Would it be AES-256 with XTS, similar to VeraCrypt?
Hi,
cryptsetup luksDump /dev/path/to/encrypted-volume
Should show that information… (replace /path/to… with your device)
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I believe this is the relevant documentation. AFAIK default values are used.
https://wiki.archlinux.org/title/Dm-crypt/Device_encryption#Encryption_options_with_dm-crypt