Samsung Electronics Co., Ltd.

Jung-Hee Cheon

Sung-joon Park

Weon-il Jin

Dae-youb Kim

Hwan-joon Kim

Eun-sun Yoo

Myung-hwan Kim

Myung-Sun Kim

Jae-Woo Seo

Sung-Joon Park

Tae-Chul Jung

Nam-Su Jho

Myung-Hwan Kim

Mi-Ran Kim

Tae-Kyoung Kwon

Mun-Kyu Lee

Jeong-hyun Yi

Nam-su Jho

Hong-tae Kim

Weon-Il Jin

Dae-Youb Kim

Hwan-Joon Kim

Eun-Sun Yoo

A method for managing data by an electronic device is provided. The method includes receiving first data inputted from a user, generating second data by encrypting the first data using a public key, generating a query comprising the second data, transmitting the query to a server, receiving third data corresponding to the query from the server, generating fourth data by decrypting the third data using a secret key corresponding to the public key, and outputting the fourth data.

Method and system for communicating homomorphically encrypted data

A user key management method for a broadcast encryption includes assigning node path identifiers (IDs) to nodes arranged in sequence; assigning random seed value keys to the nodes according to the node path IDs; generating key values by repeatedly applying a hash function to the assigned random seed value keys; and assigning the generated key values to the nodes in sequence. Accordingly, it is possible to reduce the transmission overhead that is most important matter in the broadcast encryption to less than the number of the revoked users. Further, there is an advantage that the transmission overhead of the exemplary embodiments of the present invention is remarkably reduced compared with the Subset Difference method.

Method of managing user key for broadcast encryption

A method for generating, operating, and using a sparse w-NAF key for encryption is disclosed. The method for generating a key comprises generating a string of a number of coefficients, in which at most one coefficient, excluding 0, among a consecutive w number of coefficients, corresponds to a positive odd integer equal to or less than 2(w being a natural number equal to or more than 2); and outputting the generated string as a key. Accordingly, an encryption is executed through an exponential operation or scalar multiplication using a sparse w-NAF key having the scarce coefficients, excluding 0, such that an encryption pace is improved.

Method for generating, operating, and using a sparse w-NAF key for encryption

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Seoul, South Korea

Jung-Hee Cheon