Understanding Sharing

1Password 4.2 for iOS has been released with a really nifty sharing feature. This allows you to conveniently share items with other people and keep them updated. Before getting into the details, it is important to know that the data is well encrypted within 1Password, but it is not encrypted when it is not in […]

Guess why we’re moving to 256-bit AES keys

1Password is moving to using 256-bit AES keys instead of 128-bit keys. We already started this within the browser extensions in the summer of 2011, and the new Cloud Keychain Format also uses 256-bit keys. Why do you think we are making this move? If your answer is because AES 256 is stronger than AES […]

Authenticated Encryption and how not to get caught chasing a coyote

I introduced HMAC (Hash-based Message Authentication Code) through the back door when talking about the Time-based One Time Password (TOTP) of Dropbox’s two-step verification. But TOTP is actually a peculiar way to use HMAC. Let’s explore what what Message Authentication Codes (MACs) are normally used for and why they play such an important role in […]