DES and AES Decryption

Section 6: MICR Features

Data Encryption Standard (DES) and the recently approved 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 FIPS 46-3 standard. An alternative to DES called Triple DES is not supported in our Secure MICR printers.

AES is documented in a new Federal Information Processing Standard (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 forAES is Rijndael. Developed in Belgium, an English pronunciation alternative is “Rain Doll”. In addition to U.S. Government implementations, it is anticipatedAES 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 supported separately so that bothAES 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.

Decryption Commands

Decryption requires printer processing overhead. In our testing encrypted printer data steams near or below 100K bytes per page do not seem to affect printer speed in term of pages per minute or first page out timings. Some testing done with print files from 500K to 1 Meg per page showed up to a 30% degra- dation in speed. It is therefore recommended the encryption be reserved for the confidential portions of the data when large file sizes are anticipated.

Set DES Decryption Key Command&%STSETDESKEY<16 Hex Characters>$

The command requires a MICR Password Command be sent prior to the Key Command. The Key Command could itself be encrypted and then decrypted in the printer. The command requires the key data be in a double-byte hex format. The 8 byte value must be converted to the 16 byte format. The only values that can be contained in the 16 command bytes are 0 through 9, A through F. Alpha key characters can be upper or lower case. Command characters must be upper case. An example of a valid key & command - %STSETDESKEY5f00FF7E3DA938eb$ The key value remains in the printer until another key command is received. Printer power cycles and printer reset commands do not affect the key value.

The dollar sign ($) is the command terminator and is required.

Secure MICR Printer User’s Guide July 2003

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ST9335 specifications

The Source Technologies ST9335 is a cutting-edge payment and transaction terminal designed for high-security environments and robust performance. As the demand for secure payment processing continues to rise, the ST9335 stands out with its modern technology and user-friendly features that meet both merchant and consumer needs.

One of the defining characteristics of the ST9335 is its advanced encryption capabilities. Security is paramount in payment processing, and this terminal incorporates end-to-end encryption (E2EE) to protect sensitive cardholder data during transactions. This technology ensures that all payment information is securely transmitted, thereby minimizing the risk of data breaches and fraud.

In addition to its security features, the ST9335 boasts a high-resolution color touchscreen display, which enhances the user experience by providing clear visuals and easy navigation. The intuitive interface allows both merchants and customers to complete transactions quickly and efficiently. The large display also supports customizable branding and promotional content, enabling businesses to communicate directly with their customers.

The ST9335 is equipped with multiple connectivity options, including Ethernet, Wi-Fi, and 4G LTE. This versatility ensures that merchants can select the best connection method for their specific environment, whether they operate in a retail space, a restaurant, or a mobile setting. The device’s adaptability to various network configurations streamlines payment processing, reducing wait times and enhancing customer satisfaction.

Another notable feature is its compatibility with a broad range of payment methods. The ST9335 supports traditional magnetic stripe cards, EMV chip cards, and contactless payments such as NFC and mobile wallets. As consumers increasingly prefer to use contactless payments for convenience and speed, this terminal stays relevant in the evolving landscape of payment processing.

The design of the ST9335 is another highlight, with a rugged and ergonomic form factor that withstands daily wear and tear. Its durable construction, combined with an IP54 rating for splash and dust resistance, ensures longevity in various operating conditions.

Not only does the ST9335 provide robust security and ease of use, but it also supports a range of value-added services such as loyalty programs, gift card processing, and inventory management. This multifunctionality allows businesses to enhance customer engagement and streamline their operations.

In summary, the Source Technologies ST9335 is a powerful and versatile payment terminal that combines advanced security, a user-friendly interface, multiple connectivity options, and support for various payment methods. Whether in a retail shop or on the go, the ST9335 is designed to meet the evolving needs of today’s businesses and consumers, making it a reliable choice for any transaction environment.

Source Technologies ST9335 manual DES and AES Decryption

Models: ST9335