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A cryptocurrency wallet’s security depends entirely on the private key used to authorize transactions. If malware or an attacker gains access to this private key, they may transfer the associated assets without the owner’s permission. Crypto Java Card mitigates this risk by storing cryptographic keys in a Secure Element and performing signature operations on the […]
When comparing Java Card memory requirements during procurement, the maximum memory values listed in the datasheet may not be the most useful metric. Chip specifications may list different memory resources, such as EEPROM, Flash, RAM, and user memory; however, because these terms refer to different resources, you often can’t compare them directly across products. For […]
A custom Java Card project treats the smart card as a controlled application platform, rather than simply loading multiple applets onto the same chip, thereby supporting the execution of multiple applications. Each applet should have its own independent security context, data, credentials, and access rules; shared services should be explicitly designed rather than assumed by […]
When choosing between the three 13.56 MHz RFID chip—MIFARE, DESFire, and ICODE—you should first consider the specific application of the card, rather than focusing solely on the fact that they all operate at 13.56 MHz. In procurement, the term “MIFARE” typically refers to MIFARE Classic, while DESFire itself is a higher-security branch of NXP’s MIFARE […]
Yes, they can support both cryptocurrency wallet signing and FIDO2 authentication. As long as they have sufficient storage space, the necessary cryptographic algorithms, an appropriate FIDO2 transmission mechanism, and a lifecycle architecture that keeps the two applications independent, a Java Card crypto card can fully support both cryptocurrency wallet signatures and FIDO2 authentication on the […]
A Java Card Applet may run normally on one chip but fail on another. This usually doesn’t mean Java Card technology lacks portability. More often, the application depends on a specific combination of Java Card version, CAP file format, imported APIs, cryptographic algorithms, memory resources, GlobalPlatform configuration, or chip-specific features. As a result, migration may […]
When selecting a payment Java Card for a dual-interface banking project, base the decision on the overall payment architecture. The card must support the required contact and contactless protocols, payment applications, encryption features, the GlobalPlatform environment, personalized data, and target certification configurations, while ensuring consistent transaction behavior across both interfaces. We recommend following this selection […]
When selecting a Java Card chip to support multiple mini-programs for government-issued ID cards, start with the complete application architecture rather than focusing solely on storage capacity or chip brand. First, identify all the mini-programs the card must support, estimate the required persistent storage and working memory (RAM), determine the necessary encryption algorithms, plan how […]
To avoid duplicate credential IDs on a 125kHz proximity card, simply printing different numbers on the card surface is not enough. First, define the credential format used by the access control system and assign non-overlapping ID ranges. Then encode each card using a controlled production database. Before writing data, we must verify the uniqueness of […]
Choosing an algorithm is first and foremost a compatibility decision, followed by performance considerations. When choosing between ECDSA and Ed25519 for a Java Card crypto card, the first question is: Which signature algorithm does the target blockchain or wallet protocol require? Both ECDSA and Ed25519 are elliptic curve digital signature algorithms, and when properly implemented, […]