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When I work with some bigger clients that have large IT departments, they always send me my login details via email. If my email was being watched by a nefarious type, they could easily gain access to sensitive data.

What would be a better way to share this kind of data with someone?

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up vote 8 down vote accepted

You could request that emails are PGP encrypted, requiring you to decrypt the email on your end.

The could create a password-protected Word or PDF file and email that to you as an attachment with a predetermined password that you discussed on the phone.

They could call you on the phone and you could write down the credentials in a secure password keeper like 1Password.

Another option may be to setup provide the person with an application that connects securely to a web service and uploads the data over an SSL connection.

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+1 for Public-key encryption using PGP – RedGrittyBrick Oct 25 '11 at 10:15
Remember that password protected word files do not protect against a brute force attack – Matt Wilko Oct 25 '11 at 13:57

For SFTP logins, you could send them your public SSH key so that they enable it, and you use no password at all, but only a passphrase which unlocks your key.

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