6 www.hp.com HP ProtectTools Embedded Security Guide
HP ProtectTools Embedded Security
Digital Signature
A digital signature displays the name of the CA issuing the digital
certificate. It is used to:
■ verify the identity of the sender of a digital document.
■ certify that the contents were not modified after the sender
digitally signed the document.
For more information on digital signatures, refer to the operating
system online Help.
Public Key and Private Key
Asymmetric cryptography, which is a method used by Embedded
Security to encrypt information, requires the use of 2 keys, a public
key and a private key.
A public key can be freely distributed to many users, whereas a
private key is held by only one user.
For example, to send encrypted email, User A would use the public
key (freely available) from User B to encrypt the contents of the
email sent to User B. Since User B has sole possession of his private
key, he is the only one that can decrypt the contents of the email sent
from User A.
Public key-enabled technology allows you to transmit private
information over public networks, use digital signatures to ensure the
authenticity of your email, and provides authentication between a
server and a client.
Emergency Recovery
The Emergency Recovery Archive, created by the administrator
during Embedded Security setup, is a file that stores sensitive
information about the computer, its users, and the private keys used to
protect encrypted or private data. In the case of a system failure, this
sensitive information is required to restore access to protected data.
An Emergency Recovery Token, also created by the administrator
during Embedded Security setup, is a file that stores the keys used to
protect the data in the Emergency Recovery Archive. The token is
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