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Update on Overleaf.

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nb72soza Bittner
2025-06-30 16:02:32 +00:00
committed by node
parent c532081e46
commit 05fe378eb5
6 changed files with 67 additions and 10 deletions
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6
Chapters/Background.tex
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@@ -73,7 +73,7 @@ A C-APDU consists of mandatory header fields and optional data and length fields
\caption{Structure of a \gls{capdu}}
\begin{tabular}{|l|l|l|}
\hline
\textbf{Field name} & \textbf{Length} & \textbf{Description} \\
\textbf{Field name} & \textbf{Length (bytes)} & \textbf{Description} \\
\hline \hline
$CLA$ & 1 & Instruction Class \\
$INS$ & 1 & Instruction Code \ie "SELECT" \\
@@ -91,7 +91,7 @@ A C-APDU consists of mandatory header fields and optional data and length fields
\caption{Structure of a \gls{rapdu}}
\begin{tabular}{|l|l|l|}
\hline
\textbf{Field name} & \textbf{Length} & \textbf{Description} \\
\textbf{Field name} & \textbf{Length (bytes)} & \textbf{Description} \\
\hline \hline
$Data$ & at most $N_e$ & Response Data \\
$SW1$ & 1 & Status Word 1 \\
@@ -112,7 +112,7 @@ 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
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_nokalva_asn1_nodate}.
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_nokalva_asn1_nodate}. Eventhough its an established encoding standard, it is still prone to be the source of bugs and security vulnerabilities.\cite{nist_nvd_2024, nist_nvd_2025, mitre_cve_2003}
\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.