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. 2019 Mar 24;21(3):319. doi: 10.3390/e21030319

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Decrypted images of Lena, Cameraman, Barbara, Mandril and Bw with security keys $g_{1}$ and $g_{2}$ . The first and the second row is with $g_{1}$ and $g_{2}$ , respectively.