Patents by Inventor A. A. Jithra Adikari

A. A. Jithra Adikari 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).

  • Patent number: 11251973
    Abstract: A computer system module(s) substitutes a double scalar multiplication, used for signature verification in an encryption/decryption system, for two single scalar multiplications. The modules verify a group equation defined by [S]B=R+[k]A? of the encryption/decryption system, where S is an integer characterized by the signature, K is an integer generated by a message being encrypted, B is a base point on the elliptic curve, R is a point on the elliptic curve and characterized by the signature, and A? is a public key. The modules optionally rearrange the group equation to [S]B+[?k]A?=R, and convert it to [S]B+[n?k]A?=R, where n is the order of the base point. The modules determine a joint sparse form for the integers S and n?k and apply the Shamir's algorithm to the joint sparse form to verify the group equation.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: February 15, 2022
    Assignee: Synopsys, Inc.
    Inventor: Jithra Adikari
  • Patent number: 10541979
    Abstract: A method for ciphering protected content communicated between a first device and a plurality of devices over a plurality of channels comprises performing authentication between the first device and each of the plurality of devices to create two or more shared key and initialization vector pairs allowing the ciphering of the protected content; generating a key stream for each of the channels based on a selected one of the two or more of shared key and initialization vector pairs; maintaining a buffer for each channel, each of the buffer containing the key stream generated for the corresponding channel; and ciphering data incoming on a selected channel using the selected key stream from the buffer corresponding to the selected channel.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: January 21, 2020
    Assignee: Synopsys, Inc.
    Inventors: Neil Farquhar Hamilton, Michael James Lewis, Michael Borza, Andrew A. Elias, A. A. Jithra Adikari
  • Patent number: 9900149
    Abstract: A method of improving the efficiency of an encryption/decryption process implementing the NIST FIPS 197 standard which includes a substitution box (S-box) and an inverse substitution (inverse S-box), comprises concatenating the S-box and inverse S-box to form a combined lookup table, and folding the concatenated table to generate a folded lookup table. The folded lookup table may be indexed for an encryption operation and for a decryption operation using a signal indicative of whether encryption or decryption is used.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: February 20, 2018
    Assignee: Synopsys, Inc.
    Inventors: A. A. Jithra Adikari, Michael Borza
  • Patent number: 9852312
    Abstract: A secure generic encryption system for nonsecure datapaths comprises a format-specific adaptation layer/data path for receiving and processing nonsecure content data; an authentication engine located within a security perimeter and coupled to an external communication interface for authentication and supplying the format-specific adaptation layer/data path, located outside the security perimeter, with an output signal indicating whether authentication is successful; and a generic encryption module located within the security perimeter and coupled (1) to the authentication engine for receiving from the authentication engine initialization vectors, encryption keys, and the output signal indicating whether authentication is successful, and (2) to the format-specific adaptation layer/data path for (a) receiving a read signal from the format-specific adaptation layer/data path, and (b) providing the format-specific adaptation layer/data path with a data-available signal to indicate whether data is available to be
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: December 26, 2017
    Assignee: Synopsys, Inc.
    Inventors: Jean-Pierre Thibault, A. A. Jithra Adikari
  • Patent number: 9794623
    Abstract: A method for determining the color depths of the video data for a selected frame in High-bandwidth Digital Content Protection (HDCP) video data transmitted over a High Definition Multimedia Interface (HDMI), in which (a) the beginning of the selected frame is marked with a vertical synchronization (VSYNC) signal and (b) a mark in a window of opportunity (WOO) for the selected frame indicates whether or not that frame is encrypted. The method detects, for the selected frame, the length of the interval between a VSYNC signal and the location of at least one of (i) the start of the corresponding WOO and (ii) the mark indicating whether or not the selected frame is encrypted, and then determines the color depth of the video data for the selected frame based on the detected length.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: October 17, 2017
    Assignee: Synopsys, Inc.
    Inventors: A. A. Jithra Adikari, Andrew Alexander Elias, Neil Leckett
  • Patent number: 9742438
    Abstract: An embodiment of a method and apparatus for ciphering data. Data is provided for ciphering. The data is ciphered in a plurality of steps. For each step, determining an encoding for error detection of the data being processed within the step. Determining an output error detection encoding for the step. Processing data of the round to provide output error detection encoding. Then, verifying the encoding against a determined output error detection encoding. If the output error detection encoding is not the same as the determined error detection encoding, providing a signal indicating the presence of an error within the cipher process.
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: August 22, 2017
    Assignee: Synopsys, Inc.
    Inventors: A. A. Jithra Adikari, Jean-Pierre Thibault, Mike Borza
  • Patent number: 9571473
    Abstract: An HDCP receiver device that receives frames from an HDCP transmitter device. The receiver device has a frame counter that is updated for each frame that is received from the transmitter device and that includes encrypted content, while the receiver device is in a pre-authorization mode. During the pre-authorization mode, the receiver device does not decrypt any received frame bearing encrypted content. While the receiver device waits to transition from the pre-authorization mode to a post-authorization mode in which the receiver device can begin to decrypt any received frames that include encrypted content, the frame counter is updated for each frame received that includes encrypted content. In the post-authorization mode, the frame counter has a nonzero value if frames including encrypted content were received by the receiver device during the pre-authorization mode.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: February 14, 2017
    Assignee: Synopsys, Inc.
    Inventors: Andrew A. Elias, A.A. Jithra Adikari
  • Publication number: 20160344409
    Abstract: An embodiment of a method and apparatus for ciphering data. Data is provided for ciphering. The data is ciphered in a plurality of steps. For each step, determining an encoding for error detection of the data being processed within the step. Determining an output error detection encoding for the step. Processing data of the round to provide output error detection encoding. Then, verifying the encoding against a determined output error detection encoding. If the output error detection encoding is not the same as the determined error detection encoding, providing a signal indicating the presence of an error within the cipher process.
    Type: Application
    Filed: August 5, 2016
    Publication date: November 24, 2016
    Inventors: A.A. Jithra Adikari, Jean-Pierre Thibault, Mike Borza
  • Publication number: 20160344551
    Abstract: A method of improving the efficiency of an encryption/decryption process implementing the NIST FIPS 197 standard which includes a substitution box (S-box) and an inverse substitution (inverse S-box), comprises concatenating the S-box and inverse S-box to form a combined lookup table, and folding the concatenated table to generate a folded lookup table. The folded lookup table may be indexed for an encryption operation and for a decryption operation using a signal indicative of whether encryption or decryption is used.
    Type: Application
    Filed: August 14, 2014
    Publication date: November 24, 2016
    Inventors: A.A. Jithra Adikari, Michael Borza
  • Publication number: 20160241386
    Abstract: A method for ciphering protected content communicated between a first device and a plurality of devices over a plurality of channels comprises performing authentication between the first device and each of the plurality of devices to create two or more shared key and initialization vector pairs allowing the ciphering of the protected content; generating a key stream for each of the channels based on a selected one of the two or more of shared key and initialization vector pairs; maintaining a buffer for each channel, each of the buffer containing the key stream generated for the corresponding channel; and ciphering data incoming on a selected channel using the selected key stream from the buffer corresponding to the selected channel.
    Type: Application
    Filed: February 17, 2015
    Publication date: August 18, 2016
    Inventors: Neil Farquhar Hamilton, Michael James Lewis, Michael Borza, Andrew A. Elias, A.A. Jithra Adikari
  • Patent number: 9417951
    Abstract: What is disclosed is an embodiment of a method for ciphering data. Data is provided for ciphering thereof. The data is ciphered in a plurality of steps. For each step, an encoding for error detection of the data for being processed within the step is determined. An output error detection encoding for the step is determined. The data for being processed within the round is processed to provide output error detection encoding which is then verified against the determined output error detection encoding. When the output error detection encoding is other than same as the determined error detection encoding, providing a signal indicative of an error within the cipher process.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: August 16, 2016
    Assignee: Synopsys, Inc.
    Inventors: A. A. Jithra Adikari, Jean-Pierre Thibault, Mike Borza
  • Publication number: 20160085993
    Abstract: A secure generic encryption system for nonsecure datapaths comprises a format-specific adaptation layer/data path for receiving and processing nonsecure content data; an authentication engine located within a security perimeter and coupled to an external communication interface for authentication and supplying the format-specific adaptation layer/data path, located outside the security perimeter, with an output signal indicating whether authentication is successful; and a generic encryption module located within the security perimeter and coupled (1) to the authentication engine for receiving from the authentication engine initialization vectors, encryption keys, and the output signal indicating whether authentication is successful, and (2) to the format-specific adaptation layer/data path for (a) receiving a read signal from the format-specific adaptation layer/data path, and (b) providing the format-specific adaptation layer/data path with a data-available signal to indicate whether data is available to be
    Type: Application
    Filed: September 18, 2014
    Publication date: March 24, 2016
    Inventors: Jean-Pierre Thibault, A.A. Jithra Adikari
  • Patent number: 9264229
    Abstract: A method for performing a cryptographic function on text to generate converted text comprises producing a random key stream having a first block size in a first frequency domain; converting the random key stream having a first block size in the first frequency domain to a random key stream in a second frequency domain; converting the random key stream having the first block size in the second frequency domain into smaller block sizes, thereby producing smaller block-sized random key stream of the second frequency domain; and converting the text using the smaller block-sized random key stream of the second frequency domain to produce the converted text. The frequency in the first frequency domain is preferably lower than the frequency in the second frequency domain.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: February 16, 2016
    Inventors: Michael James Lewis, Neil Leckett, A. A. Jithra Adikari
  • Publication number: 20160028543
    Abstract: A method for performing a cryptographic function on text to generate converted text comprises producing a random key stream having a first block size in a first frequency domain; converting the random key stream having a first block size in the first frequency domain to a random key stream in a second frequency domain; converting the random key stream having the first block size in the second frequency domain into smaller block sizes, thereby producing smaller block-sized random key stream of the second frequency domain; and converting the text using the smaller block-sized random key stream of the second frequency domain to produce the converted text. The frequency in the first frequency domain is preferably lower than the frequency in the second frequency domain.
    Type: Application
    Filed: March 5, 2015
    Publication date: January 28, 2016
    Inventors: Michael James Lewis, Neil Leckett, A.A. Jithra Adikari
  • Publication number: 20150296253
    Abstract: A method for determining the color depths of the video data for a selected frame in High-bandwidth Digital Content Protection (HDCP) video data transmitted over a High Definition Multimedia Interface (HDMI), in which (a) the beginning of the selected frame is marked with a vertical synchronization (VSYNC) signal and (b) a mark in a window of opportunity (WOO) for the selected frame indicates whether or not that frame is encrypted. The method detects, for the selected frame, the length of the interval between a VSYNC signal and the location of at least one of (i) the start of the corresponding WOO and (ii) the mark indicating whether or not the selected frame is encrypted, and then determines the color depth of the video data for the selected frame based on the detected length.
    Type: Application
    Filed: April 14, 2014
    Publication date: October 15, 2015
    Applicant: Elliptic Technologies Inc.
    Inventors: A.A. Jithra Adikari, Andrew Alexander Elias, Neil Leckett
  • Publication number: 20150295904
    Abstract: An HDCP receiver device that receives frames from an HDCP transmitter device. The receiver device has a frame counter that is updated for each frame that is received from the transmitter device and that includes encrypted content, while the receiver device is in a pre-authorization mode. During the pre-authorization mode, the receiver device does not decrypt any received frame bearing encrypted content. While the receiver device waits to transition from the pre-authorization mode to a post-authorization mode in which the receiver device can begin to decrypt any received frames that include encrypted content, the frame counter is updated for each frame received that includes encrypted content. In the post-authorization mode, the frame counter has a nonzero value if frames including encrypted content were received by the receiver device during the pre-authorization mode.
    Type: Application
    Filed: April 14, 2014
    Publication date: October 15, 2015
    Inventors: Andrew A. Elias, A.A. Jithra Adikari
  • Publication number: 20150178146
    Abstract: What is disclosed is an embodiment of a method for ciphering data. Data is provided for ciphering thereof. The data is ciphered in a plurality of steps. For each step, an encoding for error detection of the data for being processed within the step is determined. An output error detection encoding for the step is determined. The data for being processed within the round is processed to provide output error detection encoding which is then verified against the determined output error detection encoding. When the output error detection encoding is other than same as the determined error detection encoding, providing a signal indicative of an error within the cipher process.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 25, 2015
    Applicant: ELLIPTIC TECHNOLOGIES INC.
    Inventors: A. A. Jithra ADIKARI, Jean-Pierre THIBAULT, Mike BORZA
  • Patent number: 9008313
    Abstract: A system for generating random key stream cipher texts passes an unencrypted random key stream through an AES engine to produce encrypted cipher text having a first block size in a first frequency domain; converts the encrypted cipher text in the first frequency domain to encrypted cipher text in a second frequency domain; and converts the encrypted cipher text having the first block size in the second frequency domain into smaller block sizes. The frequency in the first frequency domain is preferably lower than the frequency in the second frequency domain. The converting of the encrypted cipher text in the first frequency domain to encrypted cipher text in a second frequency domain may be effected by a dual clock domain FIFO.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: April 14, 2015
    Assignee: Elliptic Technologies Inc.
    Inventors: Michael James Lewis, Neil Leckett, A. A. Jithra Adikari
  • Publication number: 20110270902
    Abstract: Methods and apparatus for multiplying integers using a double-base numbering system are presented. In one embodiment, a method includes splitting a first integer into a plurality of binary blocks. The method may also include encoding the plurality of binary blocks into a plurality of encoded blocks in a double-base numbering system. Additionally, the method may include producing a plurality of multiples of a second integer. The method may also include producing a plurality partial results. The method may include selectively shifting the plurality of partial results to generate a plurality of shifted partial results, and adding the plurality of partial results and the shifted partial results to create the product of a plurality of integers.
    Type: Application
    Filed: February 25, 2011
    Publication date: November 3, 2011
    Inventors: Vassil S. Dimitrov, Kimmo U. Järvinen, Jithra Adikari