olemus
(1) ühesuunaline ja kollisioonivaba räsifunktsioon
CNSSI 4009-2015:
a hash algorithm with the property that it is computationally infeasible 1) to find a message that corresponds to a given message digest, or 2) to find two different messages that produce the same message digest
https://people.eecs.berkeley.edu/~jfc/cs174/lecs/lec22/lec22.pdf
https://www.irjmets.com/uploadedfiles/paper//issue_12_december_2023/47726/final/fin_irjmets1703603936.pdf
https://thesai.org/Downloads/Volume9No8/Paper_13-Comparison_of_Hash_Function_Algorithms.pdf

(2) = SHA