Shared key transmission apparatus, automatic teller machine, automatic teller system and method of controlling the automatic teller machine

An automatic teller machine to perform a data communication with a host, to receive, online from a shared key transmission apparatus, a shared key used for the data communication, and to install the received shared key, the automatic teller machine comprising:

• an encryption unit to generate a random number and to encrypt the random number to thereby generate a first cryptogram;
• a transmission unit to transmit the first cryptogram to the shared key transmission apparatus;
• a reception unit to receive, from the shared key transmission apparatus, a shared key that is encrypted using the random number restored from the first cryptogram;
• and
• a decryption unit to restore the shared key from the encrypted shared key using the generated random number.

An automated teller system comprising:

• a shared key transmission apparatus to receive a shared key from a shared key management system and to encrypt the shared key using a random number;
• and
• an automatic teller machine to receive the encrypted shared key from the shared key transmission apparatus, to decrypt the encrypted shared key using the random number to thereby restore the shared key, and to install the restored shared key,
• wherein the random number is generated at the automatic teller machine.

A method of controlling an automatic teller machine to perform a data communication with a host, to receive, online from a shared key transmission apparatus, a shared key used for the data communication, and to install the received shared key, the method comprising:

• generating a random number and encrypting the random number to generate a first cryptogram;
• transmitting the first cryptogram to the shared key transmission apparatus;
• receiving, from the shared key transmission apparatus, a shared key that is encrypted using the random number restored from the first cryptogram;
• and
• restoring the shared key from the encrypted shared key using the generated random number.