olemus
optilise kiirguse parameetritel põhinev krüptograafia

ülevaateid ja näiteid
http://spie.org/Publications/Book/2523506

https://pdfs.semanticscholar.org/c7ca/544cede67cf594acd346f63ab4b5bdd08a86.pdf

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742013000200011

https://www.researchgate.net/publication/256979788_A_review_of_optical_image_encryption_techniques

https://aip.scitation.org/doi/10.1063/1.5092216

http://ijarcsse.com/Before_August_2017/docs/papers/Volume_6/7_July2016/V6I7-0199.pdf

https://cyberleninka.org/article/n/926403.pdf

vt ka
- kvantkrüptograafia
- visuaalkrüptograafia