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Ricoh Aficio SP C820DNT1 Design Guide - Page 53

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Print Controller Design Guide for Information Security • The language processing system is only capable of processing legal data in pre-defined formats. Therefore, even in the case that illegal fonts or firmware were downloaded to the MFP/LP on-board memory, such data could not be executed as a program nor be processed by any of the MFP/LP's internal modules. Printing Encrypted Image Data As stated above, PDF Direct Print handles the sending of encrypted PDF files. The main use of this function is for sending encrypted PDF files in cases where it is not possible to encrypt the communication path itself. Once the password for opening the file has been programmed from the MFP/LP operation panel or from WebImageMonitor, it is possible to then safely send the printing data over the communication path. Even if the PDF file sent as printing data were intercepted on its way to the MFP/LP, the contents of the data are secure since the data is already encrypted. As stated above, the password for opening the file can also be programmed from inside DeskTopBinder. Since this allows the user to assign unique passwords to each individual PDF file, this function can be used to distribute confidential documents. Since both the printing data and distributed PDF file itself are sent along the communication path in an encrypted state, their contents are secure. Even if the PDF file were intercepted at the PC or server point, the contents of the file cannot be accessed. In addition, the password itself is also protected since it is encrypted using the group password already programmed in DeskTopBinder. As stated above, the PDF interpreter cross-references the password programmed in the MFP/LP with the encrypted password sent from the PC, and destroys the incoming data when these passwords do not match. In addition, the incoming data is also destroyed if accompanying information alerts the MFP/LP that printing of this file is prohibited. Since the MFP/LP will reject such data, it is not possible for the data to introduce any illegal programs or be processed by any MFP/LP modules. Logs At the conclusion or cancellation of a job, the print results are stored in the job log in the HDD (for details on the job/access logs, see 1.8 Job/Access Logs). The "reason code" contained in the results allows the operator to distinguish between jobs that were cancelled due to failed authentication and all other reasons. Page 53 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 53 of 86

•

The language processing system is only capable of processing legal data in pre-defined formats.

Therefore, even in the case that illegal fonts or firmware were downloaded to the MFP/LP on-board

memory, such data could not be executed as a program nor be processed by any of the MFP/LP’s

internal modules.

Printing Encrypted Image Data

As stated above, PDF Direct Print handles the sending of encrypted PDF files. The main use of this

function is for sending encrypted PDF files in cases where it is not possible to encrypt the

communication path itself. Once the password for opening the file has been programmed from the

MFP/LP operation panel or from WebImageMonitor, it is possible to then safely send the printing data

over the communication path. Even if the PDF file sent as printing data were intercepted on its way to

the MFP/LP, the contents of the data are secure since the data is already encrypted.

As stated above, the password for opening the file can also be programmed from inside

DeskTopBinder. Since this allows the user to assign unique passwords to each individual PDF file, this

function can be used to distribute confidential documents. Since both the printing data and distributed

PDF file itself are sent along the communication path in an encrypted state, their contents are secure.

Even if the PDF file were intercepted at the PC or server point, the contents of the file cannot be

accessed. In addition, the password itself is also protected since it is encrypted using the group

password already programmed in DeskTopBinder.

As stated above, the PDF interpreter cross-references the password programmed in the MFP/LP with

the encrypted password sent from the PC, and destroys the incoming data when these passwords do

not match. In addition, the incoming data is also destroyed if accompanying information alerts the

MFP/LP that printing of this file is prohibited. Since the MFP/LP will reject such data, it is not possible

for the data to introduce any illegal programs or be processed by any MFP/LP modules.

Logs

At the conclusion or cancellation of a job, the print results are stored in the job log in the HDD (for

details on the job/access logs, see 1.8 Job/Access Logs)

. The “reason code” contained in the results

allows the operator to distinguish between jobs that were cancelled due to failed authentication and all

other reasons.