[taler-donau] branch master updated: thesis blinded signatures

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lukas-matyja pushed a commit to branch master
in repository donau.

The following commit(s) were added to refs/heads/master by this push:
     new e842ab2  thesis blinded signatures
e842ab2 is described below

commit e842ab25bdde1965d7396bc3e2c27bc351f87caa
Author: Matyja Lukas Adam <lukas.matyja@students.bfh.ch>
AuthorDate: Sun Jun 2 22:29:52 2024 +0200

    thesis blinded signatures
---
 doc/thesis/bibliography.bib                  |  26 ++++++++++++++++++++++++++
 doc/thesis/chapters/background/blindsign.tex |   7 ++++---
 doc/thesis/thesis.pdf                        | Bin 1991880 -> 1995241 bytes
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/doc/thesis/bibliography.bib b/doc/thesis/bibliography.bib
index c5715c5..52ab0bc 100644
--- a/doc/thesis/bibliography.bib
+++ b/doc/thesis/bibliography.bib
@@ -5,3 +5,29 @@
     addendum = "(accessed: 29.05.2024)",
     keywords = "qrcode,DENSOWAVE"
 }
+@misc{cryptoeprint:2019/877,
+      author = {Georg Fuchsbauer and Antoine Plouviez and Yannick Seurin},
+      title = {Blind Schnorr Signatures and Signed ElGamal Encryption in the 
Algebraic Group Model},
+      howpublished = {Cryptology ePrint Archive, Paper 2019/877},
+      year = {2019},
+      url = {https://eprint.iacr.org/2019/877}
+}
+
+@book{nigelcrypto:2016,
+language = {eng},
+publisher = {Springer},
+series = {Information security and cryptography},
+title = {Cryptography made simple},
+year = {2016},
+author = {Smart, Nigel P. and Smart, Nigel Paul},
+keywords = {Cryptography},
+}
+
+@misc{DemHeuz2022,
+      author = {Gian Demarmels, Lucien Heuzeveld},
+      title = {Adding Schnorr’s Blind Signature in Taler},
+      year = {2022},
+      addendum = {accessed: 02.06.2024},
+      url = {https://taler.net/papers/cs-thesis.pdf}
+}
+
diff --git a/doc/thesis/chapters/background/blindsign.tex 
b/doc/thesis/chapters/background/blindsign.tex
index ddb3579..9fdd122 100644
--- a/doc/thesis/chapters/background/blindsign.tex
+++ b/doc/thesis/chapters/background/blindsign.tex
@@ -1,12 +1,13 @@
 \section{Cryptography Preliminaries}
 The project is based on existing cryptography. The most important 
cryptographic elements are described in this section.
 
-\subsection{Blinded Signatures}
-This section only provides an overview of blinded signatures. Detailed 
information about blinded signature can be found at 
\url{https://taler.net/papers/cs-thesis.pdf}. Blinded signatures are the key 
elements to reach privacy for the donor (see chapter xx). With blinded 
signatures a blinded unrecognizable message was signed. Only the creator of the 
blinded message is able to unblind the signature and therefore to receive a 
valid signature for the unblinded message. The Donau uses blinded [...]
+\subsection{Blinded Signature Schemes}
+This section only provides an overview of blinded signatures. Detailed 
information about blinded signature can be found at 
\url{https://taler.net/papers/cs-thesis.pdf}. Blinded signatures are the key 
elements to reach privacy for the donor (see chapter xx). With blinded 
signatures a blinded unrecognizable message was signed. Only the creator of the 
blinded message is able to unblind the signature and therefore to receive a 
valid signature for the unblinded message. The Donau system uses  [...]
 
 \subsubsection{RSA Blind Signature Scheme}
-
+Concrete the RSA-FDH blind signatures are used. Before blinding, to eliminate 
certain attacks, a Full-Domain Hash on the message is applied. Full-Domain 
means the hash has the same size as the RSA modulus. The blind signature scheme 
is similar to the normal RSA signatur scheme. In addition to the normal scheme, 
the message is blinded with an private and random value. Practically the length 
of the modulus and therefore for the key size, signature size and the security 
level is variable. T [...]
 \subsubsection{Clause Blind Schnorr Signature Scheme}
+The Clause Schnorr Signature Scheme differs from the RSA scheme. Initially the 
blinder needs two random values from the signer party. One random value from 
the signer and two random private values are required to blind the message 
once. This process is repeated and the two blinded messages are sent to the 
signer, who randomly selects a blinded message for blinding. Two blinded 
messages are needed to prevent an certain type of attack. In comparision to the 
RSA scheme, the Clause Schnorr S [...]
 \subsubsection{EdDSA Signatures}
 
 
diff --git a/doc/thesis/thesis.pdf b/doc/thesis/thesis.pdf
index 7dcc59c..426e521 100644
Binary files a/doc/thesis/thesis.pdf and b/doc/thesis/thesis.pdf differ

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