Kaohsiung Medical University

Kun Shan University

National Chengchi University

Jeng-Nan Tzeng

Jer-Min Tsai

I-Te Chen

Wen-Hsien Ho

A random number generating method includes sending a signal source for outputting a data sequence and randomly retrieving a segment of data having an operation length as a seed; converting the seed into a first operation value, determining whether a difference between the first operation value and a second operation value is larger than a threshold value, and determining whether a total number of times the first operation value has been inputted into the operation value processing step is larger than a predetermined value. The first operation value is reset by a reset algorithm; otherwise the sample selection step is re-performed. The operation values are converted into a random number. A total number of bits of the random number is calculated. The operation value setting step is performed or a latest random number having a length equal to the operation length is set as the seed.

Random number generating method

A method is provided for securing transmission data between an upload device and a download device. The upload device is configured to generate a first matrix, a second matrix and a re-encryption vector, to encrypt a plaintext data file using the first matrix to obtain a ciphertext data file, to transmit the ciphertext data file and the re-encryption vector to a server, and to transmit the second matrix to the download device. The server is configured to re-encrypt the ciphertext data file using the re-encryption vector to obtain a re-encrypted data file that can be decrypted using the second matrix to obtain a decrypted data file, and to allow the download device to download the re-encrypted data file therefrom.

Growing community of inventors

Kaohsiung, Taiwan

Jeng-Nan Tzeng