cipherseed
128bit entropy
1 byte header unencrypted 5 byte unencrypted pbkdf2-salt 3 byte header encrypted (1 bit version, 15 bit birthday, 8 bit type) 16 byte encrypted entropy <<<<<<< Local Changes 4 byte primary MAC tag (tag covers salt || encrypted header || encrypted entropy) 4 byte secondary MAC tag (tag covers salt || encrypted header || encrypted entropy) = Total 33 bytes
4 byte primary MAC tag 4 byte secondary MAC tag = Total 33 bytes (== 264 bits ~== 24 word mnemonic ~== 53 base32 chars without checksum)
External Changes
256bit entropy
1 byte header unencrypted 5 byte unencrypted pbkdf2-salt 3 byte header encrypted (1 bit version, 15 bit birthday, 8 bit type) 32 byte encrypted entropy <<<<<<< Local Changes 4 byte primary MAC tag (tag covers salt || encrypted header || encrypted entropy) 4 byte secondary MAC tag (tag covers salt || encrypted header || encrypted entropy) = Total 49 bytes
4 byte primary MAC tag 4 byte secondary MAC tag = Total 49 bytes (== 392 bits == 36 word mnemonic == 79 base32 chars without checksum)
External Changes
Fields 1 byte header unencrypted: allows to upgrade encryption scheme 5 byte unencrypted pbkdf2-salt