A new image based CAPTCHA based on geometric transformations. Mehrnejad, M, Ghaemi, A, Harati, A, & Toreini, E In 8th International ISC Conference on Information Security and Cryptology, FUM, Iran, 2011.
bibtex   
@inproceedings{mehrnejad_new_2011,
	title = {A new image based {CAPTCHA} based on geometric transformations},
	copyright = {All rights reserved},
	booktitle = {8th {International} {ISC} {Conference} on {Information} {Security} and {Cryptology}, {FUM}, {Iran}},
	author = {Mehrnejad, M and Ghaemi, A and Harati, A and Toreini, E},
	year = {2011},
}

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