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tpm_clear(8) [debian man page]

tpm_clear(8)						      System Manager's Manual						      tpm_clear(8)

							    TPM Management - tpm_clear

NAME
tpm_clear - return the TPM to the default state (unowned, disabled, inactive) SYNOPSIS
tpm_clear [OPTION] DESCRIPTION
tpm_clear requests that the system's TPM perform a clear (via the TPM_OwnerClear API) wiping out all ownership information, in effect invalidaing all keys and data tied to the TPM, as well as disabling and deactivating the TPM. This operation will prompt for the owner password. The --force option relies on Phyiscal Presence to authorize the command (via the TPM_ForceClear API) skipping the owner password prompt. The TPM OwnerClear API can be disabled until the current owner is cleared, requiring use of the --force with tpm_setclearable command. The TPM_ForceClear API can be disabled for the current boot cycle with the tpm_setclearable command. This command requires a reboot to complete the operation. -h, --help Display command usage info. -v, --version Display command version info. -l, --log [none|error|info|debug] Set logging level. -u, --unicode Use TSS UNICODE encoding for passwords to comply with applications using TSS popup boxes -f, --force Rely on Physical Presence for authorization; therefore, do not prompt for owner password. -z, --well-known Authenticate using 20 bytes of zeros as owner password (the default TSS Well Known Secret), instead of prompting for an owner password. SEE ALSO
tpm_version(1), tpm_takeownership(8), tpm_setclearable(8), tpm_setactive(8), tpm_setenable(8), tcsd(8) REPORTING BUGS
Report bugs to <trousers-users@lists.sourceforge.net> TPM Management 2005-05-05 tpm_clear(8)

Check Out this Related Man Page

tpm_setclearable(8)					      System Manager's Manual					       tpm_setclearable(8)

							TPM Management - tpm_setclearable

NAME
tpm_setclearable - disable TPM clear operations SYNOPSIS
tpm_setclearable [OPTION] DESCRIPTION
tpm_setclearable reports the status of the TPM's flags regarding how the TPM can be cleared. This is the default behavior and also accessible via the --status option. Requesting a report of this status prompts for the owner password. The --owner option requests that the TPM disable clear operations (via the TPM_DisableOwnerClear API) disabling the owner from clearing out the ownership information. This operation prompts for the owner password. This operation is in effect until the current owner is cleared. The --force option (via the TPM_DisableForceClear API) disables using Phyiscal Presence to authorize a clear operation. This operation does not require authorization and will skip the owner password prompt. This operation is only in effect until a reboot. -h, --help Display command usage info. -v, --version Display command version info. -l, --log [none|error|info|debug] Set logging level. -u, --unicode Use TSS UNICODE encoding for passwords to comply with applications using TSS popup boxes -s, --status Report the status of flags regarding how the TPM can be cleared. -o, --owner Disable use of owner authorization for authorizating a clear operation until a new owner exists. -f, --force Disable use of Physical Presence for authorizating a clear operation until a reboot has occurred. -z, --well-known Authenticate using 20 bytes of zeros as owner password (the default TSS Well Known Secret), instead of prompting for an owner password. SEE ALSO
tpm_version(1), tpm_takeownership(8), tpm_clear(8), tcsd(8) REPORTING BUGS
Report bugs to <trousers-users@lists.sourceforge.net> TPM Management 2005-05-05 tpm_setclearable(8)
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