METHOD AND APPARATUS FOR DATA ENCRYPTION, AND METHOD AND APPARATUS FOR DATA DECRYPTION

摘要

PURPOSE: A method and an apparatus for data encryption are provided to accurately correct a counter value by subdividing the type of an encryption key. CONSTITUTION: An encryption key generator(110) generates an encryption key using current time information and includes a counter value calculation unit(112) and a function value obtaining unit(114). The counter value calculation unit calculates the counter value which shows the interval between a reference time and a current time. The counter value obtaining unit obtains the function value using an additional parameter with the counter value as an input value of a preset function. An encryption unit(120) encrypts the data using the generated encryption key. A transmission unit(130) transmits the encrypted data.