permanent cite key

when exporting as bibtex file the convention for cite keys is author, year and first word in the title. Some of my cite keys are in the form of noauthor, noyear.

Currently, i am using cite keys for references but the cite key may change over time, resulting in broken references.

Is there any way to address a reference using a permanent, unique identifier? Not necessarily by using bibtex but maybe by using an already existing plugin or something i need to develop myself.
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