Word Add-In: Visual Verified for signed/encrypted document

Motivation

a word add-in, use common-API and Word-API to:

1 calculate in page paragraph hash merk-trees 2 represent in QR code and insert base64 img/finger prints to each page and master node page 3 can verify in page - data/finger prints paras(utf-8 coding) in page --> page hash(img/finger prints hex) page hashes --> document hash(img/finger prints hex)

How dose it work

ECC sig:

64 bytes For example, for 256-bit elliptic curves (like secp256k1 ) the ECDSA signature is 512 bits (64 bytes) and for 521-bit curves (like secp521r1 ) the signature is 1042 bits.```

QR code size:

406 bytes A 101x101 QR code, with high level error correction, can hold 3248 bits, or 406 bytes. Probably not enough for any meaningful SVG/XML data. A 177x177 grid, depending on desired level of error correction, can store between 1273 and 2953 bytes.

visual-verifier dev notes

Source: yeoman generator

cd visual-verifier

npm start PS: need a PS command turn on web settings ? add later

deps

npm:

qrcode merkletreejs merkle-tools