SESSION NEGOTIATIONS

• US 20180083929A1
• Filed: 11/27/2017
• Published: 03/22/2018
• Est. Priority Date: 06/13/2013
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Roth, Gregory Branchek, Wren, Matthew James, Brandwine, Eric Jason, Pratt, Brian Irl
• Granted Patent: US 10,601,789 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0435 wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption cryptographic mechanisms or cryptographic arrangements for symmetric key encryption H04L9/06
• CPC Class Codes: H04L 63/0807 using tickets, e.g. Kerberos cryptographic mechanisms or cryptographic arrangements for entity authentication using tickets or tokens H04L9/3213
• CPC Class Codes: H04L 9/0822 using key encryption key
• CPC Class Codes: H04L 9/0825 using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
• CPC Class Codes: H04L 9/083 involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
• CPC Class Codes: H04L 9/0891 Revocation or update of secret information, e.g. encryption key update or rekeying
• CPC Class Codes: H04L 9/0894 Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
• CPC Class Codes: H04L 9/14 using a plurality of keys or algorithms
• CPC Class Codes: H04L 9/16 the keys or algorithms being changed during operation
• CPC Class Codes: H04L 9/3213 using tickets or tokens, e.g. Kerberos network architectures or network communication protocols for entities authentication using tickets in a packet data network H04L63/0807
• CPC Class Codes: H04L 9/3234 involving additional secure or trusted devices, e.g. TPM, smartcard, USB or software token network architectures or network communication protocols for supporting authentication of entities using an additional device in a packet data network H04L63/0853
• CPC Class Codes: H04L 9/3247 involving digital signatures

Abstract

A plurality of devices are each operable to provide information that is usable for to prove authorization with any of the other devices. The devices may have common access to a cryptographic key. A device may use the cryptographic key to encrypt a session key and provide both the session key and the encrypted session key. Requests to any of the devices can include the encrypted session key and a digital signature generated using the session key. In this manner, a device that receives the request can decrypt the session key and use the decrypted session key to verify the digital signature.

Claims

1. A computer-implemented method, comprising:

under the control of one or more computer systems configured with executable instructions,

at a first security module of a plurality of security modules;

receiving, from an operator device, a first request for a session key;

in response to the first request, using a domain key to encrypt one or more session keys and information usable to identify the operator device, the domain key accessible to each of the plurality of security modules;

providing the one or more session keys and encrypted one or more session keys to the operator device; and

at a second security module of the plurality of security modules;

receiving, from the operator device, a second request to perform a cryptographic operation, the second request including an encrypted session key from the encrypted one or more session keys and a digital signature generated based at least in part on the session key;

using the domain key to decrypt the encrypted session key and the information usable to identify the operator device;

verifying that the operator device matches the information usable to identify the operator device

using the session key to verify the digital signature; and

as a result of verifying the digital signature and verifying that the operator device matches the information usable to identify the operator device, performing the requested cryptographic operation;

using the session key to encrypt a result of performing the requested cryptographic operation; and

providing the encrypted result to the operator device.

2. The computer-implemented method of claim 1, wherein:

the second request includes another key encrypted under the domain key;

performing the requested cryptographic operation includes decrypting the encrypted other key and using the decrypted other key to perform the requested cryptographic operation.

3. The computer-implemented method of claim 1, wherein:

the one or more session keys are encrypted with an expiration for the one or more session keys; and

verifying the digital signature includes confirming, based at least in part on the expiration, that the session key is unexpired.

4. The computer-implemented method of claim 1, wherein:

the second request is encrypted under the session key; and

the method further comprises using the session key to decrypt the second request.

5. The computer-implemented method of claim 1, wherein:

decrypting the encrypted session key uses a symmetric-key cryptographic algorithm; and

providing the session key includes using an asymmetric-key cryptographic algorithm to transfer the session key to the operator device.

6. The computer-implemented method of claim 1, wherein:

the second request is received as a result of receipt of a customer request of a customer of a computing resource service provider that hosts the plurality of security modules.

7. A computer-implemented method, comprising:

under the control of one or more computer systems configured with executable instructions,

at a first device, receiving a request to perform a cryptographic operation, the request including;

a first key encrypted based at least in part on a second key that is shared among a plurality of devices that includes the first device; and

information generated based at least in part on the first key in plaintext form; and

authentication information generated based at least in part on the first key

at the first device, in response to the request to perform the cryptographic operation;

using the second key to decrypt the encrypted first key;

using the first key to verify the authentication information;

determining, based at least in part on the first key, the information, and the authentication information, whether to perform the cryptographic operation; and

performing the cryptographic operation when said determining results in a determination to perform the cryptographic operation.

8. The computer-implemented method of claim 7, wherein the first key is received from a device that lacks access to the second key.

9. The computer-implemented method of claim 7, wherein:

the first key is encrypted by a second device, from the plurality of devices, that provided the encrypted first key to a third device; and

the request is from the third device.

10. The computer-implemented method of claim 7, wherein:

the request further includes an expiration for the first key; and

the determination is dependent on the first key being unexpired according to the expiration.

11. The computer-implemented method of claim 7, wherein the plurality of devices are security modules.

12. The computer-implemented method of claim 7, wherein:

the request includes data and a cryptographic key encrypted under the second key;

the method further includes decrypting the encrypted cryptographic key; and

performing the operation is based at least in part on the data and the decrypted cryptographic key.

13. A system, comprising:

a plurality of devices, each device of the plurality of devices configured with;

one or more processors; and

memory including instructions that, when executed by the one or more processors, provide the device an ability to;

generate, based at least in part on a first key accessible to each of the plurality of devices, information that is usable, by another device of the plurality of devices lacking access to the first key, for causing any device of the plurality of devices to provide a result of performance of one or more requested cryptographic operations; and

provide the generated information to the other device.

14. The system of claim 13, wherein:

the information includes a second key and is based at least in part on the first key without including the first key; and

the instructions, when executed by the one or more processors, further provide the device the ability to use the first key to verify that use of the second key is authorized.

15. The system of claim 13, wherein accessing any device of the plurality of devices includes causing a selected device from the plurality of devices to perform a cryptographic operation using a cryptographic key in response to a request, specifying the cryptographic key, to perform the cryptographic operation.

16. The system of claim 13, wherein the devices are security modules.

17. The system of claim 13, wherein the information includes an expiration for the information that limits an amount of time for which the information is usable for access to any device of the plurality of devices.

18. The system of claim 13, wherein generating the information is in response to an authenticated request for the information.