“SeedSigner is unique because it allows users to generate this entropy manually using two distinct methods, rather than relying solely on a digital random number generator:
•Camera Method: The device captures visual entropy from a photo taken with its camera. It combines data from the image, previous frames, the Raspberry Pi Zero's unique serial number, and the system's uptime to generate the random number
•Dice Method: Users roll a physical six-sided die to input entropy manually. To achieve 128 bits (12 words), you must roll the die 50 times. To achieve 256 bits (24 words), you must roll it 99 times.
The device follows the BIP-39 standard, where each word represents 11 bits of data. The final word in the phrase includes a checksum derived from the entropy to ensure the phrase is valid. While 128 bits is generally considered sufficient for current security needs, the SeedSigner defaults to recommending the 256-bit (24-word) option for maximum future-proofing and resistance against potential brute-force attacks.”
