Hi Pierre, On 17.07.19 13:13, Pierre Frenkiel wrote: > thanks, but I've still 2 questions: > > 1/ why something which worked yesterday doesn't work today? You'll note this often happens in IT due to the sheer number of moving parts (updates, changes of infrastructure, ...) > 2/ what would be the recommended key in this long list? Cryptographic advice is a matter of a) research and b) trust. Some hopefully knowledgeable people wrote a blog entry with recommendations: https://paragonie.com/blog/2019/03/definitive-2019-guide-cryptographic-key-sizes-and-algorithm-recommendations There exists also this site that lists different recognized recommendations: https://www.keylength.com Best wishes Michael
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