US20170104601A1 - Elongated physical unclonable function - Google Patents
Elongated physical unclonable function Download PDFInfo
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- US20170104601A1 US20170104601A1 US15/192,177 US201615192177A US2017104601A1 US 20170104601 A1 US20170104601 A1 US 20170104601A1 US 201615192177 A US201615192177 A US 201615192177A US 2017104601 A1 US2017104601 A1 US 2017104601A1
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- Prior art keywords
- puf
- longitudinal axis
- magnet
- millimeters
- supply item
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- 238000003384 imaging method Methods 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 2
- 239000006249 magnetic particle Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 230000006870 function Effects 0.000 description 9
- 239000004033 plastic Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910000521 B alloy Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 229910000583 Nd alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000003362 replicative effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004634 thermosetting polymer Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3271—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using challenge-response
- H04L9/3278—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using challenge-response using physically unclonable functions [PUF]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17543—Cartridge presence detection or type identification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17543—Cartridge presence detection or type identification
- B41J2/1755—Cartridge presence detection or type identification mechanically
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0863—Arrangements for preparing, mixing, supplying or dispensing developer provided with identifying means or means for storing process- or use parameters, e.g. an electronic memory
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1875—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit provided with identifying means or means for storing process- or use parameters, e.g. lifetime of the cartridge
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
- G09C1/00—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/18—Cartridge systems
- G03G2221/1823—Cartridges having electronically readable memory
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
Description
- This application is a continuation-in-part of Ser. No. 14/879,199 filed Oct. 9, 2015 and claims priority to it. The following applications are related and were filed contemporaneously: “INJECTION-MOLDED PHYSICAL UNCLONABLE FUNCTION”, “ELONGATE PHYSICAL UNCLONABLE FUNCTION”, “PHYSICAL UNCLONABLE FUNCTION ON A SUPPLY ITEM”, and “TOOTHED-RACK PHYSICAL UNCLONABLE FUNCTION”.
- 1. Field of the Disclosure
- The present disclosure relates generally to anti-counterfeit systems and more particularly to physical unclonable functions.
- 2. Description of the Related Art
- Counterfeit printer supplies, such as toner bottles, are a problem for consumers. Counterfeit supplies may perform poorly and may damage printers. Printer manufacturers use authentication systems to deter counterfeiters. Physical unclonable functions (PUF) are a type of authentication system that implements a physical one-way function. Ideally, a PUF cannot be identically replicated and thus is difficult to counterfeit. Thus, it is advantageous to maximize the difficulty of replicating a PUF to deter counterfeiters. It is also advantageous for the PUF and PUF reader to be low cost, robust, and repeatable.
- The invention, in one form thereof, is directed to an imaging device supply item having a body; an elongate PUF located on the body having a longitudinal axis and containing a plurality of magnetized particles each having a volume less than one cubic millimeter in a non-magnetic substrate; and a magnet having a volume of at least five cubic millimeters located on the body within five millimeters, inclusive, of the PUF located on the longitudinal axis of the PUF.
- The invention, in another form thereof, is directed to an imaging device supply item having a body having a body surface; an elongate PUF located on the surface having a longitudinal axis, each particle has a volume that is less than one cubic millimeter and the majority of the particles have a magnetic pole orientation that is not orthogonal to the body surface; and a magnet that has a volume that is more than five cubic millimeters located between two and ten millimeters from the PUF and is located on the longitudinal axis and has a magnetic pole orientation that is orthogonal to the body surface.
- The accompanying drawings incorporated in and forming a part of the specification, illustrate several aspects of the present disclosure, and together with the description serve to explain the principles of the present disclosure.
-
FIG. 1 is a block diagram of an imaging system including an image forming device according to one example embodiment. -
FIG. 2 is a side view of an elongate PUF. -
FIG. 3 andFIG. 4 are isometrics views of an imaging device supply item having the elongate PUF. -
FIG. 5 andFIG. 7 are isometric views of an imaging device supply item having a toothed-rack PUF. -
FIG. 6 is a top view of the toothed-rack PUF. -
FIG. 8 is a flowchart of a method of manufacturing a PUF, - In the following description, reference is made to the accompanying drawings where like numerals represent like elements. The embodiments are described in sufficient detail to enable those skilled in the art to practice the present disclosure. It is to be understood that other embodiments may be utilized and that process, electrical, and mechanical changes, etc., may be made without departing from the scope of the present disclosure. Examples merely typify possible variations. Portions and features of some embodiments may be included in or substituted for those of others. The following description, therefore, is not to be taken in a limiting sense and the scope of the present disclosure is defined only by the appended claims and their equivalents.
- Referring to the drawings and particularly to
FIG. 1 , there is shown a block diagram depiction of animaging system 50 according to one example embodiment.Imaging system 50 includes animage forming device 100 and acomputer 60.Image forming device 100 communicates withcomputer 60 via acommunications link 70. As used herein, the term “communications link” generally refers to any structure that facilitates electronic communication between multiple components and may operate using wired or wireless technology and may include communications over the Internet. - In the example embodiment shown in
FIG. 1 ,image forming device 100 is a multifunction device (sometimes referred to as an all-in-one (AIO) device) that includes acontroller 102, auser interface 104, aprint engine 110, a laser scan unit (LSU) 112, one or more toner bottles orcartridges 200, one ormore imaging units 300, afuser 120, amedia feed system 130 andmedia input tray 140, and ascanner system 150.Image forming device 100 may communicate withcomputer 60 via a standard communication protocol, such as, for example, universal serial bus (USB). Ethernet or IEEE 802.xx.Image forming device 100 may be, for example, an electrophotographic printer/copier including an integratedscanner system 150 or a standalone electrophotographic printer. -
Controller 102 includes a processor unit and associatedmemory 103 and may be formed as one or more Application Specific Integrated Circuits (ASICs).Memory 103 may be any volatile or non-volatile memory or combination thereof such as, for example, random access memory (RAM), read only memory (ROM), flash memory and/or non-volatile RAM (NA/RAM). Alternatively,memory 103 may be in the form of a separate electronic memory (e.g., RAM, ROM, and/or NVRAM), a hard drive, a CD or DVD drive, or any memory device convenient for use withcontroller 102.Controller 102 may be, for example, a combined printer and scanner controller. - In the example embodiment illustrated,
controller 102 communicates withprint engine 110 via acommunications link 160.Controller 102 communicates with imaging unit(s) 300 andprocessing circuitry 301 on eachimaging unit 300 via communications link(s) 161.Controller 102 communicates with toner cartridge(s) 200 andnon-volatile memory 201 on eachtoner cartridge 200 via communications link(s) 162.Controller 102 communicates withfuser 120 and processing circuitry 11 thereon via acommunications link 163.Controller 102 communicates withmedia feed system 130 via acommunications link 164.Controller 102 communicates withscanner system 150 via acommunications link 165.User interface 104 is communicatively coupled to controller 102 via acommunications link 166.Processing circuitry fuser 120, toner cartridge(s) 200 and imaging unit(s) 300, respectively.Controller 102 processes print and scan data and operatesprint engine 110 during printing andscanner system 150 during scanning. -
Computer 60, which is optional, may be, for example, a personal computer, includingmemory 62, such as RAM, ROM, and/or NVRAM, aninput device 64, such as a keyboard and/or a mouse, and adisplay monitor 66.Computer 60 also includes a processor, input/output (I/O) interfaces, and may include at least one mass data storage device, such as a hard drive, a CD-ROM and/or a DVD unit (not shown).Computer 60 may also be a device capable of communicating withimage forming device 100 other than a personal computer such as, for example, a tablet computer, a smartphone, or other electronic device. - In the example embodiment illustrated,
computer 60 includes in its memory a software program including program instructions that function as animaging driver 68, e.g., printer/scanner driver software, forimage forming device 100.Imaging driver 68 is in communication withcontroller 102 ofimage forming device 100 viacommunications link 70.Imaging driver 68 facilitates communication betweenimage forming device 100 andcomputer 60. One aspect ofimaging driver 68 may be, for example, to provide formatted print data to image formingdevice 100, and more particularly to printengine 110, to print an image. Another aspect ofimaging driver 68 may be, for example, to facilitate the collection of scanned data fromscanner system 150. - In some circumstances, it may be desirable to operate
image forming device 100 in a standalone mode. In the standalone mode,image forming device 100 is capable of functioning withoutcomputer 60. Accordingly, all or a portion ofimaging driver 68, or a similar driver, may be located incontroller 102 ofimage forming device 100 so as to accommodate printing and/or scanning functionality when operating in the standalone mode. - Several components of the
image forming device 100 are user replaceablee.g. toner cartridge 200,fuser 120, andimaging unit 300. It is advantageous to prevent counterfeiting these user replaceable components. APUF 202 may be attached to thetoner cartridge 200 to prevent counterfeiting as described below. APUF reader 203 may be integrated into theimage forming device 100 to verify the authenticity of thePUF 202. Data related to thePUF 202 may reside innon-volatile memory 201 and is preferably encrypted. This data may be generated at the time of manufacture by measuring thePUF 202 at the factory. Thenon-volatile memory 201 is preferably located on the supply item along with thePUF 202. To verify the authenticity of thePUF 202, theimage forming device 100 measures the magnetic field generated by thePUF 202 in one or more directions along a measurement path and compares these measurements to data in thenon-volatile memory 201. -
FIG. 2 shows aPUF 210 next to amagnet 212. ThePUF 210 is elongate and has alongitudinal axis 214. ThePUF 210 contains a plurality ofmagnetized particles 216 each having a volume less than one cubic millimeter. Themagnetized particles 216 may be, for example, flakes of an alloy of neodymium, iron and boron (NdFeB). Themagnet 212 is located on thelongitudinal axis 214 and is separated from thePUF 210 by a distance D. Preferably, themagnet 212 has a volume of at least five cubic millimeters so that the magnet's magnetic field is much greater than the magnetic field of aparticle 216. - The
PUF 210 may be read by moving a magnetic sensor along thelongitudinal axis 214. The magnetic sensor will have a much higher reading when positioned over themagnet 212 and thus themagnet 212 designates a home position from which readings of the PUF may be referenced spatially. Preferably, the distance D is five millimeters or less to minimize the overall travel of the positioning mechanism of the magnetic sensor to reduce cost. Preferably, thePUF 210 andmagnet 212 are mounted to a planar surface, the magnetic sensor measures orthogonal to the surface, the magnet has a magnetic pole orientation that is orthogonal to the surface, and the majority of theparticles 216 have a magnetic pole orientation that is not orthogonal to the body surface. This is to maximize the difference between measurements of themagnet 212 and theparticles 216 to give a clear home position signal. The magnetic sensor may measure along multiple orthogonal directions. - Preferably, the
magnet 212 has multiplenorth poles south poles magnet 212 may be fabricated by joining discrete magnets having alternating poles into one magnet. The alternating poles limits the magnetic field seen by theparticles 216 and thus limits the effect of themagnet 212 on theparticles 216. This allows themagnet 212 to be placed near thePUF 210 without disturbing the signature of thePUF 210. -
FIG. 3 shows an imagingdevice supply item 300, for example a toner bottle, with thePUF 210 andmagnet 212 located on asurface 310 of abody 312 located on theback side 314 of thebody 312. ThePUF 210 andmagnet 212 may be used by an imaging device to verify the authenticity of thesupply item 300. -
FIG. 4 shows thefront side 410 of thebody 312 including ahandle 412 located on thefront side 410. Thehandle 412 is configured to pivot about apivot axis 414 that is parallel to the PUFlongitudinal axis 214. Thepivot axis 414 is parallel to the longitudinal dimension of thebody 312, which allows a larger, and thus easier to usehandle 412 than if the handle was rotated ninety degrees. Similarly, the PUFlongitudinal axis 214 is parallel to the longitudinal dimension of thebody 312, which allows a longer and thus more difficult to clone PUF. It is preferential to locate thePUF 210 on theback side 314 so the magnetic sensor may be protected by being as far from the user as possible. Also, the magnetic sensor may be spring biased toward thePUF 210 to insure proper gap spacing for accurate measurements without being in the insertion path of the imagingdevice supply item 300. -
FIG. 5 shows an imagingdevice supply item 500 having aPUF 510 slidably attached to abody 512 by a pair ofsnaps face 518 of thePUF 510 contains magnetic particles as described previously. -
FIG. 6 shows a top view of thePUF 510, snaps 514, 516, and aspring 520. ThePUF 510 has atoothed rack 522 having alongitudinal axis 524. ThePUF 510 hasslots snaps PUF 510 to move linearly relative to thebody 512 parallel to thelongitudinal axis 524. - An imaging device reads the
PUF 510 using a stationary magnetic sensor. ThePUF 510 is moved linearly by mating a gear with the teeth of thetoothed rack 522 and turning the gear. Preferably, the PUF moves at least ten millimeters to read a sufficient length of thePUF 510 to make it difficult to counterfeit thePUF 510. It is preferable to use a stationary magnetic sensor to reduce cost. ThePUF 510 is returned to a home position, e.g. against thesnaps spring 520. -
FIG. 7 shows another view of thesupply item 500. A handle is located on thefront side 712 of the body opposite thePUF 510 located on theback side 714 of the body. - The insertion path of the
supply item 500 is defined byrails 716 that run front-to-back. Thus, it is preferable to locate thePUF 510 on theback side 714 to simplify mating with the gear used to move thePUF 510. -
FIG. 8 shows a flowchart of a method of manufacturing a PUF. Themethod 800 uses an injection molding machine to make an injection-molded PUF. As is known in the art, injection molding machines heat feed material until it is molten and then forces the feed material through a nozzle into a mold cavity. Once the material is cooled enough to harden, the injection molded part is ejected from the injection molding machine. - At
block 810, feed material is obtained containing plastic and magnetizable flakes that are not magnetized. The plastic may be, for example, a thermoplastic, a thermosetting polymer, etc. The magnetizable flakes may be, for example, an alloy of neodymium, iron and boron. Other magnetizable particles may be used, for example, spheres, rods, etc. Preferably, the feed material contains between ten and twenty percent, inclusive, by weight magnetizable flakes to maximize the variability in the magnetic signature of the PUF while maintaining good flow within the mold. - At
block 812, the flakes are magnetized. Alternatively, feed material may be used that contains pre-magnetized flakes. It is preferable to magnetize the flakes after they are enveloped by the plastic to prevent the flakes from clumping together. - At
block 814, the feed material is fed into an injection molding machine. The feed material may be fed as solid pellets containing plastic and magnetic material, pellets containing plastic as well as pellets containing both plastic and magnetic material, etc. - At
block 816, the magnetized alloy is heated to below its Curie temperature. It is necessary to heat the feed material so that it will flow into the mold. However, it is preferable to avoid heating the magnetized alloy to above its Curie temperature to avoid degrading the magnetic fields generated by the magnetic particles. - At
block 818, the feed material is formed into an injection-molded PUF. For example, the feed material may be forced through one or more nozzles into a mold cavity. The turbulent flow of the feed material through the nozzle and through the mold cavity creates a random distribution and orientation of the magnetic particles, which creates a highly random magnetic signature for each PUF. The random magnetic signature makes it very difficult to reproduce a PUF. This process may economically produce the toothed-rack PUF 510 described above. - The foregoing description illustrates various aspects and examples of the present disclosure. It is not intended to be exhaustive. Rather, it is chosen to illustrate the principles of the present disclosure and its practical application to enable one of ordinary skill in the art to utilize the present disclosure, including its various modifications that naturally follow. All modifications and variations are contemplated within the scope of the present disclosure as determined by the appended claims. Relatively apparent modifications include combining one or more features of various embodiments with features of other embodiments.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/192,177 US9608828B1 (en) | 2015-10-09 | 2016-06-24 | Elongated physical unclonable function |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/879,199 US9553582B1 (en) | 2015-10-09 | 2015-10-09 | Physical unclonable functions having magnetic and non-magnetic particles |
US15/192,177 US9608828B1 (en) | 2015-10-09 | 2016-06-24 | Elongated physical unclonable function |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/879,199 Continuation-In-Part US9553582B1 (en) | 2015-10-09 | 2015-10-09 | Physical unclonable functions having magnetic and non-magnetic particles |
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US9608828B1 US9608828B1 (en) | 2017-03-28 |
US20170104601A1 true US20170104601A1 (en) | 2017-04-13 |
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US15/192,177 Active US9608828B1 (en) | 2015-10-09 | 2016-06-24 | Elongated physical unclonable function |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2020190535A1 (en) * | 2019-03-21 | 2020-09-24 | Lexmark International, Inc. | A handheld wand device and method for scanning the physical signature data of a physical unclonable function along an arbitrary path |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170100862A1 (en) | 2015-10-09 | 2017-04-13 | Lexmark International, Inc. | Injection-Molded Physical Unclonable Function |
US10527967B1 (en) | 2018-10-11 | 2020-01-07 | Lexmark International, Inc. | Toner container having a common input gear for a toner agitator assembly and an encoded member |
US11022909B2 (en) | 2018-10-11 | 2021-06-01 | Lexmark International, Inc. | Toner container having an encoded member and an alignment guide for locating a sensor relative to the encoded member |
US11022910B2 (en) | 2018-10-11 | 2021-06-01 | Lexmark International, Inc. | Sensor positioning by a replaceable unit of an image forming device |
US10527969B1 (en) | 2018-10-11 | 2020-01-07 | Lexmark International, Inc. | Drive actuation of a toner agitator assembly and an encoded member of a toner container in an electrophotographic image forming device |
USD952030S1 (en) * | 2019-10-23 | 2022-05-17 | Lexmark International, Inc. | Toner cartridge |
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US5451759A (en) * | 1993-06-24 | 1995-09-19 | Nhk Spring Co., Ltd. | Using high-permeability magnetic elements randomly scattered in the objects |
US7865722B2 (en) * | 2003-07-22 | 2011-01-04 | Agency For Science, Technology And Research | Method of identifying an object and a tag carrying identification information |
US9524456B1 (en) * | 2016-08-03 | 2016-12-20 | Lexmark International, Inc. | Manufacturing a helical physical unclonable function |
US9542576B1 (en) * | 2016-08-03 | 2017-01-10 | Lexmark International, Inc. | Magnetic helical physical unclonable function measured above flight |
-
2016
- 2016-06-24 US US15/192,177 patent/US9608828B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5451759A (en) * | 1993-06-24 | 1995-09-19 | Nhk Spring Co., Ltd. | Using high-permeability magnetic elements randomly scattered in the objects |
US7865722B2 (en) * | 2003-07-22 | 2011-01-04 | Agency For Science, Technology And Research | Method of identifying an object and a tag carrying identification information |
US9524456B1 (en) * | 2016-08-03 | 2016-12-20 | Lexmark International, Inc. | Manufacturing a helical physical unclonable function |
US9542576B1 (en) * | 2016-08-03 | 2017-01-10 | Lexmark International, Inc. | Magnetic helical physical unclonable function measured above flight |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020190535A1 (en) * | 2019-03-21 | 2020-09-24 | Lexmark International, Inc. | A handheld wand device and method for scanning the physical signature data of a physical unclonable function along an arbitrary path |
WO2020190536A1 (en) * | 2019-03-21 | 2020-09-24 | Lexmark International, Inc. | A device and method for scanning the physical signature data of a physical unclonable function with a smartphone |
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