DS28E81+

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The DS28E81+ is a novel secure memory device from Maxim Integrated that enables secure key storage and validation of application designs, such as secure access control, secure industrial systems, and automotive security systems. This device is designed to help protect connected devices and applications from malicious hackers and tampering, while also providing secure authentication and encryption capabilities. To ensure the security of its secure memory devices, DS28E81+ integrates Cryptographic Coprocessors (CCPs) and a secure key storage feature within its design.

Secure Memory Design

The DS28E81+ secure memory device is similar in function to traditional non-volatile memory devices such as EEPROMs, but differs significantly in its secure design. Instead of simply storing key information, the device contains an on-chip cryptographic coprocessor, or CCP, that uses 128-bit AES encryption to digitally sign keys stored in its memory in order to validate them. As a result, the device is only accessible to authenticated individuals with the appropriate digital certificate.

The DS28E81+ also features a SHA-256 hashing algorithm to encrypt the keys stored on the device. To ensure the secure transfer of keys between devices, the DS28E81+ includes a secure protocol for pairing devices. Finally, the DS28E81+ employs a PUF (physically unclonable function) that creates a unique challenge-response authentication system by generating a single-use random node-specific identification number.

Application fields

The DS28E81+ secure memory device can be used in several application fields that require secure authentication and key storage. For example, the device can be used to securely store access control keys in industrial systems, as well as secure industrial IoT applications such as smart metering, healthcare systems, and supply chain management. In automotive security systems, the device can be used to securely store radio key functions and other important access control functions. Finally, the device can be used in connected device applications, such as home automation, camera systems, and other related systems, in order to securely store device access keys.

How it works

At its core, the DS28E81+ secure memory device works by digitally signing specific keys stored on the device, which prevents digital tampering or unauthorized access. Once the digital signature is applied to the keys, the digital signature acts as an authentication code that ensures the integrity of the stored keys. Additionally, the keys are stored using a strong 128-bit AES encryption algorithm, which makes it virtually impossible to decipher the key data without the correct digital certificate.

In addition to encrypting the stored key information, the DS28E81+ also employs a SHA-256 hashing algorithm to ensure the secure transfer of data between devices and a physically unclonable function to generate a node-specific identification number. This helps to ensure that if any changes are made to the stored key data, they can be detected. Finally, the DS28E81+ also includes an onboard protocol for securely pairing devices.

Conclusion

The DS28E81+ secure memory device from Maxim Integrated provides a cost-effective solution for securely storing and validating key information in embedded systems. By providing an AES-based encryption system and SHA-256 hashing algorithm, the device ensures that ciphertext cannot be deciphered without the correct digital certificate, while also providing a physically unclonable function to generate a node-specific identification number. Furthermore, its secure protocol for pairing devices helps to prevent malicious tampering and communication between devices. As a result, the DS28E81+ is well-suited for a variety of secure application designs, such as access control, industrial IoT, and automotive security systems.

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