/usr/lib/ruby/vendor_ruby/net/ssh/transport/ is in ruby-net-ssh 1:2.2.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/net/ssh/transport/algorithms.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/cipher_factory.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/constants.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/abstract.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/md5.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/md5_96.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/none.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/sha1.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/sha1_96.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/identity_cipher.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/diffie_hellman_group1_sha1.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/diffie_hellman_group_exchange_sha1.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/openssl.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/packet_stream.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/server_version.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/session.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/state.rb