The ATSHA204A - MAHDA - T is a high - security device from Microchip's CryptoAuthentication™ series.
1. Features
Robust Encryption
It utilizes the advanced SHA - 256 hashing algorithm, offering options like Message Authentication Code (MAC) and Hash - Based Message Authentication Code (HMAC).
Boasts a first - class 256 - bit key length and can store up to 16 keys, ensuring strong security for data and transactions.
Unique Identification
Comes with a guaranteed unique 72 - bit serial number, which can be proven authentic by the host system or remote server through the supported encryption protocols.
Versatile Interfaces
Supports multiple I/O options, including a high - speed UART - compatible single - wire interface and a 1 MHz I²C interface, providing flexibility in system integration.
Secure Storage
Equipped with a 4.5 kb EEPROM for storing keys and data, and 512 one - time programmable (OTP) bits for fixed information.
Random Number Generation
Incorporates an internal high - quality Random Number Generator (RNG), generating 32 - byte (256 - bit) random numbers that are independent of previous values, crucial for preventing replay attacks.
Power Management
Operates within a wide power supply voltage range of 2.0V to 5.5V and has a communication voltage range of 1.8V to 5.5V. It consumes less than 150 nA in standby mode.
2. Technical Parameters
Package Type: UDFN - 8L - EP (3x2)
Operating Temperature: - 40°C to + 85°C
Algorithm: SHA - 256, HMAC
Standby Current (Max): 150 nA
Memory Size: 4.5 kb
Key Size: 256 bit
Number of Keys: 16
3. Applications
Anti - Counterfeiting: Verify the authenticity of removable, replaceable, or consumable components like printer cartridges, electronic sub - cards, disposable medical supplies, or spare parts.
Firmware Protection: Ensure the integrity of firmware or media by verifying code stored in flash memory during startup to prevent unauthorized modifications, encrypt downloaded media files, and secure code images.
Session Key Exchange: Securely exchange data stream encryption keys used by encryption/decryption engines in system microprocessors for managing confidential communication channels and encrypted downloads.
Data Storage: Store confidential information keys used by encryption accelerators, as well as configuration, calibration, e - purse values, consumption data, or other small amounts of confidential data in a secure manner.
User Password Verification: Verify user - entered passwords without revealing the expected values, map simple passwords to complex ones, and securely exchange password values with remote systems.