Security Function (Encryption Key, Certificate And Protection Of Password) - Canon imageRUNNER ADVANCE C3330 Series Service Manual

● Complete Deletion of Hard Disk Data
When copying, sending, receiving and printing, the machine separates the job data to save in the management information area
and the actual data area. When a job is completed, the management information is automatically deleted, but the actual data
remains on the hard disk.
The actual data remaining on the machine's hard disk is completely deleted by overwriting zero data or random data. This is
effective for preventing data leakage when replacing or disposing of the hard disk.
When the Data Erase Kit is enabled, unneeded or deleted data in the hard disk can be completely deleted. The timing and mode
for deleting the hard disk can be selected.
The data completely deleted from the hard disk is as follows:
• Temporary image data generated at scanning
• Data remaining after files in the reception tray (Confidential Fax Inbox/Memory RX Inbox) are deleted
• Data sent/received to/from Fax/I-Fax
• Spool data
• Data temporarily saved as print data
● Initialize All Data/Settings
Saved files and registered information are initialized.
Data saved in the machine such as files, information registered in the address book, job log information and so on can be deleted
(initialized).*
CAUTION:
"Initialize All Data/Settings" is intended to be performed by the user mainly when disposing of the machine. As the purpose
of this function is different from that of complete deletion of job data, user management information will also be deleted;
therefore explanation to users is necessary.
* Details will be explained in the section of TPM.
Security Function (Encryption Key, Certificate and Protection of
Password)
■ Overview
A PCB called "TPM PCB" is installed on the machine's Main Controller PCB. TPM, which is an abbreviation for "Trusted Platform
Module", is a name of a chip that has a function for generating and saving the encryption key as well as public-key encryption
arithmetic function.
The TPM PCB protects security information (passwords, certificates and encryption keys) stored in the Flash. It does not protect
the setting/registered/saved data other than security information.
Encryption and decryption of security information use the TPM key within the chip.
Job Data
If data is erased by
normal procedure
Management Management
Information Information
Actual Data Actual Data
Management
If data is erased with
Information
the Data Erase Kit
Actual Data
Erase only management
data after output
Actual data remains
Actual Data
in the hard disk
0 Data or randam data
is overwritten after every output
Erase remaining
job data
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2. Technology