Secure iButton
| Project Secure iButton | |
|---|---|
| Status | Initializing |
| Contact | User:Bertrik Sikken |
| Last Update | 2012-12-29 |
This project is about investigating and using the secure features of the iButton that people currently use for physical access to RevSpace.
Planned project phases are:
- phase 1: investigate possbilities of the iButton and experiment with it
- phase 2: write software for the iButton functionality and package it into a library
- phase 3: apply knowledge and software for application within RevSpace
iButton investigation
The iButton used at RevSpace is the !DS1961, with the following features
- 4 pages of 32-byte user data each
- an 8-byte "secret"
- SHA-1 algorithm that can calculate a hash over a 32-byte user data page, the 8-byte secret, a 3-byte "challenge" and the unique iButton id.
Basically authentication could work like this:
- user presents iButton to the reader
- reader reads the unique iButton id
- ...
DS1961 library
This library provides an API for the DS1961 specific functions. It will be targeted at the Arduino microcontroller, to run on top of the existing 1-wire library.
Application
We could apply this to improve the security of RevSpace access.