olemus
võtmeteabe krüptograafiline teisendamine ta tugevduks
jõuründevastu, eeskätt nõrga võtme/parooli puhul
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techniques used to make a key/password more secure against brute force attacks

ülevaateid
https://simplicable.com/IT/key-stretching-definition

https://en.wikipedia.org/wiki/Key_stretching

https://www.johndcook.com/blog/2019/01/25/salt-and-stretching/

https://www.scribd.com/document/49584348/Key-stretching

näiteid
https://www.professormesser.com/security-plus/sy0-501/key-stretching-algorithms/

https://www.youtube.com/watch?v=yelMxr7UErk