Ricoh Aficio MP C4000 Features Guide

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Hard Drive (HDD) Encryption
This function can encrypt the system’s hard drive to protect against data theft. Even if the hard drive
stolen, data will not be disclosed. The encryption methodology used is Advanced Encryption Standard
(AES) to 256 bits.
Document Protection
Finally, once a document has arrived at the output device for printing or storage, there needs to be
sufficient protection in place to guard against unintentional access, reprinting, distribution, or
modification for as long as the file resides in memory. Ricoh devices offer a number of features that
safeguard information until the owner decides to retrieve or delete it.
DataOverwriteSecurity System (DOSS)
Ricoh devices with hard disk drives installed, sometimes referred to as the Document Server, temporarily
store every document processed by Ricoh printers and MFPs whether copied, printed, faxed, or scanned.
While there are considerable benefits related to sharing stored documents among authorized users,
there is also the potential for unauthorized access,
theft, or falsification. The DataOverwriteSecurity
System (DOSS) eliminates these threats by overwriting
the hard disk after each job so that files cannot be
retrieved or recovered. Initially designed to meet gov-
ernment, military, and major account requirements for
document security, you can use DOSS to add value to
customers with all types of mission-critical documents
that require protection from leaks and unauthorized
distribution.
DOSS destroys temporary data (not documents stored to the Document Server or data saved in Address
Books) stored on device hard drives using one of three overwrite methods. Overwriting not only applies
to all copy and print jobs, but scanned files, Sample Print/Locked Print, and File Format Conversions as
soon as the job is completed:
■ NSA (National Security Agency) Standard: Overwrites the data three times: twice with random
numbers and once with zeros.
■ DoD (Department of Defense) Standard: Overwrites the temporary data with a fixed value, the fixed
value’s complement, and then with random numbers. It then verifies the result.
■ Random Data Overwrite Standard: Allows users to overwrite temporary files with random numbers.
Users select how many times the files will be overwritten, up to a maximum of nine times. The default
is three times.

Ricoh Aficio MP C4000 Specifications