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Encryption of Stored Data

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Print Controller Design Guide for Information Security 1-7-2 Encryption of Stored Data Overview By encrypting the data stored in the HDD, NVRAM, and flash ROM memories, it is possible to prevent the leakage of the contents of the data, even in the event the encrypted data were stolen. The encryption applies to active data (data still in use), as well as data which remains in memory but for which the page location data has been erased (as described in 1.7.1 above). There are three data storage keys, one for each of the storage media mentioned above. These keys are protected using a mother encryption key, which is stored on the TPM. Access to these storage keys is granted only if the controller core passes the Trusted Boot validation process explained in section 1.4.2 above. This eliminates the possibility of illegal system programs accessing any of the customer's personal data stored on these media. Storage Media As mentioned above, the encryption of stored data applies to three MFP/LP storage media: HDD, NVRAM, and flash ROM memory. This function is provided to the field as an option for HDD and NVRAM memory, and requires a license installation before it can be used. For MFP models, a field engineer must perform the installation of the license and option. If an HDD containing encrypted data is removed from one MFP/LP and then installed on another, it will not be possible to decrypt any of the data on the HDD, including the format management data. This is because the encryption keys used to encrypt the data would be different. In such a case, the MFP/LP will recognize the drive as "unformatted". The function can be enabled/disabled in UP mode. As the function is always enabled for flash ROM data, this Enable/Disable setting applies only to the HDD and NVRAM. When the function is enabled, the following data are encrypted: NVRAM: All data, except the engine adjustment parameters and some Copier screen display parameters (i.e. personal information, network configuration parameters, and other confidential information) HDD: All data, including the format management data Flash ROM: As mentioned above, the following data is always encrypted, regardless of whether the function is enabled or disabled. The machine identification certificate for HTTPS communication The machine identification certificate for the Wireless LAN (WPA) The machine identification certificate for the S/MIME signature The machine identification certificate and site identification certificate for IPSec The server authentication key for SSH The machine identification certificate and site identification certificate for @Remote Page 29 of 86

Section	Page
04/23/2010	1
For these details, please refer to the Operating Instructions for the specific machine in question.	6
Hardware Configuration	7
MFP	7
LP	9
TPM (Trusted Platform Module): When the MFP/LP main power is turned on, this security module (chip) performs a verification on the validity of the software installed on the hardware platform, which includes checking for any illegal alterations.	10
Shared Service Layers	11
Principal Machine Functions	12
Data Security	14
External I/F	14
Protection of Program Data from Illegal Access via an External Device	14
IC card-based authentication functions: Authentication is mutual and encrypted, which prevents impersonation and ensures that data is properly protected.	16
Firmware Installation/Update	17
Remote Firmware Installation via Web SmartDeviceMonitor Professional IS (performed by the end user)	19
Verification of Firmware/Program Validity	20
Note: Produced by STMicroelectronics, TPM is a product of the ST19WP18 family, which has earned Common Criteria certification (EAL5+).	20
Authentication	21
IC Card Authentication	24
Access Control	25
In addition, it is possible to create an access control list (ACL) for each individual Address Book entry and Document Server document at both the individual user and group levels.	25
If the MLP/LP is initialized in this way, all of the user information, document data, and settings stored in the MLP/LP since installation will be initialized (erased).	26
Data Erase/Overwrite	27
To execute the overwrite, the operator can choose from two options: \	28
The execution of this feature does not clear engine-related information such as the value of the total counter, or engine-related adjustment settings contained in SP mode and UP mode.	28
Through this arrangement, the copy of the HDD storage key is automatically decrypted once the Encryption Key Restore has been completed.	31
Document Server Documents (MFP models only)	33
Access Privileges and Operations for Stored Documents	34
Without HDD: 500 entries	38
Overview of Capture Operations	39
Operations that Generate Captured Images	39
Capture Settings	41
Security Considerations	42
Captured Documents and Log Data	42
Additional Methods for Increased Security	42
(Authentication not required)	42
Copier (MFP Models Only)	43
Overview of Copier Operations	43
Data Security Considerations	43
Protection of Copy Jobs in Progress	43
Protection of Document Server Documents	43
Refer to 1.7.2 Document Server Documents (MFP models only) for details on the Document Lock feature.	44
Restricting the Available Functions for Each Individual User	45
Job/Access Log Data Collection	45
Print Backup	45
(printing out, editing, copying).	46
Overview of Printer Operations	47
Data Flow	47
Data Security Considerations	51
The \	53
Overview of Scanner Operations	54
Data Flow Security Considerations	54
Protection of Data when Performing Scanning and Sending Operations	55
Protection of Document Server Documents	56
Protection of Sending Results and Status Information	57
Protection of the Scanner Features Settings	57
Data Stored in the Job Log	58
Terminology	58
FTP (File Transfer Protocol): A protocol used when transferring files over a TCP/IP network.	58
Overview of FAX operations	59
Data Security Considerations	60
Protection of the Journal and Documents in Document Server Storage	61
Protection of FAX Transmission Operations	61
Protection of FAX Features Settings	62
The \	62
Job Log	62
Protection of Internet FAX Transmissions using S/MIME	62
Preventing FAX Transmission to Unintended Destination(s)	63
This prevents a FAX from being sent to an unintended destination when, for example, the operator accidentally touches an additional Quick Dial key.	63
Overview of NetFile Operations	64
Data Flow	65
Supplementary	65
Network Topology for a System Using Integration Server Authentication (Sample)	66
As long as the track ID is not stolen from the communication path between the PC and MFP/LP (which can be protected against by enabling SSL encryption) or from the PC itself, it is impossible to perform any unauthorized operations on these print jobs	68
Web Server Framework	69
WebDocBox (MFP models only)	70
For more details on job and access logs, please refer to 1.9 Job/Access Logs.	72
@Remote	73
Overview of @Remote Operations	73
Data Security Considerations	73
Security is increased even further by the fact that the symmetric key used is not a static key, but rather one that is generated every time a new session is initiated.	73
Overview of Copy Data Security Operations	74
Data Flow	75
Following this, an entry for the event itself is stored in the access log, along with the username.	75
Overview of Operations	77
1	77
Overview of SDK Application Functions	79
3: DSDK Œ MFP/LP Hardware Configuration	79
Scanning Functions: Sending Data Over the Network with the Copier and Scanner (MFP models only)	80
FAX Functions (MFP models only)	80
Network Functions	81
Printer Functions	81
Machine Administrative Functions (MFP models only)	81
Authentication Functions	81
Data Security Considerations	83
Preventing the Installation of Illegal Applications	83
Authentication of SDK Applications at Installation	83
Prevention of Access to Address Book Data and Machine Management Data	85
Protection Against Attacks on Principal MFP/LP Functions, Prevention of Damage to the System	85
Protection Against Attacks from External Sources	85

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Print Controller Design Guide for Information Security

Page 29 of 86

1-7-2 Encryption of Stored Data

Overview

By encrypting the data stored in the HDD, NVRAM, and flash ROM memories, it is possible to prevent

the leakage of the contents of the data, even in the event the encrypted data were stolen. The

encryption applies to active data (data still in use), as well as data which remains in memory but for

which the page location data has been erased (as described in 1.7.1 above).

There are three data storage keys, one for each of the storage media mentioned above. These keys

are protected using a mother encryption key, which is stored on the TPM. Access to these storage

keys is granted only if the controller core passes the Trusted Boot validation process explained in

section 1.4.2 above. This eliminates the possibility of illegal system programs accessing any of the

customer’s personal data stored on these media.

Storage Media

As mentioned above, the encryption of stored data applies to three MFP/LP storage media: HDD,

NVRAM, and flash ROM memory. This function is provided to the field as an option for HDD and

NVRAM memory, and requires a license installation before it can be used. For MFP models, a field

engineer must perform the installation of the license and option.

If an HDD containing encrypted data is removed from one MFP/LP and then installed on another, it will

not be possible to decrypt any of the data on the HDD, including the format management data. This is

because the encryption keys used to encrypt the data would be different. In such a case, the MFP/LP

will recognize the drive as “unformatted”.

The function can be enabled/disabled in UP mode. As the function is always enabled for flash ROM

data, this Enable/Disable setting applies only to the HDD and NVRAM. When the function is enabled,

the following data are encrypted:

NVRAM: All data, except the engine adjustment parameters and some Copier screen display

parameters (i.e. personal information, network configuration parameters, and other confidential

information)

HDD: All data, including the format management data

Flash ROM: As mentioned above, the following data is always encrypted, regardless of whether

the function is enabled or disabled.

The machine identification certificate for HTTPS communication

The machine identification certificate for the Wireless LAN (WPA)

The machine identification certificate for the S/MIME signature

The machine identification certificate and site identification certificate for IPSec

The server authentication key for SSH

The machine identification certificate and site identification certificate for @Remote