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Internet Explorer 8 encrypts form autocomplete passwords and stores them in the Registry at HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\IntelliForms. I understsand that the URL of the site is used in the encrption process.

Does anyone know what the encryption mechanisn is - 3DES?

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Why is it that you are asking? – squillman Aug 15 '12 at 12:05
Thanks but this only points out where the settings are held, not what the encryption algorithm is – Matt Aug 16 '12 at 13:39
Why am I asking? Because at my company someone is able to save passwords and our security people want to know ;-) – Matt Aug 16 '12 at 13:40

Found the answer: it's 168bit 3DES. Blog post with full details here.

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