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FABEO: Fast Attribute-Based Encryption with Optimal Security
Attribute-based encryption (ABE) enables fine-grained access control on encrypted data and has a large number of practical …
Doreen Riepel, Hoeteck Wee
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Group Action Key Encapsulation and Non-Interactive Key Exchange in the QROM
In the context of quantum-resistant cryptography, cryptographic group actions offer an abstraction of isogeny-based cryptography in …
Julien Duman, Dominik Hartmann, Eike Kiltz, Sabrina Kunzweiler, Jonas Lehmann, Doreen Riepel
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Strongly Anonymous Ratcheted Key Exchange
Anonymity is an (abstract) security goal that is especially important to threatened user groups. Therefore, widely deployed …
Benjamin Dowling, Eduard Hauck, Doreen Riepel, Paul Rösler
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Password-Authenticated Key Exchange from Group Actions
We present two provably secure password-authenticated key exchange (PAKE) protocols based on a commutative group action. To date the …
Michel Abdalla, Thorsten Eisenhofer, Eike Kiltz, Sabrina Kunzweiler, Doreen Riepel
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Authenticated Key Exchange and Signatures with Tight Security in the Standard Model
We construct the first authenticated key exchange protocols that achieve tight security in the standard model. Previous works either …
Shuai Han, Tibor Jager, Eike Kiltz, Shengli Liu, Jiaxin Pan, Doreen Riepel, Sven Schäge
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Analysing the HPKE Standard
The Hybrid Public Key Encryption (HPKE) scheme is an emerging standard currently under consideration by the Crypto Forum Research Group …
Joël Alwen, Bruno Blanchet, Eduard Hauck, Eike Kiltz, Benjamin Lipp, Doreen Riepel
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Tightly-Secure Authenticated Key Exchange, Revisited
We introduce new tightly-secure authenticated key exchange (AKE) protocols that are extremely efficient, yet have only a constant …
Tibor Jager, Eike Kiltz, Doreen Riepel, Sven Schäge
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