# ri > Net::SSH::Transport::HMAC::SHA2_512_Etm

## [Net::SSH::Transport::HMAC::SHA2512Etm](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ASSH%3A%3ATransport%3A%3AHMAC%3A%3ASHA2512Etm/markdown) < [Net::SSH::Transport::HMAC::Abstract](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ASSH%3A%3ATransport%3A%3AHMAC%3A%3AAbstract/markdown)

(from /home/chedong/.local/share/rdoc)
------------------------------------------------------------------------
The SHA-512 Encrypt-Then-Mac HMAC algorithm. This has a mac and key
length of 64, and uses the SHA-512 digest algorithm.
------------------------------------------------------------------------