# Formatting of the BibLaTeX citation key

I've got a BibLaTeX database which is set up to be printed with alphabetic style. That results in the wanted characters, but not in the wanted formatting. I would like to have those keys (shown as enumeration items in the bibliography and in every citation) typeset as \scshape. How can I achieve that?

\documentclass{scrartcl}

\usepackage[backend=biber,style=alphabetic,maxbibnames=1,maxcitenames=1,defernumbers,%
doi=false,isbn=false,clearlang=false,backref=false]{biblatex}

\begin{filecontents}{bib.bib}
@ONLINE{text:source,
author={B. Obby},
title={Sources today},
url={http://www.example.com},
urldate={2017-02-20},}
\end{filecontents}

\bibliography{bib}
\nocite{*}

\begin{document}

Text with citation: \autocite{text:source}

\printbibliography

\end{document}


Change the field format.

\documentclass{scrartcl}

\usepackage[backend=biber,style=alphabetic,maxbibnames=1,maxcitenames=1,defernumbers,%
doi=false,isbn=false,clearlang=false,backref=false]{biblatex}