At HelloSign, each of your documents is stored behind a firewall and authenticated against the sender’s session every time a request for that document is made. All communications use SSL (Secure Sockets Layer) encryption and all data is stored in a SOC 1 Type II, SOC 2 Type I, and ISO 27001 certified data center. Your documents are stored and encrypted at rest using AES 256-bit encryption.
In addition, each document is encrypted with a unique key. As an additional safeguard, each key is encrypted with a regularly rotated master key. This means that even if someone were able to bypass physical security and access a hard drive, they wouldn’t be able to decrypt your data.