Digital signature protocol
October 10, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSystem for printing encrypted messages with a character generator and bar-code representation System for printing encrypted messages with bar-code representation Postage payment system where accounting for postage payment occurs at a time subsequent to the printing of the postage and employing a visual marking imprinted on the mailpiece to show that accounting has occurred Digital signature system and method based on a conventional encryption function Undeniable signature systems Method for electronic transaction with digital signature Method for allocating useful data to a specific originator Verification method and apparatus Method of privacy communication using elliptic curves Method for generating and verifying electronic signatures and privacy communication using elliptic curves InventorAssigneeApplicationNo. 949030 filed on 10/10/1997US Classes:380/282, By public key method380/45, Multiple key level380/281, Using master key (e.g., key-encrypting-key)380/283, User-to-user key distributed over data link (i.e., no center)380/285, By public key method713/176, Authentication by digital signature representation or digital watermark713/177, Signature tree713/180Generating specific digital signature type (e.g., blind, shared, or undeniable)ExaminersPrimary: Swann, Tod R.Assistant: Callahan, Paul E. Attorney, Agent or FirmForeign Patent References
International ClassH04L 009/00Foreign Application Priority Data1996-10-11 GBAbstractA digital signature protocol generates a signature component using a hash of an encrypted message. The component and encrypted message form a signature pair that is forwarded to a recipient. The encryption message is used to retrieve the encryption key at the recipient and authenticate information in the message. The signature pair may be applied to a data carrier as a bar code for use in mail delivery services. By utilizing a hash of the message, a reduced message length is achieved as individual signatures are not required for each component of the message.Other References
Field of SearchPublic keyKey sequence signal combined with data signal Having production of printed copy (e.g., printer, typewriter) FACSIMILE CRYPTOGRAPHY Including generation of an associated coded record COMMUNICATION SYSTEM USING CRYPTOGRAPHY Position dependent or authenticating Symmetric key cryptography Symmetric key synchronization Transmitting a seed, sequence, or initial value By public key method User-to-user key distributed over data link (i.e., no center) Using master key (e.g., key-encrypting-key) PARTICULAR ALGORITHMIC FUNCTION ENCODING Postage metering system Including authentication Particular communication authentication technique Mutual entity authentication Authentication of an entity and a message Having key exchange Authentication by digital signature representation or digital watermark Signature tree Including generation of associated coded record Generating specific digital signature type (e.g., blind, shared, or undeniable) |
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