Excel Secucard S300
Our wallet review process
We examine wallets starting at the code level and continue all the way up to the finished app that lives on your device. Provided below is an outline of each of these steps along with security tips for you and general test results.
Application build test result
The Excel Secucard S300 Display card finds its origins as a secure authentication card for various purposes. It can be used as a secure means for identification prior to its usage as a cryptocurrency wallet. It has a 256x256 E-Ink display screen and 13-key keypad.
eSecuCard Display Card is the newest smart Java card on the market which supports big E-ink display screen. It can display images, QR codes and texts. Embedded with Secure Element and a Real-Time-Clock chip, the super smart card provides a great platform for users to develop various applets based on smart card usage scenarios, such as bitcoin wallet for cold storage and payment, membership card, password vault, employee card, electronic ticket card and etc.
One of Excel Secu’s other products, previously reviewed here has a striking resemblance:
Product Specification Sheet:
- Java platform for users to develop multiple applet
- Compatible with Java Card v3.0.4 and GP v2.2.1
- ISO 7816, ISO 14443 and Bluetooth communication interface
- EPD screen and low energy consumption
- Extended API allows applet to control keypad and display
The product specification sheet also mentions that it supports the following algorithms:
- MD5, SHA1, SHA256, SHA384, SHA512
- DES, 3DES, TDES AES128
- RSA1024, RSA2048, RSA4096*, ECDSA (SECP256K1, SECP256R1, SECP384), ECDH (SECP256K1, SECP256R1, SECP384)
The card is also described as having a secure element.
We could not find any documentation on how the Excel Secucard S300 specifically functions as a bitcoin wallet. Although the technical specifications for the card itself are detailed in its product specification sheet, we discovered that Excel Secu had other products that are similar iterations of the card. Excelsecu seems to be a business-to-business manufacturer with general marketing directed towards other sellers. Thus, a consumer who wants to buy a bitcoin hardware wallet would not find information such as how the private key is handled on the device. We assume that it would be another party or business which would program hardware wallet capabilities.
Our main products includes PKI Digital signature token, One-Time-Password OTP token, FIDO U2F Security Key, Smart Card, Java card, Bluetooth Card, Display Card, Bitcoin cryptocurrency hardware wallets, smart wearable devices.
What We Do Know
- The product is marketed as a bitcoin hardware wallet albeit with sparse documentation
- It has both input and output interfaces suitable for generating a QR code.
- It claims to have a secure element
- We could not find a companion app
We have no way of knowing how the private key is stored and could not find any linked publicly available source code. We also could not find tutorials or relevant reviews. Assuming that we take their word for it that the device is indeed a bitcoin hardware wallet and functions as such, and without knowledge whether the private keys are created during the manufacturing process, we can only make an educated guess for the verdict.
Tests performed by Daniel Andrei R. Garcia
Do your own research
In addition to reading our analysis, it is important to do your own checks. Before transferring any bitcoin to your wallet, look up reviews for the wallet you want to use. They should be easy to find. If they aren't, that itself is a reason to be extra careful.