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Docurity: A New Cryptographic Primitive for Collaborative Cloud Systems

Byeori Kim1, Minseong Choi1, Taek-Young Youn2, Jeong Hyun Yi1, Haehyun Cho1,*

1 Soongsil University, Seoul, 06978, Korea
2 Dankook University, Yongin, 16890, Korea

* Corresponding Author: Haehyun Cho. Email: email

Intelligent Automation & Soft Computing 2023, 36(3), 3725-3742.


Recently, there has been a sudden shift from using traditional office applications to the collaborative cloud-based office suite such as Microsoft Office 365. Such cloud-based systems allow users to work together on the same document stored in a cloud server at once, by which users can effectively collaborate with each other. However, there are security concerns unsolved in using cloud collaboration. One of the major concerns is the security of data stored in cloud servers, which comes from the fact that data that multiple users are working together cannot be stored in encrypted form because of the dynamic characteristic of cloud collaboration. In this paper, we propose a novel mode of operation, DL-ECB, for AES by which we can modify, insert, and delete the ciphertext based on changes in plaintext. Therefore, we can use encrypted data in collaborative cloud-based platforms. To demonstrate that the DL-ECB mode can preserve the confidentiality, integrity, and auditability of data used in collaborative cloud systems from adversaries, we implement and evaluate the prototype of the DL-ECB mode.


Cite This Article

B. Kim, M. Choi, T. Youn, J. H. Yi and H. Cho, "Docurity: a new cryptographic primitive for collaborative cloud systems," Intelligent Automation & Soft Computing, vol. 36, no.3, pp. 3725–3742, 2023.

cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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