Patents by Inventor Susan R. Hohenberger

Susan R. Hohenberger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Unidirectional proxy re-encryption
    Patent number: 8094810
    Abstract: A method for performing unidirectional proxy re-encryption includes generating a first key pair comprising a public key (pk) and a secret key (sk) and generating a re-encryption key that changes encryptions under a first public key pka into encryptions under a second public key pkb as rkA?B. The method further includes performing one of the group consisting of encrypting a message m under public key pka producing a ciphertext ca, re-encrypting a ciphertext ca using the re-encryption key rkA?B that changes ciphertexts under pka into ciphertexts under pkb to produce a ciphertext cb under pkb, and decrypting a ciphertext ca under pka to recover a message m. The method also includes encrypting a message m under a public key pk producing a first-level ciphertext c1 that cannot be re-encrypted, and decrypting a first-level ciphertext c1 using secret key sk.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: January 10, 2012
    Assignees: Massachusetts Institute of Technology, The Johns Hopkins University
    Inventors: Susan R. Hohenberger, Kevin Fu, Giuseppe Ateniese, Matthew Green
  • Method for automatically validating a transaction, electronic payment system and computer program
    Patent number: 8051010
    Abstract: A method, system and computer program product relating to automatically validating a transaction between an issuer having a signing key, an emitter having an emitter key, an acceptor having a unique identity and a limit on transactions and a validator.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: November 1, 2011
    Assignee: International Business Machines Corporation
    Inventors: Jan L. Camenisch, Susan R. Hohenberger
  • Unidirectional proxy re-encryption
    Publication number: 20080059787
    Abstract: A method for performing unidirectional proxy re-encryption includes generating a first key pair comprising a public key (pk) and a secret key (sk) and generating a re-encryption key that changes encryptions under a first public key pka into encryptions under a second public key pkb as rkA?B. The method further includes performing one of the group consisting of encrypting a message m under public key pka producing a ciphertext ca, re-encrypting a ciphertext ca using the re-encryption key rkA?B that changes ciphertexts under pka into ciphertexts under pkb to produce a ciphertext cb under pkb, and decrypting a ciphertext ca under pka to recover a message m. The method also includes encrypting a message m under a public key pk producing a first-level ciphertext c1 that cannot be re-encrypted, and decrypting a first-level ciphertext c1 using secret key sk.
    Type: Application
    Filed: February 3, 2006
    Publication date: March 6, 2008
    Inventors: Susan R. Hohenberger, Kevin Fu, Giuseppe Ateniese, Matthew Green