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Ricoh Aficio SP C821DNT1 Design Guide - Page 47

Printer, 2-1 Overview of Printer Operations, 2-2 Data Flow

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Print Controller Design Guide for Information Security 2-2 Printer 2-2-1 Overview of Printer Operations • The Printer function can be divided into main processes: 1) Converting the printer language data received by the MFP/LP into image data, and 2) Printing out this image data onto the paper in accordance with the specified job settings. The former is performed by the printer language processing subsystem, while the latter is performed by the printing subsystem. • Once the data sent from the host computer is accepted, and the processing subsystem begins processing the new print job, a print job log entry is created (temporary entry). The entry is registered as soon as the job is completed. Note: The Document Server and all related Printer functions described below are supported by MFP models only. 2-2-2 Data Flow Printing Unencrypted Image Data • As stated above, the printer language-encoded data sent from the host computer is interpreted by the language processing subsystem, after which it is converted into image data and then stored temporarily in the Page Memory in binary bitmap format. Once this is done, the data is compressed in Ricoh original compression format, and stored in the HDD page by page. If the MFP/LP does not have an HDD, the compressed data remains in the Page Memory and is treated the same as data written to the HDD. • When Spooling is enabled, the incoming data is stored directly to the spooling area of the HDD. Following this, the data is sent to the language processing subsystem, where it is interpreted and converted to image data page by page. Before it is printed out, the spooled data can be deleted from the "Spool Printing" list in WebImageMonitor, or "Spooling Job" list on the MFP/LP operation panel. The data is developed page by page in the order in which it was converted (beginning from page 1), however the actual printing order of the pages may differ depending on the job settings received from the printer driver (e.g. duplex vs. simplex, usage of Booklet or Stapling features, etc.). • When Image Spooling in enabled, all pages of the incoming data are converted to image data and then stored to the HDD. Once this is completed for all pages, the data is then sent to the printing engine for printing out. Note: The order in which jobs are printed out is same whether Image Spooling is enabled or disabled. Page 47 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 47 of 86

2-2

Printer

2-2-1 Overview of Printer Operations

•

The Printer function can be divided into main processes: 1) Converting the printer language data

received by the MFP/LP into image data, and 2) Printing out this image data onto the paper in

accordance with the specified job settings. The former is performed by the printer language processing

subsystem, while the latter is performed by the printing subsystem.

•

Once the data sent from the host computer is accepted, and the processing subsystem begins

processing the new print job, a print job log entry is created (temporary entry). The entry is registered

as soon as the job is completed.

2-2-2 Data Flow

Printing Unencrypted Image Data

•

As stated above, the printer language-encoded data sent from the host computer is interpreted by the

language processing subsystem, after which it is converted into image data and then stored

temporarily in the Page Memory in binary bitmap format. Once this is done, the data is compressed in

Ricoh original compression format, and stored in the HDD page by page. If the MFP/LP does not have

an HDD, the compressed data remains in the Page Memory and is treated the same as data written to

the HDD.

•

When Spooling is enabled, the incoming data is stored directly to the spooling area of the HDD.

Following this, the data is sent to the language processing subsystem, where it is interpreted and

converted to image data page by page. Before it is printed out, the spooled data can be deleted from

the “Spool Printing” list in WebImageMonitor, or “Spooling Job” list on the MFP/LP operation panel.

The data is developed page by page in the order in which it was converted (beginning from page 1),

however the actual printing order of the pages may differ depending on the job settings received from

the printer driver (e.g. duplex vs. simplex, usage of Booklet or Stapling features, etc.).

•

When Image Spooling in enabled, all pages of the incoming data are converted to image data and then

stored to the HDD. Once this is completed for all pages, the data is then sent to the printing engine for

printing out.

Note:

The order in which jobs are printed out is same whether Image Spooling is enabled or disabled.

Note:

The Document Server and all related Printer functions described below are supported by

MFP

models only.