Electronics and Telecommunications Research Institute

Donghyouk Lim

Seokhyun Kim

Sangho Yi

Seungmin Park

Jaemyoung Kim

Yookun Cho

Jaeheung Lee

Jinha Oh

Yungjoon Jung

Youngbin Seo

Disclosed is a flash memory device having a secure flash file deletion function and a method for securely deleting a flash file. Data and object headers as actual contents of the flash file are separately stored in data blocks and header blocks. At this time, the data is encrypted and stored, and a decryption key is included in an object header and stored in a header block. When the flash file is deleted, the object header is deleted by searching the header block where the object header including the decryption key is stored. In order to search the header block, a binary tree structure is used in which a terminal node indicates an LSB of a file ID. Disclosed may be applied to an embedded system where a flash memory is used as a storage medium. In particular, disclosed is suitable for a NAND flash memory device.

Flash memory device having secure file deletion function and method for securely deleting flash file

Provided is a method for reducing memory power consumption. A period of time allocated to a process is split into time slices each have a predetermined time interval, and a timer interrupt is generated for every time slice. It is checked whether context switch between processes occurs when the timer interrupt is generated. Memory banks having a memory allocated to a switched process are activated when the context switch occurs. All banks of a memory are converted into a low power state when the context switch does not occur. Accordingly, memory power consumption can be reduced through a software technique.

Method for reducing memory power consumption

Growing community of inventors

Daejeon, North Korea

Donghyouk Lim