Paper 2018/1202

AuthCropper: Authenticated Image Cropper for Privacy Preserving Surveillance Systems

Jihye Kim, Jiwon Lee, Hankyung Ko, Donghwan Oh, Semin Han, Kwonho Jeong, and Hyunok Oh


As surveillance systems are popular, the privacy of the recorded video becomes more important. On the other hand, the authenticity of video images should be guaranteed when used as evidence in court. It is challenging to satisfy both (personal) privacy and authenticity of a video simultaneously, since the privacy requires modifications (e.g., partial deletions) of an original video image while the authenticity does not allow any modifications of the original image. This paper proposes a novel method to convert an encryption scheme to support partial decryption with a constant number of keys and construct a privacy-aware authentication scheme by combining with a signature scheme. The security of our proposed scheme is implied by the security of the underlying encryption and signature schemes. Experimental results show that the proposed scheme can handle the UHD video stream with more than 17 fps on a real embedded system, which validates the practicality of the proposed scheme.

Available format(s)
Cryptographic protocols
Publication info
Preprint. MINOR revision.
PrivacyAuthenticationForward-secure signatureVideo
Contact author(s)
easyone518 @ gmail com
2018-12-18: received
Short URL
Creative Commons Attribution


      author = {Jihye Kim and Jiwon Lee and Hankyung Ko and Donghwan Oh and Semin Han and Kwonho Jeong and Hyunok Oh},
      title = {AuthCropper: Authenticated Image Cropper for Privacy Preserving Surveillance Systems},
      howpublished = {Cryptology ePrint Archive, Paper 2018/1202},
      year = {2018},
      note = {\url{}},
      url = {}
Note: In order to protect the privacy of readers, does not use cookies or embedded third party content.