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recipient(s
I've just got an interesting idea about how a malicious e-mail sender
could try to get a unseen by the recipient reading confirmation,
including the IP address of the recipient. I was working on S/MIME
messages and I thought about the signature validation process, where
some of the steps could require external information (like a CRL) to
be accessed. The interesting part of it is that the location of this
information can be included in the message itself, as the PKCS#7
package can also include the certificate used to generate the
signature.
> a.k.a. c0d3r/c0d3rZ/corelanc0d3r on various forums
> ____________________________________________________
>
>
>
> This transmission is intended only for use by the intended recipient(s). If you are not an intended recipient you should not read, disclose, copy, circulate or in any other way use the information contained in this transmission. The information contained in this transmission may be confidential and/or privileged. If you have received this transmission in error, please notify the sender immediately and delete this transmission including any attachments.
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designed to secure e-mail communications without the need for a
Public Key Infrastructure (PKI) or special agents on receiving
systems. When an e-mail message is targeted for encryption, the PXE
encryption engine on an IronPort e-mail gateway encrypts the original
e-mail message as an HTML file and attaches it to a notification
e-mail message that is sent to the recipient. The per-message key
used to decrypt the HTML file attachment is stored on a local
IronPort Encryption Appliance, PostX software installation or the
Cisco Registered Envelope Service, which is a Cisco-managed software
service.
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