Have you tried explicitly specifying your intended cipher when constructing the Net::SSH::Perl object?

my $ssh = Net::SSH::Perl->new(
    cipher => 'hmac-md5',
);

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I interpret the documentation in the way that unless instructed to, the module will not use a weak cipher.

In reply to Re: HMAC_MD5 with Net::SSH::Perl by Corion
in thread HMAC_MD5 with Net::SSH::Perl by UpTide

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