Binding with cryptographic key attestation
Generally discussed herein are devices, systems, and methods for binding with cryptographic key attestation. A method can include generating, by hardware of a device, a device public key and a device private key, based on the device private key, signing a first attestation resulting in a signed first attestation, the first attestation claiming the device private key originated from the hardware, based on the device public key and the signed first attestation, registering the device with a trusted authority, generating, by the hardware, a first application private key and a first application public key, and based on the device private key, signing a second attestation resulting in a signed second attestation, the second attestation claiming the first application private key originated from the hardware, and based on the first application public key and the signed second attestation, registering a first application of the device to a first server.
1. A device comprising:
a hardware backed key store configured to:
generate a device key pair, the device key pair including a device private key and a device public key; and
based on the device private key, sign a first attestation resulting in a signed first attestation, the first attestation claiming the device private key originated from the hardware backed key store;
generate a first application key pair, the first application key pair including first application private key and a first application public key;
based on the device private key, sign a second attestation resulting in a signed second attestation, the second attestation claiming the first application private key originated from the hardware backed key store;
communications circuitry configured to:
based on the device public key and the signed first attestation, register the device with a trusted authority;
based on the first application public key and the signed second attestation, register a first application of the device to a first server;
receive, from the trusted authority, a certificate attesting the device private key originated from the hardware backed key store; and
wherein registering the first application of the device includes providing the certificate to the first server.
2. The device of claim 1 , wherein registering the device and the first application includes communication over a transport layer security channel.
3. The device of claim 1 , wherein:
the hardware backed key store is further configured to:
generate a second application key pair, the second application key pair including a second application private key and a second application public key; and
based on the device private key, sign a third attestation resulting in a signed third attestation; and
the communications circuitry is further configured to:
based on the second application public key and the signed third attestation, register a second application of the device to a second server.
4. The device of claim 1 , wherein the hardware backed key store is further configured to derive the device public key and the device private key from a hardware backed key that is unique to the hardware backed key store of the device.
5. The device of claim 1 , wherein the device private key is a Rivest-Shafir-Adleman (RSA) signing key or an elliptic curve cryptography (ECC) signing key.
6. A method comprising:
generating, by hardware of a device, a device key pair, the device key pair including a device private key and a device public key;
based on the device private key, signing a first attestation resulting in a signed first attestation, the first attestation claiming the device private key originated from the hardware;
based on the device public key and the signed first attestation, registering the device with a trusted authority;
generating, by the hardware, a first application key pair, the first application key pair including first application private key and a first application public key;
based on the device private key, signing a second attestation resulting in a signed second attestation, the second attestation claiming the first application private key originated from the hardware;
based on the first application public key and the signed second attestation, registering a first application of the device to a first server;
receive, from the trusted authority, a certificate attesting the device private key originated from the hardware backed key store; and
wherein registering the first application of the device includes providing the certificate to the first server.
7. The method of claim 6 , wherein registering the device and the first application includes communication over a transport layer security channel.
8. The method of claim 6 , further comprising:
generating, by the hardware, a second application key pair, the second application key pair including a second application private key and a second application public key;
based on the device private key, signing a third attestation resulting in a signed third attestation; and
based on the second application public key and the signed third attestation, registering a second application of the device to a second server.
9. The method of claim 6 , further comprising deriving the device public key and the device private key from a hardware backed key that is unique to the hardware of the device.
10. The method of claim 6 , wherein the device private key is a Rivest-Shafir-Adleman (RSA) signing key or an elliptic curve cryptography (ECC) signing key.
11. A non-transitory machine-readable medium including instructions stored thereon that, when executed by a device, cause the device to perform operations comprising:
generating a device key pair, the device key pair including a device private key and a device public key;
based on the device private key, signing a first attestation resulting in a signed first attestation, the first attestation claiming the device private key originated from hardware of the device;
based on the device public key and the signed first attestation, registering the device with a trusted authority;
generating a first application key pair, the first application key pair including first application private key and a first application public key;
based on the device private key, signing a second attestation resulting in a signed second attestation, the second attestation claiming the first application private key originated from the hardware;
based on the first application public key and the signed second attestation, registering a first application of the device to a first server;
receive, from the trusted authority, a certificate attesting the device private key originated from the hardware backed key store; and
wherein registering the first application of the device includes providing the certificate to the first server.
12. The non-transitory machine-readable medium of claim 11 , wherein registering the device and the first application includes communication over a transport layer security channel.
13. The non-transitory machine-readable medium of claim 11 , wherein the operations further comprise:
generating a second application key pair, the second application key pair including a second application private key and a second application public key;
based on the device private key, signing a third attestation resulting in a signed third attestation; and
based on the second application public key and the signed third attestation, registering a second application of the device to a second server.
14. The non-transitory machine-readable medium of claim 11 , wherein the operations further comprise deriving the device public key and the device private key from a hardware backed key that is unique to the hardware of the device.