As adjectives the difference between untrusted and unsecured
is that untrusted is not trusted while unsecured is not secured; not fastened; not attached.
untrusted
English
Usage notes
* Used especially in computer science, cryptography, etc. to refer to a party or system that may be malicious or unsafe.
unsecured
English
Adjective
(-)
Not secured; not fastened; not attached.
Of a loan or guarantee, without collateral.