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公开(公告)号：US10270588B2
公开(公告)日：2019-04-23
申请号：US15147806
申请日：2016-05-05
Inventor： Taek-Young Youn , Nam-Su Jho , Ku Young Chang
Abstract: Provided are a method and a system for an additive homomorphic encryption scheme with operation error detection functionality. A plaintext is obtained by decrypting a ciphertext encrypted based on a homomorphic encryption technique and subjected to an operation and lower setting bits corresponding to additional secret information included in a final private-key are extracted as plaintext information from the acquired plaintext. An operation error check is performed on the remaining bits other than the lower setting bits in the acquired plaintext.
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2.发明授权Multi-user searchable encryption system and method with index validation and tracing 有权多用户可搜索加密系统和索引验证和跟踪方法公开(公告)号：US08873749B2
公开(公告)日：2014-10-28
申请号：US13705666
申请日：2012-12-05
Inventor： Nam-Su Jho , Ku Young Chang , Do Won Hong
CPC classification number: H04L9/0861 , H04L9/3073
Abstract: A multi-user searchable encryption system includes a key generation center to issue a private secret key to a user and trace information regarding a user who has generated an index, and a user terminal device to generate an index for searching for a database using the private secret key. The multi-user searchable encryption system includes a database (DB) server that verifies the index generated by the user terminal device and searches for corresponding data to the verified index.
Abstract translation: 多用户可搜索的加密系统包括密钥生成中心，用于向用户发出专用秘密密钥并跟踪关于已经生成索引的用户的信息;以及用户终端设备，用于生成用于使用私有的搜索数据库的索引 密钥。 多用户可搜索的加密系统包括数据库（DB）服务器，用于验证由用户终端设备生成的索引并搜索与已验证索引相对应的数据。
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Patent Agency Ranking
3.发明授权Apparatus and method for giving the compressed encryption functionality to integer-based homomorphic encryption schemes 有权将压缩的加密功能提供给基于整数的同态加密方案的装置和方法公开(公告)号：US09331851B2
公开(公告)日：2016-05-03
申请号：US14312049
申请日：2014-06-23
Inventor： Taek-Young Youn , Nam-Su Jho , Ku-Young Chang
CPC classification number: H04L9/0861 , H04L9/008 , H04L9/14 , H04L9/3066 , H04L2209/30
Abstract: The present invention relates to a compressed encryption and decryption apparatus comprising: an interface receiving a public key, a secret key and a compression ratio; a memory storing instructions for encryption and decryption of plaintexts; and a processor encrypting and decrypting plaintexts according to the instruction, wherein the instruction comprises instructions performing; generating an extended public key and an extended secret key by revising the public key and the secret key according to the compression ratio; outputting the extended public key; receiving compressed ciphertext; and decrypting the compressed ciphertext using modulo operation for multiplication of the extended secret key and the compressed ciphertext.
Abstract translation: 本发明涉及一种压缩加密和解密装置，包括：接收公钥，秘密密钥和压缩比的接口; 存储用于明文加密和解密的指令的存储器; 以及处理器，根据所述指令对明文进行加密和解密，其中所述指令包括指令执行; 通过根据压缩率修改公钥和秘密密钥来生成扩展公钥和扩展密钥; 输出扩展公钥; 接收压缩密文; 以及使用用于乘法扩展密钥和压缩密文的模运算解密压缩密文。
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公开(公告)号：US11791997B2
公开(公告)日：2023-10-17
申请号：US17239237
申请日：2021-04-23
Inventor： Nam-Su Jho , Juyoung Kim , Taek-Young Youn , Ku Young Chang
CPC classification number: H04L9/0869 , G06N3/04
Abstract: A method and an apparatus for generating a secret key for encrypted communication using a synchronized neural network, which includes: generating initial codewords based on a bit string of weight values of the synchronized neural network and transmitting a first partial codeword of the initial codewords to a device of another party; receiving a second partial codeword generated by the device of the other party and combining final codewords based on the second partial codeword received from the device of the party and the bit string of the weight values; performing an error correction on the combined final codewords and transmitting first restoration success information according to the error correction to the device of the other party; and receiving second restoration success information from the device of the other party and generating the secret key based on the restoration success information of the device of the other party, are provided.
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公开(公告)号：US10902144B2
公开(公告)日：2021-01-26
申请号：US16113530
申请日：2018-08-27
Inventor： Nam-Su Jho , Taek-Young Youn , Dae Sung Moon , Ik Kyun Kim , Seung Hun Jin
Abstract: In the present invention, by providing an apparatus for securing data comprising a memory for storing information for data processing, a processor configured to partition original data into a plurality of partial data and generate a plurality of divided data by randomly determining positions of each of the plurality of partial data within the original data, and a communication interface configured to transmit each of the plurality of divided data to each of a plurality of servers, respectively, if an attacker obtains a portion of the divided data, it prevents the entire original data from being restored, and the legitimate user can restore the original data accurately even if some divided data is corrupted, and provides an efficient data polymorphic dividing technique that can minimize the amount of calculation required to secure data.
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公开(公告)号：US10515225B2
公开(公告)日：2019-12-24
申请号：US15179375
申请日：2016-06-10
Inventor： Taek-Young Youn , Keonwoo Kim , Ku Young Chang , Nam-Su Jho
Abstract: The present invention relates to a method and device for verifying data ownership. The user may verify whether the server actually owns the data to be uploaded by him, and the server may simultaneously verify whether the user actually owns the data.
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公开(公告)号：US12095908B2
公开(公告)日：2024-09-17
申请号：US17518905
申请日：2021-11-04
Inventor： Nam-Su Jho , Ju-Young Kim , Ku-Young Chang
IPC: H04L9/08 , G06F18/214 , G06N3/04 , H04L9/06
CPC classification number: H04L9/0861 , G06F18/214 , G06N3/04 , H04L9/0643 , H04L9/0825 , H04L9/085
Abstract: Disclosed herein are a key generation apparatus and method based on machine learning. The key generation method includes generating, by first and second key generation apparatuses, first and second commit values, and uploading the first commit value and the second commit value to an external repository, training, by the first and second key generation apparatuses, a neural network so as to match weight values with each other, sharing, by the first and second key generation apparatuses, the first and second commit values with each other, comparing shared first and second commit values with uploaded commit values, and then verifying the commit values, and when verification of the commit values has succeeded, generating, by the first and second key generation apparatuses, hash values using the matched weight value, verifying whether the hash values are identical to each other, and generating a session secret key based on a result of verification.
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