12 results about "Digital signature" patented technology

An e-mail server device includes a certificate storage unit, an SMTP reception unit, a signature unit, an SMTP transmission unit, a validity determination unit and an update request e-mail generating unit. The certificate storage unit stores a certificate for each account. The SMTP reception unit receives e-mail. The signature unit assigns a digital signature to the e-mail received by the SMTP reception unit by using a certificate of an account of a transmitter. The SMTP transmission unit transfers the e-mail assigned with the digital signature. The validity determination unit determines whether or not the certificate stored in the certificate storage unit is necessary to be updated. When the validity determination unit determines that the certificate is necessary to be updated, the update request e-mail generating unit transmits update request e-mail to the account for requesting an update of the certificate.

The present invention relates to the field of anti-counterfeit protection of products. Specifically, the invention is directed to a composite security marking for a physical object, in particular to an anti-counterfeit product marking. In particular, without limitation, such composite security marking can be used in connection with or can form a component of a multi-component security system, in particular of an anti-counterfeit protection system, which is also disclosed herein as part of an overall solution for anti-counterfeit protection. The composite security marking comprises a physical unclonable function, PUF, and a representation of a digital signature or of a pointer indicating a location where said digital signature can be accessed. The digital signature digitally signs a hash value resulting from application of a predetermined cryptographic hash function to data representing a response generated by the PUF in reaction to a challenge of a predetermined challenge-response authentication scheme.

The invention provides a reusable public key certificate scheme based on a public key infrastructure. The scheme comprises the steps: (1) an applicant submits a user main public key and relevant information of the applicant to a certificate authority, and the certificate authority issues a signed user main public key certificate after the certification passes; (2) the applicant automatically generates an application user public key for a specific application and application public key verification information; (3) a message sender verifies the ownership of the application user public key, and if the ownership is verified to be the applicant, the message sender performs relevant public key password operation by using the application user public key; and (4) the applicant decrypts the received encrypted message using the application user public key, or performs digital signature using a private key corresponding to the application user public key. The public key password system is very convenient to use, is high in security, and greatly improves the working efficiency of the certificate authority (CA) in the public key infrastructure.

A method for a network infrastructure copy protection system. The method includes the step of applying a digital signature to a digital content file prior to transmission. Digital content files that are to be legitimately transmitted across the distributed computer network are modified by the application of digital signatures corresponding to the sender. As content files are transmitted across a distributed computer network, the distributed computer network examines the content files to determine whether they include the digital signatures. The examining is performed by hardware comprising the infrastructure of the distributed computer network. When content files include respective digital signatures, the content files are transmitted by the infrastructure. When the content files do not include the digital signatures, transmission of those content files not having digital signatures is blocked. The digital signatures are configured to identify the senders of the digital content files. The digital signatures can be logged within the distributed computer network to maintain a record of the digital content files as they are transmitted. The hardware performing the examining can be a plurality of routers or a plurality of cache engines within the distributed computer network.

A positional information storage system stores and verifies positional information of a mobile terminal apparatus. The positional information storage system stores (i) the positional information, (ii) time information, and (iii) signature data that is generated by placing a digital signature on a combination of the time information and the positional information of the mobile terminal apparatus only if a user of the mobile terminal apparatus is successfully authenticated. The positional information storage system also verifies whether the signature data is authentic. With this construction, it is possible to authenticate a person carrying the mobile terminal apparatus, and to verify whether data to be stored in the memory has been tampered with.

A method and system for providing makeup consultation using a computing device. The steps of providing a makeup consultation method using a computing device are as follows: in a computing device utilized by a makeup professional providing makeup consultation, makeup professional credentials are obtained from the makeup professional, the makeup professional credentials being used to retrieve contact information for the makeup professional; the computing device obtains selections of cosmetic products and product information for each of the selected cosmetic product; the computing device generates a digital signature based on the makeup professional credentials and the selected cosmetic products, wherein the digital signature includes the contact information for the makeup professional and product information for each of the selected cosmetic products; and the computing device grants access to the digital signature by a client device utilized by a user receiving a makeup consultation fromthe makeup professional.

Methods and apparati for auditing uses of audited cryptographic keys. In a method embodiment of the present invention, a set of audited uses for an audited cryptographic key is defined; the key is used inside a protected execution environment of a digital computer; a digitally signed audit record describing an instance of use of the audited cryptographic key is released for each audited use of the audited cryptographic key; a signed receipt of digitally signed audit records is received from an auditor; a digital signature of the signed receipt of the auditor is verified inside the protected execution environment using a public verification key of the auditor; the set of audit records that have not been verified by the auditor is determined; a set of allowable conditions for the set of non-verified audit records is stored; and the protected execution environment is prevented from outputting the results of an instance of an audited use of the audited cryptographic key when the set of non-verified audit records does not meet all of the conditions in the set of allowable conditions.