Cryptographic Capabilities

The Cryptnox Basic Wallet Card supports a broad range of cryptographic functions for blockchain signing, enterprise authentication, and key derivation.

It operates on both secp256k1 and secp256r1 elliptic curves, maintaining independent key derivation trees for each. The hierarchical deterministic wallet structure supports up to eight levels of derivation depth as defined in BIP32 (for secp256k1) and SLIP10 (for secp256r1).

The card supports multiple signature schemes, including ECDSA (DER-encoded with canonical low-S enforcement), EOSIO-compatible ECDSA, and BIP340 Schnorr signatures for Bitcoin use cases.

For symmetric cryptography, the card uses AES-256 CBC for data encryption and AES-256 CMAC for message integrity. Key derivation follows the HMAC-SHA512 standard used in BIP32 and SLIP10.

These capabilities allow the card to act as a secure signing device for both blockchain transactions and enterprise-level cryptographic operations.