Please note that JavaScript and style sheet are used in this website,
Due to unadaptability of the style sheet with the browser used in your computer, pages may not look as original.
Even in such a case, however, the contents can be used safely.

  1. Home
  2. Press Releases
  3. NEC develops authenticated encryption technology for IoT sensors and devices

NEC develops authenticated encryption technology for IoT sensors and devices - Reduces computational complexity to approximately 1/2 that of conventional technologies -

*** For immediate use July 21, 2015

Tokyo, July 21, 2015 - NEC Corporation (NEC; TSE: 6701) today announced the successful development of OTR, an authenticated encryption technology that reduces computational complexity to approximately half that of existing conventional technologies.

OTR enables the use of highly-secure authenticated encryption when connecting sensors and other devices with restricted data processing via the Internet of Things (IoT).

This technology has successfully cleared the first round of selection in the Competition for Authenticated Encryption: Security, Applicability, and Robustness (CAESER), an authenticated encryption competition funded by the United States National Institute of Standards and Technology (NIST). Clearing the first round of this competition is a major step towards recommendation as a next-generation authenticated encryption technology. After further screening, finalists in the CAESER competition will be selected in 2016, concluding with a next-generation authenticated encryption technology scheduled to be decided in December 2017.

"Looking ahead, in addition to aiming for CAESER adoption as a next-generation authenticated encryption technology, NEC will continue to advance its research into these technologies as part of achieving more robust security for the company's Solutions for Society," said Motoo Nishihara, General Manager, Knowledge Discovery Research Laboratories, NEC Corporation.

Key features of this new technology are as follows:

  1. Development of authenticated encryption technology with low computational complexity
    NEC developed Offset Two-round (OTR) authenticated encryption technology that utilizes a block cipher and performs both encryption (confidentiality) and message authentication (integrity) efficiently. This is in contrast to conventional methods, where authentication requires the same computational complexity as encryption. OTR is a creative block-cipher mode of operation, combining the processing of encryption and authentication-tag generation into a joint process, thereby reducing the computational complexity by half.

    OTR also enables high-speed data processing through parallel processing. Moreover, since OTR utilizes the block cipher encryption function for the decryption of received data, it also eliminates the implementation of the block-cipher decryption function. This helps to suppress the size and scale of programs and circuitry, and increases its degree of implement-ability in miniature sized sensors and devices.

  2. AES-OTR: OTR using the block cipher Advanced Encryption Standard (AES)
    AES-OTR guarantees the security of authenticated encryption as a whole, based on the security of AES, while also enabling more efficient authenticated encryption than with conventional technologies. This is accomplished by utilizing the rich implementation assets of AES developed to date, such as circuits, special instructions of processors and software. The high-speed performance of AES-OTR has also been verified.


About NEC Corporation
NEC Corporation is a leader in the integration of IT and network technologies that benefit businesses and people around the world. By providing a combination of products and solutions that cross utilize the company's experience and global resources, NEC's advanced technologies meet the complex and ever-changing needs of its customers. NEC brings more than 100 years of expertise in technological innovation to empower people, businesses and society.  For more information, visit NEC at

Based on its Mid-term Management Plan 2015, the NEC Group globally provides "Solutions for Society" that promote the safety, security, efficiency and equality of society. Under the company's corporate message of "Orchestrating a brighter world," NEC aims to help solve a wide range of challenging issues and to create new social value for the changing world of tomorrow. For more information, please visit

Orchestrating a brighter world

NEC is a registered trademark of NEC Corporation. All Rights Reserved. Other product or service marks mentioned herein are the trademarks of their respective owners. (C)2015 NEC Corporation.