Abstract: An apparatus and method that prevent a bit error in a static random access memory (SRAM)-based Physically Unclonable function (PUF). The method for preventing an error in a PUF includes selecting any value, from a physically unclonable function based on a volatile memory device, as an input value, and checking a response corresponding to the selected input value, classifying cells having a plurality of bits corresponding to the response depending on frequency of error occurrence, calculating a number of white cells, in which an error does not occur, from classified results, and determining whether the number of white cells is greater than a preset threshold number of white cells, and selecting an input value of the physically unclonable function based on results of determination.

Abstract: A method and apparatus for controlling the operation of flash memory are provided. The apparatus for controlling the operation of flash memory includes a control unit and a voltage adjustment unit. The control unit outputs a control signal adapted to change one or more of the program, erase and read voltage conditions for the flash memory to the voltage adjustment unit in response to the input of a PUF mode selection signal. The voltage adjustment unit changes the one or more of the program, erase and read voltage conditions for the flash memory in response to the input of the control signal.

Abstract: An apparatus and method that prevent a bit error in a static random access memory (SRAM)-based Physically Unclonable function (PUF). The method for preventing an error in a PUF includes selecting any value, from a physically unclonable function based on a volatile memory device, as an input value, and checking a response corresponding to the selected input value, classifying cells having a plurality of bits corresponding to the response depending on frequency of error occurrence, calculating a number of white cells, in which an error does not occur, from classified results, and determining whether the number of white cells is greater than a preset threshold number of white cells, and selecting an input value of the physically unclonable function based on results of determination.

Abstract: An apparatus and method for remotely deleting critical information is provided. The apparatus includes a storage unit, an identity determination unit, and a broadcast unit. The storage unit stores an input value and an output value for the input value with respect to a physically unclonable function (PUF) of each of a plurality of mobile terminals. The identity determination unit determines the identity of a corresponding mobile terminal based on received information about the loss of the mobile terminal. The broadcast unit extracts the input and output values of the PUF of the corresponding mobile terminal from the storage unit based on information transferred from the identity determination unit, and broadcasts the extracted input and output values to all the mobile terminals.

Abstract: A secret key generation apparatus and method are provided. The secret key generation apparatus includes at least one antenna, amplification/phase controllers, a transceiver, and a random signal controller. The antenna receives a wireless signal from a counterpart terminal that performs wireless communication. The amplification/phase controllers control the amplification gain and phase of the wireless signal that is received via at least one antenna. The transceiver measures the status of a wireless channel using the wireless signal having the controlled amplification gain and phase, determines parameters based on results of the measurement, and generates a secret key based on results of the determination. The random signal controller controls the amplification/phase controllers so that the amplification gain and phase are adjusted whenever the transceiver generates a secret key.

Abstract: An apparatus and method for generating a group key using the status of a wireless channel are provided. The apparatus includes a representative channel response selection unit for selecting a representative channel response signal from among pilot signals received from slave terminals. A key generation unit generates a group key based on a representative channel response value of the representative channel response signal. A hash value generation unit generates a hash value corresponding to the group key. A transmission pilot control unit adjusts power intensities of transmission pilots of the respective slave terminals using the channel response value of the representative channel response signal and channel response values and transmission power intensities of the slave terminals. A communication unit is individually connected to the slave terminals and configured to transmit pilot signals, power intensities of which have been adjusted, and the hash value to the slave terminals.

Abstract: A method and apparatus for controlling the operation of flash memory are provided. The apparatus for controlling the operation of flash memory includes a control unit and a voltage adjustment unit. The control unit outputs a control signal adapted to change one or more of the program, erase and read voltage conditions for the flash memory to the voltage adjustment unit in response to the input of a PUF mode selection signal. The voltage adjustment unit changes the one or more of the program, erase and read voltage conditions for the flash memory in response to the input of the control signal.

Abstract: An apparatus and method for remotely deleting critical information is provided. The apparatus includes a storage unit, an identity determination unit, and a broadcast unit. The storage unit stores an input value and an output value for the input value with respect to a physically unclonable function (PUF) of each of a plurality of mobile terminals. The identity determination unit determines the identity of a corresponding mobile terminal based on received information about the loss of the mobile terminal. The broadcast unit extracts the input and output values of the PUF of the corresponding mobile terminal from the storage unit based on information transferred from the identity determination unit, and broadcasts the extracted input and output values to all the mobile terminals.

Abstract: An apparatus and method for generating a group key using the status of a wireless channel are provided. The apparatus includes a representative channel response selection unit for selecting a representative channel response signal from among pilot signals received from slave terminals. A key generation unit generates a group key based on a representative channel response value of the representative channel response signal. A hash value generation unit generates a hash value corresponding to the group key. A transmission pilot control unit adjusts power intensities of transmission pilots of the respective slave terminals using the channel response value of the representative channel response signal and channel response values and transmission power intensities of the slave terminals. A communication unit is individually connected to the slave terminals and configured to transmit pilot signals, power intensities of which have been adjusted, and the hash value to the slave terminals.

Abstract: A secret key generation apparatus and method are provided. The secret key generation apparatus includes at least one antenna, amplification/phase controllers, a transceiver, and a random sign& controller. The antenna receives a wireless signal from a counterpart terminal that performs wireless communication. The amplification/phase controllers control the amplification gain and phase of the wireless signal that is received via at least one antenna. The transceiver measures the status of a wireless channel using the wireless signal having the controlled amplification gain and phase, determines parameters based on results of the measurement, and generates a secret key based on results of the determination. The random signal controller controls the amplification/phase controllers so that the amplification gain and phase are adjusted whenever the transceiver generates a secret key.

Abstract: A method for recovering a frame erasure at a voice over internet protocol (VoIP) environment is provided. The method includes: extracting coder parameters of received packets; if an erased packet exists during the extracting of the coder parameters, regenerating speech characteristic parameters of the erased packet by referencing a vector quantization codebook index interpolation table (VCIIT) formulated based on representative values of speech characteristic parameters reflecting auditory recognition characteristics and performing a linear interpolation on speech characteristic parameters of the normally received packets allocated previous and future of the erased packet; and recovering the erased packet by combining the regenerated speech characteristic parameters. The proposed frame erasure recovery method can minimize an additional delay and increases in bandwidth and computation and improve a capability of recovering the erasure.