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2. The third-party website contacts the authentication server requesting authentication for that address. To do so the third-party website generates a challenge string with a specific format and passes it to the authentication server. 3. The authentication server checks the Ethereum network for the current secondary address of the user. It then checks the internal database for the necessary data to contact the mobile device associated to that address. 4. The user receives a mobile push notification to confirm or deny the login request. 5. If the user accepts, the private key of the secondary address is used to sign the challenge. The signed challenge is then sent back to the authentication server. 6. The authentication server verifies the signature and if it is valid and the challenge matches, it considers the login successful. It then sends back the signed challenge to the third-party website for optional independent confirmation. That is all there is to it, really! This scheme separates the signature process from a sensitive primary address, preventing the exposure of a potentially important private key while still giving the third party site confirmation that the user is the rightful owner of that address. Furthermore, although it relies on the authentication server for convenience, it can still work without it and does not require trust to be placed in it (the third party website can check the signature itself). Thus it remains decentralized in worst-case scenarios (authentication server down) and convenient for the common case. As an added benefit, this system can easily be adapted to work like “Login with Facebook” or “Login with Google” do. In fact, a future version could be included in Auth0! 3.3.3 Cons As we have seen so far, our system appears to be more convenient than our initial, simple approach from part two of this series. However, it does come with a few limitations of its own. Let’s take a brief look at them. Our initial approach sported a key element from blockchain based systems: it was entirely decen- tralized. Our newer approach relies on an authentication server for convenience. Although it is possible for the system to work without the authentication server, it is not convenient to use it this way. This is by design and must be considered if convenient decentralized operation is mandatory in all cases. In every case, however, no trust is placed in the server. 3.4 Try it out! Since this is just a proof-of-concept and getting your feet wet with Ethereum can be a bit hard at first, here is a step by step guide for new users to test the system. Please note that this is just a test system so it uses Ethereum’s testnet. In other words, no hard guarantees are provided with regard to the integrity of the data stored in the Ethereum testnet, do not put important stuff in the accounts created in this guide, they won’t be protected by the same guarantees as the Ethereum mainnet. 60PDF Image | Intro to Ethereum and Smart Contracts
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