| 摘要 |
Provided are a shared key transmission apparatus, an automatic teller machine (ATM), and a controlling method thereof. The shared key transmission apparatus may include: a reception unit receiving, from the ATM, a first cryptogram where a random number is encrypted; a description unit restoring the random number from the first cryptogram; an encryption unit encrypting the shared key using the restored random number; and a transmission unit transmitting the encrypted shared key to the ATM. The ATM may include: an encryption unit generating a random number and encrypting the random number to generate a first cryptogram; a transmission unit transmitting the first cryptogram to the shared key transmission apparatus; a reception unit receiving, from the shared key transmission apparatus, a shared key that is encrypted using the restored random number; and a decryption unit restoring the shared key from the encrypted shared key using the generated random number.
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