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公开(公告)号：US11048805B2
公开(公告)日：2021-06-29
申请号：US15999360
申请日：2016-02-17
IPC分类号： G06F21/00 , G06F21/60 , H04L9/00 , G06F21/62 , G06F21/64 , G09C1/00 , G06F16/00 , G06F3/06 , H04L9/32 , H04L29/06
摘要： A method for storing data on a storage entity (SE) includes: computing a file identifier for a file to be stored on the SE; checking if the file has already been stored using the file identifier; generating a user-specific private and public identifier; updating or computing tags of the file by the client such that the updating or computing is homomorphic in the user-specific private identifier and in parts of the file; providing the user-specific public identifier, the updated tags and a proof of possession of the secret identifier to the SE; verifying the proof-of-possession; verifying validity of the tags; upon successful checking, storing a public identifier for the file incorporating the user-specific public identifier and the updated tags by the SE; and upon a case where it is determined that the file has not already been stored, storing the file.
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公开(公告)号：US20190108350A1
公开(公告)日：2019-04-11
申请号：US15999360
申请日：2016-02-17
摘要： A method for storing data on a storage entity (SE) includes: computing a file identifier for a file to be stored on the SE; checking if the file has already been stored using the file identifier; generating a user-specific private and public identifier; updating or computing tags of the file by the client such that the updating or computing is homomorphic in the user-specific private identifier and in parts of the file; providing the user-specific public identifier, the updated tags and a proof of possession of the secret identifier to the SE; verifying the proof-of-possession; verifying validity of the tags; upon successful checking, storing a public identifier for the file incorporating the user-specific public identifier and the updated tags by the SE; and upon a case where it is determined that the file has not already been stored, storing the file.
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3.发明申请公开(公告)号：US20230038304A1
公开(公告)日：2023-02-09
申请号：US17960872
申请日：2022-10-06
发明人： Ghassan Karame , Frederik Armknecht
摘要： A method for storing information includes receiving information to be stored and an information tag from a user computing entity, and storing the information and the information tag. The information to be stored includes a chunk that is divided into a plurality of blocks each comprising one or more elements. The information tag comprises a plurality of tags each having been computed for one of the blocks, wherein the tag for the j-th block of the i-th chunk is based on: an output of a random function using as input: 1) an output of an index function mapping each index j to a certain value, and/or 2) a seed sampled for the i-th chunk; the j-th block; and a representation of a second secret comprising one or more random elements each associated with a respective one of the one or more elements of one of the blocks.
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公开(公告)号：US10372918B2
公开(公告)日：2019-08-06
申请号：US15550373
申请日：2015-02-13
摘要： A method for storing a data file of a client on a storage entity includes generating, by a proxy entity, a master encryption key; encrypting, by the client, the data file using the master encryption key to produce an encrypted file; computing a hash-tree for the encrypted file and using a top-hash of the hash-tree as a file identification (FID); and determining, by the proxy entity, whether the FID is already known to the storage entity. If the FID is not already known to the storage entity the method further includes computing, by the proxy entity, a top-hash of the encrypted file (PFID), and when the ownership of the data file has been proven, storing the FID being equal with the PFID at the client together with the hash value.
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5.发明授权公开(公告)号：US11502856B2
公开(公告)日：2022-11-15
申请号：US16468714
申请日：2016-12-14
发明人： Ghassan Karame , Frederik Armknecht
IPC分类号： H04L9/32 , H04L9/08 , G06F12/06 , G06F16/182
摘要： A method for providing information to be stored includes computing a storable first secret for generating a random value based on a random function. The information to be stored is provided as a chunk which is divided into blocks each having an element. A storable second secret comprising a random element is computed. A tag is computed for each block such that the tag for the j-th block of the i-th chunk is computed using: an output of the random function, the j-th block, and a representation of the second secret. The information to be stored is provided together with an information tag comprising the computed tags of each block of each chunk.
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公开(公告)号：US20200304308A1
公开(公告)日：2020-09-24
申请号：US16088086
申请日：2016-04-08
发明人： Frederik Armknecht , Ghassan Karame
IPC分类号： H04L9/32
摘要： A method for providing a proof-of-retrievability (POR) to a client for data stored on a storage entity includes the steps of: a) Encoding, by the client, data to be stored on the storage entity; b) Exchanging credentials between the storage entity, the client, and an auditor; c) Committing, by the client, to the encoded information using data identification information; d) Storing the encoded data on the storage entity together with the data identification information e) Computing, by the auditor, logging information for the stored data by performing one or more POR between the auditor and the storage entity, wherein for sampling randomness for the POR a public source of unpredictable randomness is used; Verifying, by the auditor, the computed logging information; and g) Verifying, by the client, the verified logging information of the auditor in a single batch verification procedure.
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7.发明申请公开(公告)号：US20200099537A1
公开(公告)日：2020-03-26
申请号：US16468714
申请日：2016-12-14
发明人： Ghassan Karame , Frederik Armknecht
摘要： A method for providing information to be stored includes computing a storable first secret for generating a random value based on a random function. The information to be stored is provided as a chunk which is divided into blocks each having an element. A storable second secret comprising a random element is computed. A tag is computed for each block such that the tag for the j-th block of the i-th chunk is computed using: an output of the random function, the j-th block, and a representation of the second secret. The information to be stored is provided together with an information tag comprising the computed tags of each block of each chunk.
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公开(公告)号：US20210271764A1
公开(公告)日：2021-09-02
申请号：US17325230
申请日：2021-05-20
摘要： A method for storing data on a storage entity (SE) includes: computing a file identifier for a file to be stored on the SE; checking if the file has already been stored using the file identifier; generating a user-specific private and public identifier, wherein generating the user-specific private identifier is based on using an oblivious key generation protocol between the client and a trusted entity, and wherein the user-specific private identifier is a deterministic private identifier; updating or computing tags of the file by the client such that the updating or computing is homomorphic in the user-specific private identifier and in parts of the file; and providing the user-specific public identifier, the updated tags and a proof of possession of the secret identifier to the SE to enable the SE to store information associated with the file.
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公开(公告)号：US20200021656A1
公开(公告)日：2020-01-16
申请号：US16579897
申请日：2019-09-24
摘要： A method for storing data in a cloud includes receiving at least one data file to be stored together with a predefined number t of replicas of the at least one data file within the cloud, at least one authentication tag corresponding to the at least one data file and t functions that are configurable to take at least a predefined time to compute; storing the at least one data file within the cloud; computing t solutions of the t functions within the cloud; generating the t replicas of the at least one data file based on the t solutions of the t functions and the at least one data file within the cloud, wherein each of the t functions is used for at least one of the t replicas of the at least one data file; and storing the t replicas within the cloud.
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公开(公告)号：US10447696B2
公开(公告)日：2019-10-15
申请号：US15310801
申请日：2015-05-18
摘要： A method for proving retrievability (POR) of information is performed in a memory available to one or more computation devices, wherein credentials between a user device, a storing device and an auditing device between each pair of said devices are exchanged and used for communication between them. The method includes encoding information to be stored on the storing device by the user device or the auditing device, storing the encoded information on the storing device, verifying the correctness of the stored information by the auditing device using unpredictable random information, transmitting correctness information to the user device, the correctness information being secure and being generated based on the result of the verification by the auditing device, and validating the correctness information by the user device for proving retrievability of the stored information and the unpredictable random information.
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