MARTIN EDWARD HELLMAN
Pilots at Alvarado Ct, Palo Alto, CA

7865917, Jan 4, 2011

Dec 16, 2005

11/305097

Martin E Hellman - Stanford CA, US

H04N 60/33, H04N 60/32, H04N 7/167, H04N 7/173

725 14, 725 9, 725 25, 725 31, 725 94, 725 95

A broadcast system is disclosed that allows a broadcaster to provide multiple levels of subscription services. Subscribers have the option of listening to fewer (or no) commercials if they pay a higher fee, or listening to more commercials if they pay a lower (or no) fee. Commercials can be demographically targeted, cannot be skipped, and can be audited for billing purposes.

5872917, Feb 16, 1999

Oct 8, 1997

8/947053

Martin E. Hellman - Stanford CA

America Online, Inc. - Dulles VA

G06F 1100

31518801

A method is disclosed for authenticating one or both of two parties, for example, a user and a host computer. The first party and second party each know the same password. The first party sends a challenge to the second party. The second party generates and sends to the first party a response based on a first function of the password, the first party's challenge, and an extra value unknown to the first party. The first party, which knows only the length of the extra value, then attempts to match the response by using the same function, password, and challenge by cycling through the possible values for the extra value of known format. A method of bi-directional authentication may be achieved by having the first party return to the second party a response using a different function of the password, a preferably different challenge, and the extra value. The second party already knows the input values, including the extra value, and therefore, does not incur the costs associated with learning the extra value. The identity of the first party is confirmed by matching the transmitted response with a value generated locally.

4633036, Dec 30, 1986

May 31, 1984

6/615634

Martin E. Hellman - Stanford CA
Carl E. Bach - Albany CA

H04L 900

178 2211

In an encryption scheme based on the use of a public key having secret factors p and q, additional requirements on p and q are invoked in order to ensure a high level of security. In particular, it is additionally required that a value p+1 have a large prime factor r and that the value r-1 also have a large prime factor r'.

8627354, Jan 7, 2014

Dec 16, 2005

11/305379

Martin E Hellman - Stanford CA, US

H04N 7/10, H04N 7/025

725 34, 725 35

A broadcast system is disclosed that allows a broadcaster to provide multiple levels of subscription services. Subscribers have the option of listening to fewer (or no) commercials if they pay a higher fee, or listening to more commercials if they pay a lower (or no) fee. Commercials can be demographically targeted, cannot be skipped, and can be audited for billing purposes.

8401462, Mar 19, 2013

Jun 17, 2010

12/818010

Martin Edward Hellman - Stanford CA, US

H04H 40/00

455 306, 455 302, 455 63, 455 93, 455142, 700 94

A media broadcast and distribution system is disclosed which substitutes storage for communications, allowing more efficient use of scarce bandwidth resources. One embodiment allows a terrestrial FM broadcaster to offer a larger number of higher quality audio channels than current satellite radio services such as Sirius and XM Satellite Radio. This embodiment also has features that offer a better user experience than with personal audio devices such as Apple's iPod™. Another embodiment allows satellite radio services to expand their video offerings.

4658093, Apr 14, 1987

Jul 11, 1983

6/512685

Martin E. Hellman - Stanford CA

H04L 900

380 25

Software (programs, videogames, music, movies, etc. ) can be authorized for use a given number of times by a base unit after which the base unit (computer, videogame base unit, record player, videorecorder or videodisk player) cannot use that software until the manufacturer sends an authorization for additional uses to the user's base unit. Authorizations may be sent via telephone line, mail, or whatever form of communication is most suited to the application. Authorizations cannot be reused, for example by recording the telephone authorization signal and replaying it to the base unit. Similarly, authorizations can be made base unit specific, so that an authorization for one base unit cannot be transferred to another base unit. This invention also solves the "software piracy problem" and allows telephone sales of software as additional benefits.

7840178, Nov 23, 2010

Jul 11, 2006

11/484269

Martin Edward Hellman - Stanford CA, US

H04Q 7/32

455 302, 455 301, 455 304, 455 306, 4555501, 4555561, 725 63, 725 68, 725 70, 386 46, 386 95, 386126, 386124, 386125

A media broadcast and distribution system is disclosed which substitutes storage for communications, allowing more efficient use of scarce bandwidth resources. One embodiment allows a terrestrial FM broadcaster to offer a larger number of higher quality audio channels than current satellite radio services such as Sirius and XM Satellite Radio. This embodiment also has features that offer a better user experience than with personal audio devices such as Apple's iPod™. Another embodiment allows satellite radio services to expand their video offerings.

4218582, Aug 19, 1980

Oct 6, 1977

5/839939

Martin E. Hellman - Stanford CA
Ralph C. Merkle - Palo Alto CA

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

H04L 904

178 22

A cryptographic system transmits a computationally secure cryptogram that is generated from a publicly known transformation of the message sent by the transmitter; the cryptogram is again transformed by the authorized receiver using a secret reciprocal transformation to reproduce the message sent. The authorized receiver's transformation is known only by the authorized receiver and is used to generate the transmitter's transformation that is made publicly known. The publicly known transformation uses operations that are easily performed but extremely difficult to invert. It is infeasible for an unauthorized receiver to invert the publicly known transformation or duplicate the authorized receiver's secret transformation to obtain the message sent.

4200770, Apr 29, 1980

Sep 6, 1977

5/830754

Martin E. Hellman - Stanford CA
Bailey W. Diffie - Berkeley CA
Ralph C. Merkle - Palo Alto CA

Stanford University - Palo Alto CA

H04L 904

178 22

A cryptographic system transmits a computationally secure cryptogram over an insecure communication channel without prearrangement of a cipher key. A secure cipher key is generated by the conversers from transformations of exchanged transformed signals. The conversers each possess a secret signal and exchange an initial transformation of the secret signal with the other converser. The received transformation of the other converser's secret signal is again transformed with the receiving converser's secret signal to generate a secure cipher key. The transformations use non-secret operations that are easily performed but extremely difficult to invert. It is infeasible for an eavesdropper to invert the initial transformation to obtain either conversers' secret signal, or duplicate the latter transformation to obtain the secure cipher key.

8270901, Sep 18, 2012

Dec 16, 2005

11/303605

Martin E Hellman - Stanford CA, US

H04B 7/14

455 18, 725 62, 725 68, 725100, 725131, 725139, 348731

The present invention relates to media broadcast in which memory is used to reduce annoying signal dropouts. A receiver records dropout-free program material and, when a subscriber requests a particular program channel, the radio uses recorded dropout-free program material from the requested channel, only switching to the real-time broadcast, which is subject to dropouts, if the recorded dropout-free program material for the requested channel is exhausted.