Source Technologies, LLC ST9620 Secure MICR Printer User’s Guide
36
&%STTU# Unlocks tray
# The tray to be unlocked (choose from 1, 2 or 3 only)
$ Command terminator
Tray Swapping Commands &%STTSON$ / &%STTSOFF$
&%STTSON Turns tray swapping on
&%STTSOFF Turns tray swapping off
$ Command terminator
This command allows you to redefine the PCL values for Trays 2 and 3 to allow software
and operational consistency with older printers in the system. Swapping ON causes any
<esc>&l4H to be replaced with 5H and vice-versa.
DES and AES Decryption
Data Encryption Standard (DES) and the Advanced Encryption Standard (AES) are both
supported in the Source Technologies secure MICR printers. The minimum Code Level
support for AES is 8.5j. Levels 8.5i. and lower only support DES.
DES originated at IBM in 1977 and was adopted by the U.S. Department of Defense.
The controlling standards for DES are ANSI X3.92 and X3.106 and in the Federal
Information Processing Standard (FIPS) 46-3 standard. An alternative to DES, called
Triple DES, is not supported in our Secure MICR printers.
AES is documented in a FIPS standard, FIPS 197, dated 11/26/2001. Three key sizes
are documented in the standard, 128-bit, 192-bit, & 256-bit. We currently only support
the most commonly used 128-bit key size.
The algorithm selected for AES is Rijndael. Developed in Belgium, an English
pronunciation alternative is “Rain Doll”. In addition to U.S. Government implementations,
it is anticipated that AES will be adopted by businesses, organizations, institutions, and
individuals outside of government, and outside of the United States as was the case for
DES.
We only support decryption for DES and AES. Encrypted printer data streams can be
decrypted using the key stored some time prior to the message. Keys for both DES and
AES are stored separately so that both AES and DES are supported simultaneously.
The keys messages themselves can be encrypted with either DES or AES for either
DES or AES. Only one DES and one AES key exists at any one point in time. Old keys
are not saved. To change either a DES or an AES key requires the MICR Password
Command.
The Secure MICR printer does not have any capability to encrypt a return or Bi-
directional message.
MICR Features | 6