Patent ID: 8229122
Filing Date: 2012-07-24
Classification: G06Q,G07F,H04L

Abstract:
1. A shared key transmission apparatus comprising: a reception unit configured to receive, from an automatic teller machine, a first cryptogram comprising an encrypted random number; a decryption unit configured to restore the random number from the first cryptogram; an encryption unit configured to: generate a second cryptogram by encrypting a shared key using the restored random number; generate a third cryptogram by encrypting the second cryptogram using a first public key; and generate a fourth cryptogram by encrypting the third cryptogram using a first secret key; and a transmission unit configured to transmit the third cryptogram and the fourth cryptogram to the automatic teller machine, the automatic teller machine decrypting the third cryptogram using a second secret key and decrypting the fourth cryptogram using a second public key, the automatic teller machine comparing the decrypted fourth cryptogram with the third cryptogram to authenticate the shared key transmission apparatus.