a medium such as a piece of paper. Stamp 400 includes a design 402 and a digital receipt 401. Digital receipt 401 includes a transaction ID, a digital signature, and a transaction amount or number of units authorized that are digitally encoded as human readable hexadecimal numbers, as shown in FIG. 2B. The hexadecimal code in receipt 401 may contain the same information as code 301. Code 301 contains data encoded in binary.

[0025] FIG. 2C shows a further embodiment of a stamp with a digital receipt in accordance with the present invention. Stamp 500 includes a design 502 and a digital receipt 501. Digital receipt 501 includes a transaction ID, a digital signature, and a transaction amount or number of units authorized that are digitally encoded as human readable, reduced size, base 64 numbers, as shown in digital receipt 501. If desired, numbers with other bases may be used instead of numbers with base 2, base 16, and base 64 shown in the examples of FIGS. 2A-2C.

[0026] FIG. 2D is another embodiment of a stamp with a digital receipt in accordance with the present invention. Stamp 600 includes a design 602 and a digital receipt comprising a code 601. Code 601 includes a digitally encoded transaction ID, a digital signature, and a transaction amount or number of units authorized. A portion 600A of stamp 600 may be torn off from a portion 600B of stamp 600 (which includes code 601) along perforated edge 603. Portion 600A, which includes image 602, may be retained by a postal customer as a collector's item. Only portion 600B, which contains code 601, needs to be placed on a letter or package to ensure its delivery to the intended destination.

[0027] While the present invention has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosure, and it will be appreciated that in some instances some features of the invention will be employed without a corresponding use of other features without departing from the scope of the invention as set forth. Therefore, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope and spirit of the present invention. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments and equivalents falling within the scope of the claims.