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NFC blocking sleeve for programmable tokens (mini cards)
NFC blocking sleeves lined with a metallic material that will block the NFC signal. Dimensions suitable for miniOTP cards / 64 × 38 mm
There isn't a way to extract the secret from the card, but it is theoretically possible to read the current OTP and the serial number. Although the risk of replay attacks is practically close to zero, you can physically isolate your programmable tokens by keeping them inside the NFC blocking sleeves.
Blog
04-04-2026
Understanding FIDO User Verification Modes and the always_uv Setting
Token2 R3.3 and later FIDO2 keys enforce user verification by default with always_uv = true, improving security, though some platforms and apps like Windows 10, macOS, and certain legacy clients may fail to handle this override correctly.
05-03-2026
Introducing TOTPVault — self-hosted TOTP management for teams
Most TOTP apps work by distributing copies of the secret to every person who needs access — fine for personal accounts, but for shared service accounts it means MFA secrets scattered across people's phones with no clean way to revoke access when someone leaves.
21-12-2025
Android, NFC, and the Missing Piece of WebAuthn
For years, Android users have faced a frustrating limitation—Android does not support CTAP2 over NFC. This means no PIN verification and no discoverable credentials (passkeys) when using NFC, and therefore limited to simple U2F-style flows without user verification. That said, there finally seems to be a solution.