中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

16 records (took 0.018 seconds)

    Pseudorandom function and the use thereof for encryption
    5.
    发明专利
    Pseudorandom function and the use thereof for encryption 未知

    公开(公告)号：SG44363A1

    公开(公告)日：1997-12-19

    申请号：SG1995002314

    申请日：1994-11-09

    Applicant: IBM

    Inventor： COPPERSMITH DON ,  ROGAWAY PHILLIP W

    IPC: G09C1/00 ,  G06F12/14 ,  G06F21/00 ,  G06F21/24 ,  H04L9/18 ,  H04L9/22

    Abstract: A software-efficient pseudorandom function maps an index and an encryption key to a pseudorandom bit string useful for constructing a stream cipher. The method begins by preprocessing the encryption key into a table of pseudorandom values. The index and a set of values from the table is then used to generate a set of initial values for the registers. At least some of the register values are modified in part by taking a current value of a register and replacing the current value with a function of the current value and a value retrieved from the table, the latter value being determined by the values in one or more other registers. After modifying the register values in this fashion, the values are masked using other values from the table and the results then concatenated into the pseudorandom bit string. The modification step is repeated and a new masked function of the register values is then concatenated into the pseudorandom bit string. The modification and concatenation steps are repeated to continue growing the pseudorandom bit string until the string reaches some desired length.

    SYSTEM AND METHOD FOR NEAR-FIELD HUMAN-BODY COUPLING FOR ENCRYPTED COMMUNICATION WITH IDENTIFICATION CARDS
    7.
    发明专利
    SYSTEM AND METHOD FOR NEAR-FIELD HUMAN-BODY COUPLING FOR ENCRYPTED COMMUNICATION WITH IDENTIFICATION CARDS 未知

    公开(公告)号：MY117650A

    公开(公告)日：2004-07-31

    申请号：MYPI9704769

    申请日：1997-10-10

    Applicant: IBM

    Inventor： COPPERSMITH DON ,  RAGHAVAN PRABHAKAR ,  ZIMMERMAN THOMAS G

    IPC: G06K19/07 ,  B60R25/00 ,  H04L9/00 ,  G06K7/08 ,  G06K17/00 ,  G06K19/04 ,  G06K19/077 ,  G06K19/10 ,  G07C9/00 ,  H04B5/00 ,  H04B5/02 ,  H04B13/00 ,  H04L9/32

    Abstract: AN APPARATUS AND METHOD ARE DISCLOSED FOR ENCODING AND TRANSFERRING DATA FROM A TRANSMITTER (5) TO A RECEIVER (7), USING THE HUMAN BODY AS A TRANSMISSION MEDIUM. THE TRANSMITTER INCLUDES AN ELECTRIC FIELD GENERATOR, A DATA ENCODER WHICH OPERATES BY MODULATING THE ELECTRIC FIELD, AND ELECTRODES (16) TO COUPLE THE ELECTRIC FIELD THROUGH THE HUMAN BODY. THE RECEIVER INCLUDES ELECTRODES (18), IN PHYSICAL CONTACT WITH, OR CLOSE PROXIMITY TO, A PART OF THE HUMAN BODY, FOR DETECTING AN ELECTRIC FIELD CARRIED THROUGH THE BODY, AND A DEMODULATOR (20) FOR EXTRACTING THE DATA FROM THE MODULATED ELECTRIC FIELD. AN AUTHENTICATOR (22), CONNECTED TO THE RECEIVER, PROCESSES THE ENCODED DATA AND VALIDATES THE AUTHENTICITY OF THE TRANSMISSION. THE APPARATUS ANDMETHOD ARE USED TO IDENTIFY AND AUTHORIZE A POSSESSOR (32) OF THE TRANSMITTER. THE POSSESSOR THEN HAS SECURE ACCESS TO, AND CAN OBTAIN DELIVERY OF, GOODS AND SERVICES SUCH AS THE DISTRIBUTION OF MONEY, PHONE PRIVILEGES, BUILDING ACCESS, AND COMMODITIES. ENCRYPTION PROVIDES RAPID TRANSMISSION AND AUTHENTICATION OF THE TRANSMITTER, AND A PLURALITY OF SIMILAR TRANSMITTERS, WITH MINIMUM VULNERABILITY TO COUNTERFEIT. SIGNAL PROCESSING AND DIGITAL COMMUNICATION COMPONENTS ACCOMMODATE VARIATIONS IN LOCATION AND ORIENTATION OF THE TRANSMITTER AND RECEIVER, AND PROVIDE TRANSMITTERS WITH LONG LIFE TIMES AND HIGH RELIABILITY. (FIGURE 1)

    8.
    发明专利
    未知

    公开(公告)号：DE69431390T2

    公开(公告)日：2003-06-05

    申请号：DE69431390

    申请日：1994-11-09

    Applicant: IBM

    Inventor： COPPERSMITH DON ,  ROGAWAY PHILLIP W

    IPC: G09C1/00 ,  G06F12/14 ,  G06F21/00 ,  G06F21/24 ,  H04L9/18 ,  H04L9/22

    Abstract: A software-efficient pseudorandom function maps an index and an encryption key to a pseudorandom bit string useful for constructing a stream cipher. The method begins by preprocessing the encryption key into a table of pseudorandom values. The index and a set of values from the table is then used to generate a set of initial values for the registers. At least some of the register values are modified in part by taking a current value of a register and replacing the current value with a function of the current value and a value retrieved from the table, the latter value being determined by the values in one or more other registers. After modifying the register values in this fashion, the values are masked using other values from the table and the results then concatenated into the pseudorandom bit string. The modification step is repeated and a new masked function of the register values is then concatenated into the pseudorandom bit string. The modification and concatenation steps are repeated to continue growing the pseudorandom bit string until the string reaches some desired length.

    9.
    发明专利
    未知

    公开(公告)号：ES2189926T3

    公开(公告)日：2003-07-16

    申请号：ES97307541

    申请日：1997-09-25

    Applicant: IBM

    Inventor： COPPERSMITH DON ,  RAGHAVAN PRABHAKAR ,  ZIMMERMAN THOMAS G

    IPC: G06K19/07 ,  B60R25/00 ,  G06K7/08 ,  G06K17/00 ,  G06K19/04 ,  G06K19/077 ,  G06K19/10 ,  G07C9/00 ,  H04B5/00 ,  H04B5/02 ,  H04B13/00 ,  H04L9/32

    Abstract: An apparatus and method are disclosed for encoding and transferring data from a transmitter to a receiver, using the human body as a transmission medium. The transmitter includes an electric field generator, a data encoder which operates by modulating the electric field, and electrodes to couple the electric field through the human body. The receiver includes electrodes, in physical contact with, or close proximity to, a part of the human body, for detecting an electric field carried through the body, and a demodulator for extracting the data from the modulated electric field. An authenticator, connected to the receiver, processes the encoded data and validates the authenticity of the transmission. The apparatus and method are used to identify and authorize a possessor of the transmitter. The possessor then has secure access to, and can obtain delivery of, goods and services such as the distribution of money, phone privileges, building access, and commodities. Encryption provides rapid transmission and authentication of the transmitter, and a plurality of similar transmitters, with minimum vulnerability to counterfeit. Signal processing and digital communication components accommodate variations in location and orientation of the transmitter and receiver, and provide transmitters with long life times and high reliability.

    10.
    发明专利
    未知

    公开(公告)号：DE69719919D1

    公开(公告)日：2003-04-24

    申请号：DE69719919

    申请日：1997-09-25

    Applicant: IBM

    Inventor： COPPERSMITH DON ,  RAGHAVAN PRABHAKAR ,  ZIMMERMAN THOMAS G

    IPC: G06K19/07 ,  B60R25/00 ,  G06K7/08 ,  G06K17/00 ,  G06K19/04 ,  G06K19/077 ,  G06K19/10 ,  G07C9/00 ,  H04B5/00 ,  H04B5/02 ,  H04B13/00 ,  H04L9/32

    Abstract: An apparatus and method are disclosed for encoding and transferring data from a transmitter to a receiver, using the human body as a transmission medium. The transmitter includes an electric field generator, a data encoder which operates by modulating the electric field, and electrodes to couple the electric field through the human body. The receiver includes electrodes, in physical contact with, or close proximity to, a part of the human body, for detecting an electric field carried through the body, and a demodulator for extracting the data from the modulated electric field. An authenticator, connected to the receiver, processes the encoded data and validates the authenticity of the transmission. The apparatus and method are used to identify and authorize a possessor of the transmitter. The possessor then has secure access to, and can obtain delivery of, goods and services such as the distribution of money, phone privileges, building access, and commodities. Encryption provides rapid transmission and authentication of the transmitter, and a plurality of similar transmitters, with minimum vulnerability to counterfeit. Signal processing and digital communication components accommodate variations in location and orientation of the transmitter and receiver, and provide transmitters with long life times and high reliability.

Patent Agency Ranking