Written by Ezra Reguerra staff writer Edited by Yohan Yun staff editor

Trezor cited July’s Coldcard attacks, in which strong passphrases helped protect some users whose wallet recovery information was compromised.

Hardware wallet maker Trezor has increased the maximum length of optional wallet passphrases from 50 to 128 characters.

On Sunday, Trezor said the change is available in its Trezor Suite with updated device firmware. Older firmware still limits passphrases to 50 characters.

According to Trezor, a passphrase acts like an additional password that users set alongside their wallet’s recovery phrase. An attacker who obtains the recovery phrase would still need the correct passphrase to access funds in that wallet.

Trezor cited the Coldcard attacks in July , when a firmware flaw caused some devices to generate recovery phrases with insufficient randomness, allowing attackers to reconstruct them. Trezor said strong, unique passphrases protected some affected users.

On Friday, the company advised customers who bought wallets from former authorized reseller CryptoBilis since March to move their funds to new wallets .

An Indonesian customer reported a suspected implant inside a Trezor Safe 5 that could capture on-screen information, including recovery phrases, and transmit it over a cellular network. Trezor said Friday it had not examined the device and had received no reports of related losses.

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