diff --git a/Chapters/Background.tex b/Chapters/Background.tex index cba918a..01150ed 100644 --- a/Chapters/Background.tex +++ b/Chapters/Background.tex @@ -110,8 +110,6 @@ The status word (SW) in an \gls{rapdu} signifies whether a command was successfu % - it uses a TLV for the encoding of all its information -> tag indicates what kind of data follows, then length to tell the parser how much that to read for this tag, and then the actual data (provide example for BER-TLV ASN1 encoding of some short RSP message) % - the GSMA provides ASN.1 definitions for all of its standardized functions -\paragraph{Data Encoding} - When interacting with a \gls{uicc}, either to request or to store data, the command payload is typically structured using \gls{asn1} encoded in the \gls{ber}-\gls{tlv} format. \gls{asn1} is a formal language used to define data structures in a way that is independent of machine-specific encoding. It is a mature and widely adopted technology, particularly within the field of telecommunications, and is standardized by the ITU-T~\cite{oss-asn1}. \gls{asn1} supports a variety of encoding rules. One of the most commonly used in the context of smart cards and mobile communications is the \gls{ber}. In \gls{ber}, all data is encoded as a sequence of \gls{tlv} elements. The \emph{Tag} identifies the type of data, the \emph{Length} specifies the number of bytes used for the value, and the \emph{Value} contains the actual data payload. @@ -205,6 +203,12 @@ Together, these components establish the trust and management architecture neces \section{eSIM on SIM} +% - most popular option of integrating esims is directly soldering them onto the cricuit board of a smartphone +% - since the soldered esim is near identical to the SIMs normally distributed as physical SIMs -> esims can also be distributed as physical esims +% - Come in formfactors 2FF, 3FF, and 4FF to the best of our knowledge +% - most of the esims on sims we could find are manufactured by kigen, estcompeace, Giesecke+Devrient +% - latter one produces the esim chips for apple + \section{Remote SIM Provisioning} \paragraph{Local Profile Assistant}