> Think about the size of a reasonable cryptographic public key; would it be nice to have it optically readable sometimes?
An ECDSA key would be 256 bits or 32 bytes long. At low error correction, it can fit into QR Code version 2 (21×21 modules). Or if you're thinking of RSA, then a 2048-bit key would fit in version 10 (57×57).
An ECDSA key would be 256 bits or 32 bytes long. At low error correction, it can fit into QR Code version 2 (21×21 modules). Or if you're thinking of RSA, then a 2048-bit key would fit in version 10 (57×57).