To access Nubank's SFTP server, a Private Key is required. Also, the corresponding Public Key must be sent to Nubank.
No data is sent to the server, everything happens in the browser.
The Private Key is similar to a password, but in the form of a file.
Download and store it securely. DO NOT SHARE OR SEND the Private Key!
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Public Key
Download the Public Key and send it to Nu.
Some text editors and mail clients may add unwanted characters and formatting that invalidate the key. Prefer attaching the public key file instead of copying its contents when sending it.