Man pages matching name crypt::cipher::safer_sk64 in section 3pm:

Crypt::Cipher::SAFER_SK64.3pm.en	debian 10 / libcryptx-perl
Crypt::Cipher::SAFER_SK64.3pm.en	debian 11 / libcryptx-perl
Crypt::Cipher::SAFER_SK64.3pm.en	debian 12 / libcryptx-perl