The part of speech which is secure, as used in this excerpt is:
Adjective
What are parts of speech?
The trojan Horse is a common allusion utilized as a kind of spy to get into a thing which is secure by disguising as something which is not harmful or threatening based on the Battle of Troy.
With that description above, some virus software's operate in that same way above they disguise themselves and enter into a secure system and proceed to destroy it from the inside.
Thus, we conclude that;
The part of speech which is secure, as used in this excerpt is: Adjective
The word which "secure" is describing is: Software
The thing which "secure" means, as used in this excerpt is: Safe from attack
Read more about parts of speech at; https://brainly.com/question/12405676