1

A key distribution method, comprising:notifying, by an application provider management platform, a supplementary security domain of an application provider that is set on a smart card and corresponds to the application provider management platform to generate a public/private key pair including a public cryptographic key and a private cryptographic key;

receiving, by the application provider management platform, the public cryptographic key from the supplementary security domain of the application provider that has been encrypted by a public key of the application provider obtained in advance and has been signed by a Controlling Authority Supplementary security domain (CASD) that is a trustable third-party supplementary security domain on the smart card through a card issuer management platform;

authenticating, by the application provider management platform, a signature and using a private key of the application provider to perform decryption to obtain the public cryptographic key; and

sending, by the application provider management platform, a trust point's public key used for external authentication and a certificate of the supplementary security domain of the application provider to the supplementary security domain of the application provider after the trust point's public key and the certificate have been encrypted by the public cryptographic key of the supplementary security domain of the application provider and the encrypted data have been signed by the private key of the application provider, to complete distribution of an cryptographic key of the supplementary security domain.

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2

The method according to Claim 1, wherein before processing of notifying, by the application provider management platform, the supplementary security domain of the application provider to generate the public/private key pair, the method further comprising:sending, by the application provider management platform, a certificate of the application provider to the supplementary security domain of the application provider, so as to make the supplementary security domain of the application provider authenticate the certificate of the application provider; and

if the authentication of the certificate of the application provider passes, executing the processing of notifying, by the application provider management platform, the supplementary security domain of the application provider to generate the public/private key pair.

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3

The method according to Claim 2, wherein processing of sending, by the application provider management platform, the certificate of the application provider to the supplementary security domain of the application provider specifically comprises:obtaining, by the application provider management platform, a public key of the CASD; and

encrypting, by the application provider management platform, the certificate of the application provider using the public key of the CASD, and sending the encrypted certificate of the application provider to the supplementary security domain of the application provider through the card issuer management platform.

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4

The method according to Claim 3, wherein processing of obtaining, by the application provider management platform, the public key of the CASD specifically comprises:obtaining, by the application provider management platform, the certificate of the CASD through the smart card; and

authenticating, by the application provider management platform, the certificate of the CASD, and obtaining the public key of the CASD.

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5

The method according to Claim 2, wherein after the authentication of the certificate of the application provider passes by the supplementary security domain of the application provider, the method further comprising:obtaining, by the supplementary security domain of the application provider, the public key of the application provider through the certificate of the application provider.

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6

The method according to Claim 5, wherein after the application provider management platform sends the trust point's public key used for external authentication and the certificate of the supplementary security domain of the application provider to the supplementary security domain of the application provider, the method further comprising:receiving, by the supplementary security domain of the application provider, the trust point's public key used for external authentication and the certificate of the supplementary security domain of the application provider that have been subjected to encryption and signature processing; and

using, by the supplementary security domain of the application provider, the public key of the application provider to authenticate the signature, and if the authentication passes, using the private key of the supplementary security domain of the application provider to perform the decryption to obtain the trust point's public key used for external authentication and the certificate of the supplementary security domain of the application provider.

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7

The method according to Claim 6, wherein the application provider management platform applies for the certificate of the supplementary security domain of the application provider from a Certificate Authority (CA) of the application provider.

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8

The method according to Claim 1, wherein before the application provider management platform obtains the public key of the CASD, the method further comprising:creating, by the application provider management platform, the supplementary security domain of the application provider on the smart card, and sending basic information of the supplementary security domain of the application provider to the application provider management platform, wherein the basic information includes identification information and configuration information of the supplementary security domain of the application provider.

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9

A key distribution system, comprising:a card issuer management platform, which further comprises:

a creating module, used for creating a supplementary security domain of an application provider on a smart card; and

an information sending module, used for sending basic information of the supplementary security domain of the application provider to an application provider management platform, wherein the basic information includes configuration information and identification information of the supplementary security domain of the application provider;

the application provider management platform, which further comprises:

a notifying module, used for notifying the supplementary security domain of the application provider to generate a public/private key pair including a public cryptographic key and a private cryptographic key;

a first receiving module, used for receiving the public cryptographic key from the supplementary security domain of the application provider, wherein the public cryptographic key has been encrypted by the public key of the application provider obtained in advance and has been signed by a CASD on the smart card;

a first obtaining module, used for authenticating a signature and using the private key of the application provider to perform decryption to obtain the public cryptographic key; and

a first sending module, used for sending the supplementary security domain of the application provider a trust point's public key used for external authentication and a certificate of the supplementary security domain of the application provider that have been subjected to encryption by the public cryptographic key and to signing on encrypted data by the private key of the application provider;

the smart card, which is located at a mobile terminal and comprises the supplementary security domain of the application provider, wherein the supplementary security domain of the application provider further comprises:

a second obtaining module, used for obtaining the public key of the application provider;

a second sending module, used for sending the application provider management platform the public cryptographic key having been encrypted by the public key of the application provider and signed by the CASD;

a second receiving module, used for receiving the trust point's public key used for external authentication and the certificate of the supplementary security domain of the application provider that have been subjected to encryption and signature processing; and

a decrypting module, used for using the public key of the application provider to authenticate the signature for the data received by the receiving module, and if the authentication passes, using the private key of the supplementary security domain of the application provider to perform the decryption to obtain the trust point's public key used for external authentication and the certificate of the supplementary security domain of the application provider.

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10

The system according to Claim 9, wherein the smart card further comprises the CASD for authenticating the certificate of the application provider and signing the public cryptographic key.

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