12-16-2014
Quote:
Originally Posted by
jim mcnamara
The point is not any of the above. Where do you store the key to decrypt the half-key?
This is a logical fallacy. It is called circular reasoning. I need a key to decrypt a key. I still have to store that secondary key somewhere, or the system will have to regenerate it. Regenerate means I can see it in the source. Storage means it is a sitting duck, unencrypted.
If you agree it's a fallacy, then what
were you suggesting with:
Quote:
...the half-keys should be encrypted - both on the user side and the system side.
Unless your point was simply that you shouldn't keep them around indefinitely in retrievable form -- and I don't. I don't encrypt them though, just delete them at regular intervals, as the session times out.
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LEARN ABOUT DEBIAN
tpmtoken_protect
tpmtoken_protect(1) General Commands Manual tpmtoken_protect(1)
TPM Management - tpmtoken_protect
NAME
tpmtoken_protect - encrypt or decrypt data using a symmetric key stored in the user's TPM PKCS#11 data store
SYNOPSIS
tpmtoken_protect [ OPTION ]
DESCRIPTION
tpmtoken_protect will encrypt or decrypt data using a symmetric key that is stored in the user's data store. The key used to protect the
data is a 256-bit AES key stored as a private Secret Key PKCS#11 object. The object has the PKCS#11 label attribute of 'User Data
Protection Key'. The key is generated by the TPM PKCS#11 implementation when it is needed the first time. Since it is generated as a
private object, it is protected by the TPM on the platform.
This command requires the '-i' and '-o' command options to be specified.
-h, --help
Display command usage info.
-v, --version
Display command version info.
-l, --log [none|error|info|debug]
Set logging level.
-d, --decrypt
Perform a decryption operation
-e, --encrypt
Perform an encryption operation
-i, --infile FILE
Use FILE as the input to the specified operation
-k, --token STRING
Use STRING to identify the label of the PKCS#11 token to be used
-o, --outfile FILE
Use FILE as the output of the specified operation
SEE ALSO
tpmtoken_init(1), tpmtoken_import(1), tpmtoken_setpasswd(1), tpmtoken_objects(1)
REPORTING BUGS
Report bugs to <trousers-users@lists.sourceforge.net>
TPM Management 2005-04-25 tpmtoken_protect(1)