Dell C7765DN MFP Color Laser Printer - Manual (Page 75)

Dell C7765dn Security Target
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Security Functions
Security Functional
Requirements TSF_IOW TSF_CIPHER TSF_USER_AUTH TSF_FMT TSF_CE_LIMIT TSF_F
A
U
TSF_NET_PROT TSF_F
A
X_FLOW
TSF_SELF_TEST
FMT_MSA.3
        
FMT_MTD.1
        
FMT_SMF.1
        
FMT_SMR.1
        
FPT_STM.1
        
FPT_TST.1
        
FTP_TRP.1
        
The summary of each TOE security function and the corresponding security functional requirements
are described below.
7.1.1. Hard Disk Data Overwrite (TSF_IOW)
According to Hard Disk Data Overwrite setting which is configured by a system administrator with
the system administrator mode, the used document data in the internal HDD are deleted by either one
or three pass overwrite procedure on the document data area when each job of copy, print, scan,
Network Scan, fax, Internet Fax, or Direct Fax is completed.
This is because whether to prioritize efficiency or security depends on the usage environment of the
MFD.
When efficiency is prioritized, one pass overwrite procedure is applied. When security is prioritized,
three pass overwrite procedure is applied. Three pass overwrite has lower processing speed than one
pass but can provide more solid overwrite function. Therefore, three pass is an appropriate number of
times to overwrite.
(1) FDP_RIP.1 Subset Residual Information Protection
To control the overwrite function conducted after each job, two options are available: one pass
(zero) overwrite procedure and three pass (random number / random number / zero) overwrite
procedure.
List of the used document data which are to be overwritten and deleted is on the internal HDD.
When the existence of the used document data are found in this list at the time of booting the
TOE, the overwrite function is performed.
7.1.2. Hard Disk Data Encryption (TSF_CIPHER)
According to Hard Disk Data Encryption setting which is configured by a system administrator with