Project Areas

P – Primitives

P2 – Sanitizable Cryptography

The project considers sanitization of authenticated encryptions. Such encryptions occur in secure channel protocols where the sender securely transmits data to a receiver via a service provider. The overall goal is to incorporate the possibility that a service provider can, if the sender or receiver supports this, modify the encrypted transmission in a controlled way, e.g., truncate the communication data at designated places if the receiver has a low bandwidth. The solutions will be smoothly integrable with the common channel protocols.

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Principal Investigators

  Name Working area(s) Contact
Prof. Sebastian Faust
Applied Cryptography
S7, P2
+49 6151 16-25710
S2|20 308
Prof. Marc Fischlin
Cryptography & Complexity Theory
P2, S4, E3
+49 6151 16-25730
S2|20 105

Researchers

  Name Contact
Patrick Harasser
Cryptography & Complexity Theory
+49 6151 16-25735
S2|20 103
Dr. Sogol Mazaheri
Cryptography & Complexity Theory
+49 6151 16-25736
S2|20 101

Publications

Cremers, Cas and Düzlü, Samed and Fiedler, Rune and Fischlin, Marc and Janson, Christian (2021):
BUFFing signature schemes beyond unforgeability and the case of post-quantum signature.
42nd IEEE Symposium on Security and Privacy, virtual Conference, 23.-27.05.2021, [Conference or Workshop Item]

Bock, Estuardo Alpirez and Brzuska, Chris and Fischlin, Marc and Janson, Christian and Michiels, Wil (2020):
Security Reductions for White-Box Key-Storage in Mobile Payments.
Asiacrypt 2020 - 26th Annual International Conference on the Theory and Application of Cryptology and Information Security, Daejeon, Korea, 06.-10.12., [Conference or Workshop Item]

Brendel, Jacqueline and Fischlin, Marc and Günther, Felix and Janson, Christian and Stebila, Douglas (2020):
Towards Post-Quantum Security for Signal's X3DH Handshake.
27th Selected Areas in Cryptography (SAC 2020), virtual Conference, 19.-23.10., [Conference or Workshop Item]

Davies, Gareth T. and Janson, Christian and Martin, Daniel P. (2020):
Client-oblivious OPRAM.
The 22nd International Conference on Information and Communications Security (ICICS 2020), virtual Conference, 24.-27.08., [Conference or Workshop Item]

Fischlin, Marc and Harasser, Patrick and Janson, Christian (2020):
Signatures from Sequential-OR Proofs.
EUROCRYPT 2020: 39th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Zagreb, Croatia, 10.-14. May 2020, [Conference or Workshop Item]

Degabriele, Jean Paul and Janson, Christian and Struck, Patrick (2019):
Sponges Resist Leakage: The Case of Authenticated Encryption.
ASIACRYPT 2019 - 25th Annual International Conference on the Theory and Application of Cryptology and Information Security, Kobe, Japan, 08.-12.12., [Conference or Workshop Item]

Fischlin, Marc and Haagh, Helene (2019):
How to Sign with White-Boxed AES.
Santiago de Chile, Springer, Latincrypt 2019, Oct. 2–4, 2019, [Conference or Workshop Item]

Bock, Estuardo Alpirez and Brzuska, Chris and Fischlin, Marc and Janson, Christian and Michiels, Wil (2019):
Security Reductions for White-Box Key-Storage in Mobile Payments.
In: ePrint, [Article]

Fischlin, Marc and Günther, Felix (2019):
Modeling Memory Faults in Signature and Encryption Schemes.
In: eprint, eprint.iacr.org, [Article]

Ece, Olcay (2018):
Security of E-Mail-Encryption.
TU Darmstadt, [Bachelor Thesis]

Fischlin, Marc and Harasser, Patrick (2018):
Invisible Sanitizable Signatures and Public-Key Encryption are Equivalent.
In: Springer International Publishing, LNCS 10892, In: Applied Cryptography and Network Security - ACNS 2018, pp. 202-220,
16th International Conference, ACNS 2018, Leuven, Belgium, 2.7.-4.7. 2018, [Conference or Workshop Item]

Kiel, Robert (2018):
Zero-Knowledge Contingent Payments.
TU Darmstadt, [Master Thesis]

Günther, Felix and Mazaheri, Sogol (2017):
A Formal Treatment of Multi-key Channels.
In: CRYPTO 2017 - 37th International Cryptology Conference,
Springer, Santa Barbara, CA, USA, [Conference or Workshop Item]

Erwig, Andreas and Fischlin, Marc and Hald, Martin and Helm, Dominik and Kiel, Robert and Kübler, Florian and Kümmerlin, Michael and Laenge, Jakob and Rohrbach, Felix (2017):
Redactable Graph Hashing, Revisited.
In: ACISP 2017,
[Conference or Workshop Item]

Marson, Giorgia Azzurra and Poettering, Bertram (2017):
Security Notions for Bidirectional Channels.
In: IACR Transactions on Symmetric Cryptology, 2017 (1), pp. 405-426. DOI: 10.13154/tosc.v2017.i1.405-426,
[Article]

Fischlin, Marc and Herzberg, Amir and Noon, Hon Bin and Shulman, Haya (2016):
Obfuscation Combiners.
In: International Cryptology Conference (CRYPTO),
Santa Barbara, CA, USA, [Conference or Workshop Item]

Akleylek, Sedat and Bindel, Nina and Buchmann, Johannes and Krämer, Juliane and Marson, Giorgia Azzurra (2016):
An Efficient Lattice-Based Signature Scheme with Provably Secure Instantiation.
In: International Conference on Cryptology AFRICACRYPT 2016, p. 10,
Springer, Fes, Morocco, [Conference or Workshop Item]

Bernhard, David and Fischlin, Marc and Warinschi, Bogdan (2016):
On the Hardness of Proving CCA-Security of Signed ElGamal.
In: LNCS, In: Public-Key Cryptography - PKC 2016, p. 24,
Springer, Taipei, Taiwan, ISBN 978-3-662-49384-7,
DOI: 10.1007/978-3-662-49384-7_3,
[Conference or Workshop Item]

Fischlin, Marc and Günther, Felix and Marson, Giorgia Azzurra and Paterson, Kenneth G. (2015):
Data Is a Stream: Security of Stream-Based Channels.
In: Advances in Cryptology - CRYPTO 2015, pp. 545-564,
Springer, Santa Barbara, CA, USA, [Conference or Workshop Item]

Fehr, Victoria and Fischlin, Marc (2015):
Sanitizable Signcryption: Sanitization over Encrypted Data (Full Version).
In: IACR Cryptology ePrint Archive, 2015, p. 765. [Article]