AT.Walletlatest release: ?? last analysed 3rd December 2021 Leaks Keys
Help spread awareness for build reproducibility
Please help us spread the word discussing build reproducibility with AT.Wallet via their Twitter!
Do your own research!
Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.
The Analysis ¶
AT.Wallet describes itself as
One of The World’s First Fingerprint Credit Card Sized Cold Wallet.
You can set up this wallet with bluetooth or USB.
Its companion app is
Private keys can be created offline and are not shared
In the FAQ, this wallet states that it stores private keys offline.
If you keep your virtual assets on an exchange, you are entrusting your private keys to a third party and authorizing them as security. The cold wallet is unloaded so that hackers have a harder time accessing your stored coins for improved security. The private key is always offline and stores inside SE (Secure Element), all paths are encrypted.
Once paired to the mobile app, the user can create a new wallet. The user will be provided with the 12/24-word mnemonic in the app and is asked to write them down offline, in a safe place.
For better security, you can assign “Passphrase” for those “Mnemonic words” for recovery, so that when you do “recover wallet base on Mnemonic words”, it requires you to type correct “Passphrase” to recover.
Device displays receive address for confirmation
The user can verify and approve transactions on the device.
The card has a built-in fingerprint sensor to sign transactions:
Patented Standalone Mode adds convenience for fingerprint verification and fast transaction signing.
Fingerprint verification is necessary for sending assets, but not for receiving.
AT.Wallet, like it claims in the earlier description, is about the size of a credit card. It lists some of its security features on its product page.
- Designed with Infineon Secure Element (SLE97, EAL 5+SE), that generates private key inside SE for security transactions.
- Matching-on-card fingerprint sensor, making fingerprint templates not disclose outside the card and only send out public key.
ATWallet has a Github profile, although there is no mention of its product being open-source. None of these repositories appear to be relevant in determining the reproducibility of the device’s firmware.
This product is thus not verifiable.
This product requires sharing private key material!
As part of our Methodology, we ask:Does the device share private keys? If not, we tag it Leaks Keys
Some people claim their paper wallet is a hardware wallet. Others use RFID chips with the private keys on them. A very crucial drawback of those systems is that in order to send a transaction, the private key has to be brought onto a different system that doesn’t necessarily share all the desired aspects of a hardware wallet.
Paper wallets need to be printed, exposing the keys to the PC and the printer even before sending funds to it.
Simple RFID based devices can’t sign transactions - they share the keys with whoever asked to use them for whatever they please.
There are even products that are perfectly capable of working in an air-gapped fashion but they still expose the keys to connected devices.
Share onTwitter Facebook LinkedIn
Or embed a widget in your website
<iframe src="https://walletscrutiny.com/widget/#appId=hardware/atwallet&theme=auto&style=short" name="_ts" style="min-width:180px;border:0;border-radius:10px;max-width:280px;min-height:30px;"> </iframe>
<iframe src="https://walletscrutiny.com/widget/#appId=hardware/atwallet&theme=auto&style=long" style="max-width:100%;width:342px;border:0;border-radius:10px;min-height:290px;"> </iframe>