A key management device and method

Abstract

The invention discloses a key management device and a key management method. A SRAM PUF (Static Random Access Memory Physically Unclonable Function) and a key derivation function (KDF) unit are set in the key management device; when the key management device is going to generate a key, challenge information, key identifier information and response of the SRAM PUF are taken together as input to be input into the KDF unit; the KDF unit obtains key output, corresponding to the challenge information, of corresponding key identifier information after executing calculation based on a key derivation algorithm. Since the key management device provided by the embodiment of the invention establishes strong PUF by only one SRAM PUF, cost of conventionally establishing the Strong PUF is saved.

Description

technical field [0001] The invention relates to the field of information security, in particular to a key management device and method. Background technique [0002] With the development of semiconductor manufacturing technology, a Physically Unclonable Function (PUF, Physically Unclonable Function) appears. PUF has great application prospects in security aspects such as system authentication and the whole life cycle of keys, and has become an important semiconductor device in the field of embedded hardware security. Inputting a stimulus to a PUF outputs an unpredictable and unique response message using the random differences in its inevitable intrinsic physical configuration. The stimulus input to the PUF is called the challenge information (Challenge), and the information output by the PUF is called the response (Response). There is a one-to-one correspondence between the challenge information and the response, which is called a challenge response pair (Challenge Respon...

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Problems solved by technology

However, since there is only one SRAM PUF initialization state, only one set of keys can be output, so if the key management device is required to generate different groups of keys, a large number of different SRAM PUFs are required to be integrated into one key management device, so that it can Generates multiple sets of different key outputs, which increases the cost of the key management device

In order to reduce the cost of the key management device, Strong PUF can be considered as the key management device. However, due to the limitation of the semiconductor manufacturing process, the manufacture of Strong PUF faces problems such as large footprint and difficult structure. Strong PUF is used as the key The feasibility of using the management device is not good

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