Re: new SSH cipher chacha20-poly1305
ChaCha20-Poly1305 is supported since WinSCP 5.8.1:
https://winscp.net/eng/docs/history?a=5.8.1
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/chacha20-poly1305.html
https://winscp.net/eng/docs/history?a=5.8.1
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/chacha20-poly1305.html