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公开(公告)号：US20240048385A1
公开(公告)日：2024-02-08
申请号：US18482537
申请日：2023-10-06
申请人： PQShield Ltd
发明人： Thomas PREST , Shuichi KATSUMATA
IPC分类号： H04L9/32
CPC分类号： H04L9/3213 , H04L9/3247
摘要： A method includes, at a first communications device: processing encapsulation keys of a plurality of second communications devices using an encapsulation function to generate a symmetric key, an authenticable token, and a ciphertext; and transmitting, to each of the second communications devices, the token and a respective portion of the ciphertext depending on the respective encapsulation key of that second communications device. The token is a cryptographic commitment of the symmetric key, and the ciphertext is a multi-recipient encapsulation of the symmetric key under the encapsulation keys of the second communications devices. The method further includes, at each second communications device: processing the respective decapsulation key and the respective portion of the ciphertext using a decapsulation function to generate a respective candidate copy of the symmetric key; authenticating the token, whereby to determine that the respective candidate copy of the symmetric key corresponds to the symmetric key.
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公开(公告)号：US20240314113A1
公开(公告)日：2024-09-19
申请号：US18674380
申请日：2024-05-24
申请人： PQShield Ltd.
发明人： Shuichi KATSUMATA , Thomas PREST
CPC分类号： H04L63/061 , H04L9/0825 , H04L9/0838 , H04L9/14 , H04L9/3255
摘要： A key generation method is provided. A first peer obtains an ephemeral key from a second peer via a server. The first peer uses the ephemeral key to compute a ciphertext that encrypts a first parameter. The first peer uses the first parameter to generate a session key. The ciphertext is sent to the server by the first peer to allow the second peer to generate the session key. The key may be subsequently used for communication, such as by using a key management algorithm such as Double Rachet.
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公开(公告)号：US20220294611A1
公开(公告)日：2022-09-15
申请号：US17825845
申请日：2022-05-26
申请人： PQShield Ltd.
发明人： Shuichi KATSUMATA , Thomas PREST
摘要： A key generation method is provided. A first peer obtains an ephemeral key from a second peer via a server. The first peer uses the ephemeral key to compute a ciphertext that encrypts a first parameter. The first peer uses the first parameter to generate a session key. The ciphertext is sent to the server by the first peer to allow the second peer to generate the session key. The key may be subsequently used for communication, such as by using a key management algorithm such as Double Rachet.
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公开(公告)号：US20230224281A1
公开(公告)日：2023-07-13
申请号：US17937969
申请日：2022-10-04
申请人： PQShield Ltd
CPC分类号： H04L63/0428 , H04L9/0869 , H04L9/30
摘要： Disclosed herein are method and systems for transmitting a plurality of ciphertexts to a plurality of users. The systems and methods described herein provide for performing an encryption update comprising a plurality of encryption keys and a multi-ciphertext to a plurality of recipient nodes. Methods and systems for organizing a database are also disclosed herein.
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公开(公告)号：US20220138349A1
公开(公告)日：2022-05-05
申请号：US17576299
申请日：2022-01-14
申请人： PQShield Ltd
摘要： Cryptographic methods and systems are described. Certain examples relate to performing cryptographic operations that involve a cryptographic permutation. The methods and systems may be used to provide cryptographic functions such as hashing, encryption, decryption and random number generation. In one example, a cryptographic architecture is provided. The cryptographic architecture has a processor interface comprising a set of cryptographic registers, where the processor interface is accessible by at least one processing unit. The cryptographic architecture also has a cryptographic permutation unit comprising circuitry to perform a cryptographic permutation using data stored within the set of cryptographic registers. In examples, the at least one processing unit instructs the cryptographic permutation and accesses a result of the cryptographic permutation using the processor interface.
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公开(公告)号：US20220066741A1
公开(公告)日：2022-03-03
申请号：US17478518
申请日：2021-09-17
申请人： PQShield Ltd
摘要： Cryptographic methods and systems are described. Certain examples relate to performing cryptographic operations by updating a cryptographic state. The methods and systems may be used to provide cryptographic functions such as hashing, encryption, decryption and random number generation. In one example, a non-linear feedback shift register or expander sequence is defined. The non-linear feedback shift register or expander sequence has a plurality of stages to receive the cryptographic state, wherein at least one of the plurality of stages is updated as a non-linear function of one or more other stages. In certain examples, a cryptographic state is updated over a plurality of rounds. Examples adapted for authenticated encryption and decryption, hashing, and number generation are described.
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公开(公告)号：US12021852B2
公开(公告)日：2024-06-25
申请号：US17825845
申请日：2022-05-26
申请人： PQShield Ltd.
发明人： Shuichi Katsumata , Thomas Prest
CPC分类号： H04L63/061 , H04L9/0825 , H04L9/0838 , H04L9/14 , H04L9/3255
摘要： A key generation method is provided. A first peer obtains an ephemeral key from a second peer via a server. The first peer uses the ephemeral key to compute a ciphertext that encrypts a first parameter. The first peer uses the first parameter to generate a session key. The ciphertext is sent to the server by the first peer to allow the second peer to generate the session key. The key may be subsequently used for communication, such as by using a key management algorithm such as Double Rachet.
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公开(公告)号：US20230396432A1
公开(公告)日：2023-12-07
申请号：US18330051
申请日：2023-06-06
申请人： PQShield Ltd
发明人： Rafaël Del Pino
IPC分类号： H04L9/08
CPC分类号： H04L9/0891
摘要： Described herein are methods and systems for updating encryption keys. The updating may comprise application of an update token to a key to generate a second key. The updating may comprise application of a second update token to the key to generate a third key. The key may be the same key in both update operations.
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公开(公告)号：US11635952B2
公开(公告)日：2023-04-25
申请号：US17125573
申请日：2020-12-17
申请人： PQShield Ltd
发明人： Shuichi Katsumata , Thomas Prest
摘要： Certain examples described herein relate to secure update propagation. The examples present systems and methods to transmit data in the form of updates over a network and to ensure the authenticity of the updates. The examples use a set-homomorphic digital signature scheme to sign updates such that a combined digital signature may be used to verify a batch of updates in place of a set of individual digital signatures. The combined digital signature may be generated by aggregating individual digital signatures.
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公开(公告)号：US11822901B2
公开(公告)日：2023-11-21
申请号：US17478518
申请日：2021-09-17
申请人： PQShield Ltd
CPC分类号： G06F7/584 , G06F7/768 , G06F9/30029 , G06F9/30032 , G06F21/602 , G06F21/72 , H04L9/0631 , H04L9/0643
摘要： Cryptographic methods and systems are described. Certain examples relate to performing cryptographic operations by updating a cryptographic state. The methods and systems may be used to provide cryptographic functions such as hashing, encryption, decryption and random number generation. In one example, a non-linear feedback shift register or expander sequence is defined. The non-linear feedback shift register or expander sequence has a plurality of stages to receive the cryptographic state, wherein at least one of the plurality of stages is updated as a non-linear function of one or more other stages. In certain examples, a cryptographic state is updated over a plurality of rounds. Examples adapted for authenticated encryption and decryption, hashing, and number generation are described.
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