Patent application number | Description | Published |
20150280924 | REISSUE OF CRYPTOGRAPHIC CREDENTIALS - Effecting reissue in a data processing system of a cryptographic credential certifying a set of attributes, the credential being initially bound to a first secret key stored in a first processing device. A backup token is produced using the first device and comprises a commitment to said set of attributes and first proof data permitting verification that the set of attributes in said commitment corresponds to the set of attributes certified by said credential. At a second processing device, a second secret key is stored and blinded to produce a blinded key. A credential template token produced from the backup token and the blinded key is sent to a credential issuer where said verification is performed using the first proof data and the credential template token is used to provide a reissued credential, certifying said set of attributes, to the second device, the reissued credential being bound to the second secret key. | 10-01-2015 |
20150332064 | MANAGING UNLINKABLE IDENTIFIERS FOR CONTROLLED PRIVACY-FRIENDLY DATA EXCHANGE - A method for managing unlinkable database user identifiers includes distributing to a first database a first encrypted user identifier, a first database identifier, and a first database user identifier; distributing to a second database a second encrypted user identifier, a second database identifier, and a second database user identifier; receiving from the first database a third encryption and a fourth encryption, the third encryption being formed from the first encrypted user identifier, the second database identifier, and a message comprised in the fourth encryption; decrypting the third encryption thereby obtaining a decrypted value; deriving a blinded user identifier from the decrypted value; and sending the encrypted blinded user identifier and the fourth encrypted value to the second server thereby enabling the second server to compute the second database user identifier from the encrypted blinded database user identifier and the decrypted fourth encrypted value. | 11-19-2015 |
20150341173 | PASSWORD-BASED AUTHENTICATION - A password authentication system includes an access control server configured to control access by a user computer to a resource dependent on authentication of user passwords associated with user IDs. The system further includes a plurality of authentication servers, storing respective secret values. For each user ID, the access control server stores a first ciphertext produced by encrypting the user password associated with that ID using a predetermined algorithm dependent on the secret values. In response to receipt of a user ID and an input password, the access control server communicates with the plurality of authentication servers to implement password authentication, requiring use of the secret values, in which a second ciphertext is produced by encrypting the input password using said predetermined algorithm. The access control server compares the first and second ciphertexts to determine whether the input password equals the user password to permit access to the resource. | 11-26-2015 |
20150341335 | PASSWORD-BASED AUTHENTICATION - A password authentication system includes an access control server configured to control access by a user computer to a resource dependent on authentication of user passwords associated with user IDs. The system further includes a plurality of authentication servers, storing respective secret values. For each user ID, the access control server stores a first ciphertext produced by encrypting the user password associated with that ID using a predetermined algorithm dependent on the secret values. In response to receipt of a user ID and an input password, the access control server communicates with the plurality of authentication servers to implement password authentication, requiring use of the secret values, in which a second ciphertext is produced by encrypting the input password using said predetermined algorithm. The access control server compares the first and second ciphertexts to determine whether the input password equals the user password to permit access to the resource. | 11-26-2015 |
20160065366 | Password-Based Generation and Management of Secret Cryptographic Keys - Methods and apparatus are provided for generating a secret cryptographic key of a user computer connectable to a server via a network. A secret user value is provided at the user computer. A secret server value is provided at the server with a check value which encodes the secret user value and a user password. The user computer encodes the secret user value and an input password to produce a first value corresponding to said check value, and communicates the first value to the server. The server compares the first and the check values to check whether the input password equals the user password. If so, the server encodes the first and the secret server values to produce a second value and communicates the second value to the user computer. The user computer generates the secret cryptographic key by encoding the second value, the input password and the secret user value. | 03-03-2016 |
20160094540 | Distributed Single Sign-On - Methods and apparatus are provided for authenticating user computers | 03-31-2016 |
Patent application number | Description | Published |
20140359289 | METHOD FOR DERIVING A VERIFICATION TOKEN FROM A CREDENTIAL - A method for deriving a verification token from a credential may be provided. The credential may be a set of attributes certified by an issuer to a user using a public key of the issuer. The method may comprise generating the verification token out of the credential and binding the verification token to a context string, wherein the verification token may comprise at least one commitment. A commitment may be a blinded version of an attribute. The method may also comprise generating an opening key for the verification token enabling a generation of a confirmation for a validity of the attribute. | 12-04-2014 |
20150280923 | PRODUCTION OF CRYPTOGRAPHIC SIGNATURES - A method and system configured to produce a cryptographic signature on a message, under a key, at a user computer wherein the key is shared between the user computer, which stores a first key-share, and an authentication computer, which stores a second key-share and a first authentication value. The user computer encodes the message to produce a blinded message, produces the first authentication value from a user password and a secret value, and produces a second authentication value by encoding the first authentication value and a nonce. The authentication computer uses the nonce to determine if the first authentication value is correct and, if so, encodes the blinded message using the second key-share to produce a partial signature. The user computer produces a signature on the message under the key by encoding the partial signature and the message using the first key-share and an unblinding function. | 10-01-2015 |
20150288525 | PRODUCTION OF CRYPTOGRAPHIC SIGNATURES - A method and system configured to produce a cryptographic signature on a message, under a key, at a user computer wherein the key is shared between the user computer, which stores a first key-share, and an authentication computer, which stores a second key-share and a first authentication value. The user computer encodes the message to produce a blinded message, produces the first authentication value from a user password and a secret value, and produces a second authentication value by encoding the first authentication value and a nonce. The authentication computer uses the nonce to determine if the first authentication value is correct and, if so, encodes the blinded message using the second key-share to produce a partial signature. The user computer produces a signature on the message under the key by encoding the partial signature and the message using the first key-share and an unblinding function. | 10-08-2015 |
20150381373 | BACKUP AND INVALIDATION OF AUTHENTICATION CREDENTIALS - A method for a re-issuance of an attribute-based credential of an issuer of the attribute-based credential for a user may be provided. The user is holding backup values derived from a first credential previously obtained from the issuer, wherein the first credential is built using at least a first value of at least one authentication pair. The method comprises receiving by the issuer from the user a set of values derived from the backup values comprising a second value of the at least one authentication pair, validating by the issuer that the second value is a valid authentication answer with respect to the first value and whether the set of values was derived from a valid first credential, and providing by the issuer a second credential to the user based on the first set of values. | 12-31-2015 |
Patent application number | Description | Published |
20080202030 | Suspension Device and Running Carriage for a Sliding Door that Seals - The invention relates to a suspension device for at least one sliding door for closing a door opening or window opening. In this suspension device, the sliding door is displaceably mounted by two rollers that roll on at least one roll profile, and when entering the closing area, the sliding door is both displaced in the direction of the door opening as well as lowered. The rollers are arranged in an essentially vertical manner in a position outside of the closing area, and; the rollers, when entering the closing area, laterally tilt out of the vertical. The sliding door, in a pivotal motion about a horizontal axis, which is parallel to the plane of the sliding door, is displaced in the direction of the door opening and lowered. | 08-28-2008 |
20100266800 | Method for Fastening a Plate or Glass Panel in a Frame Element and Sealing Element for Use in Such a Method - The invention relates to a novel method for fastening at least one plate, such as a glass panel, in a profile, which has an assembly groove for peripherally receiving an edge of the glass panel. The method is characterized in that on at least one of the glass panels and an inside of the assembly groove oriented parallel thereto an assembly rubber seal is disposed, on the surface of which facing the glass panel a double-sided adhesive tape having a cover film that covers the side of the double-sided adhesive tape facing the glass panel is attached, wherein the glass panel is inserted into the assembly groove and is pressed against the double-sided adhesive tape in the assembly groove by at least one counter element disposed on the opposite side of the glass panel, or by the opposite inside of the assembly groove, and wherein the cover film is removed when the glass panel is inserted into the assembly groove. | 10-21-2010 |
Patent application number | Description | Published |
20080215053 | Prevention of re-use of a medical device - A disposable medical device is especially an articulation for the relative positioning of fixation bars or of pins of an external fixator, having at least a clamping means to be introduced into the medical device, the clamping means comprises an element that alters its appearance when being heated over a threshold temperature, thus giving optical or mechanical information that the device should not be used a second time. | 09-04-2008 |
20090264883 | Radiolucent orthopedic fixation plate - An orthopedic fixation plate comprises a plurality of cylindrical holes for attaching connectors of a external fixation system, wherein the fixation plate comprises two supporting elements around each orifice of a cylindrical hole wherein the supporting elements are connected with a sleeve and said supporting elements are also connected with a longitudinally oriented ring element arranged in a radial distance of said sleeve. | 10-22-2009 |
20120184958 | BOLT AND TOOL WITH ANTI-TORQUE FEATURES - A system for fixing a wire to a surface of an external fixator having a wire adapted to extend through bony structure fastened with respect to the surface. A bolt having a shaft which comprises a threaded section, a head section and at least one clamping element is provided wherein the bolt is adapted to extend through an opening in the external fixation element with a nut, and clamps the wire to the surface. A counter torque tool is used to provide a counter torque while fastening the wire with the bolt and the nut. The bolt comprises a counter torque opening and wherein the counter torque tool comprises a section which is adapted to engage into the counter torque opening of the bolt to apply the counter torque. | 07-19-2012 |
20130006244 | EXTERNAL FIXATOR ELEMENT - A polymeric external fixator element, such as a rod or a pin or a clamp, has at least one contacting surface. At least one of the contacting surfaces of the element responsible to establish connection between the element and a different external fixator element is provided with a rough ablated structure. The clamping can be improved if one of the polymeric elements comprise fibers having fiber parts protruding above the surface. | 01-03-2013 |
20130158551 | PREVENTION OF RE-USE OF A MEDICAL DEVICE - A disposable medical device is especially an articulation for the relative positioning of fixation bars or of pins of an external fixator, having at least a clamping means to be introduced into the medical device, the clamping means comprises an element that alters its appearance when being heated over a threshold temperature, thus giving optical or mechanical information that the device should not be used a second time. | 06-20-2013 |
20130165930 | BOLT AND TOOL WITH ANTI-TORQUE FEATURES - A system for fixing a wire to a surface of an external fixator having a wire adapted to extend through bony structure fastened with respect to the surface. A bolt having a shaft which comprises a threaded section, a head section and at least one clamping element is provided wherein the bolt is adapted to extend through an opening in the external fixation element with a nut, and clamps the wire to the surface. A counter torque tool is used to provide a counter torque while fastening the wire with the bolt and the nut. The bolt comprises a counter torque opening and wherein the counter torque tool comprises a section which is adapted to engage into the counter torque opening of the bolt to apply the counter torque. | 06-27-2013 |
20150080892 | TELESCOPIC STRUT FOR AN EXTERNAL FIXATOR - A telescopic strut for use with an external fixator comprising an axially extending rod; an axially extending tube moveably recurring the rod for varying the length of the rod and tube combination along a longitudinal axis; the tube having first and second ends, the second end having a pin extending therethrough; a locking system mounted on the tube first end for adjusting the position of the rod in the tube and fixing the length of the rod and tube combination; a coupling element having a tubular sleeve with a threaded outer surface mounted on an outer surface of the second end of the tube, the sleeve having two diametrically opposed slots receiving the pin and an adjustment element threadably mounted on the sleeve outer surface for axial movement along the axis, the adjustment element having a surface contacting the pin to limit the movement of the pin in the slots. | 03-19-2015 |
Patent application number | Description | Published |
20090194708 | UV-DOSIS INDICATORS - The present application provides a composition showing a color change depending on the absorbed radiation-dose, comprising (a) an acid responsive colorant; (b) a photolatent acid; characterized in that (b) is a sulfonyloxime ester compound; and its use as a radiation dose indicator. | 08-06-2009 |
20100021833 | DITHIOLENE METAL COMPLEX COLORLESS IR ABSORBERS - The invention relates to the use of compounds of formulae (I) and/or (II) as colorless IR absorbers wherein M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti, X | 01-28-2010 |
20100310787 | USE OF ZERO-ORDER DIFFRACTIVE PIGMENTS - The invention relates to the use of tungsten oxide or of tungstate to increase the heat-input amount of near infrared radiation in processes selected from laser welding of plastics, NIR curing of coatings, drying of printing inks, fixing of ink toners to a substrate, heating of plastic preforms, laser marking of plastics or paper. | 12-09-2010 |
20110248225 | POTASSIUM CESIUM TUNGSTEN BRONZE PARTICLES - Disclosed are potassium cesium tungsten bronze solid solution particles of the formula K | 10-13-2011 |
20120129090 | HEAT ABSORBING ADDITIVES - The invention relates to a powder composition comprising particles of a) an alkali metal tungsten bronze, b) tungsten oxide, and c) tungsten metal, a method for the preparation of said powder composition, and to the use of said powder composition in form of a dispersion in a polymer material or article for heat shielding, or to increase the heat-input amount of near infrared radiation in processes selected from laser welding of plastics, NIR curing of coatings, drying of printing inks, fixing of ink toners to a substrate, heating of plastic performs, laser marking of plastics or paper. | 05-24-2012 |
20120229884 | CHARGED PARTICLES - Disclosed is a composition comprising a charged particle of volume 5 nm | 09-13-2012 |
20130092874 | BLACK DICHROIC DYE - Described is a black dichroic dye composition comprising 2 or more dyes, wherein at least one dye, generally a red dye and optionally a yellow dye, conforms to the formula A and at least one dye, usually a blue dye, conforms to the formula B Ar | 04-18-2013 |
20130234427 | THE USE OF ARYL OR HETEROARYL SUBSTITUTED DITHIOLENE METAL COMPLEXES AS IR ABSORBERS - The present invention relates to the use of specific metal complexes of dithiolenes with aryl or heteroarylsubstituted imidazolidine-2-chalcogenone-4,5-dithione ligands as colourless IR absorbers. | 09-12-2013 |
20140103635 | CHROMOPHORES WITH PERFLUOROALKYL SUBSTITUENTS - The present invention relates to specific metal complexes of dithiolenes with perfluoroalkyl substituted imidazolidine-2-chalcogenone-4,5-dithione ligands, a process for their preparation and their use as colourless IR absorbers, for optical filters application; especially for plasma display panels, or for laser welding of plastics. The compounds may be used in compositions for inks, paints and plastics, especially in a wide variety of printing systems and are particularly well-suited for security applications. | 04-17-2014 |