@conference {18280,
	title = {Security of feature extraction in image hashing},
	booktitle = {Acoustics, Speech, and Signal Processing, 2005. Proceedings. (ICASSP {\textquoteright}05). IEEE International Conference on},
	volume = {2},
	year = {2005},
	month = {2005/03//},
	pages = {ii/1041 - ii/1044 Vol. 2 - ii/1041 - ii/1044 Vol. 2},
	abstract = {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.},
	keywords = {cryptography;, differential, digital, entropy;, extraction;, feature, functions;, hash, hashing;, image, metric;, processing;, randomness;, robustness;, Security, signature;, signatures;},
	doi = {10.1109/ICASSP.2005.1415586},
	author = {Swaminathan,A. and Mao,Yinian and M. Wu}
}
