Security of feature extraction in image hashing

TitleSecurity of feature extraction in image hashing
Publication TypeConference Papers
Year of Publication2005
AuthorsSwaminathan A, Mao Y, M. Wu
Conference NameAcoustics, Speech, and Signal Processing, 2005. Proceedings. (ICASSP '05). IEEE International Conference on
Date Published2005/03//
Keywordscryptography;, differential, digital, entropy;, extraction;, feature, functions;, hash, hashing;, image, metric;, processing;, randomness;, robustness;, Security, signature;, signatures;

Security and robustness are two important requirements for image hash functions. We introduce "differential entropy" as a metric to quantify the amount of randomness in image hash functions and to study their security. We present a mathematical framework and derive expressions for the proposed security metric for various common image hashing schemes. Using the proposed security metric, we discuss the trade-offs between security and robustness in image hashing.