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Message-ID: <s0a22b06.089@mail.smuht.nwest.nhs.uk>
From: Marek.Isalski at smuht.nwest.nhs.uk (Marek Isalski)
Subject: leaking

>>> Dave Horsfall <dave@...sfall.org> 12/05/2004 13:13:07 >>>
> Unless you have a cryptographically-secure way of generating new email
> addresses, you will not have proved anything.

One of the interesting things I did when tweaking something on a website was to include a piece of code which does exactly that.

Each visitor is given a different email address.  It's made up of their IP address, the Unix time and a partial hash value, encrypted with a private Serpent-256 key.

Decrypting those addresses has been interesting.

Regards,

Marek Isalski
Software Support and Data Security Manager
Software Support, IT Projects, Directorate of Health Informatics
Wythenshawe Hospital, South Manchester University Hospitals NHS Trust