Hybrid QKD and post-quantum cryptography in secure key exchange

The advent of quantum computing poses a significant threat to classical cryptographic systems, necessitating the development of quantum-resistant alternatives. This thesis explores a hybrid key exchange framework combining Quantum Key Distribution (QKD) with Post-Quantum Cryptography (PQC) to secure...

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Detalles Bibliográficos
Autor: Smilenov, Ivan Yavorov
Tipo de recurso: tesis de maestría
Fecha de publicación:2025
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/450784
Acceso en línea:https://hdl.handle.net/2117/450784
Access Level:acceso abierto
Palabra clave:Cryptography
Hybrid systems
QKD
PQC
Quantum
Key distribution
Key exchange
Authentication
Hybrid
Encryption
Criptografia
Sistemes híbrids
Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia
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spelling Hybrid QKD and post-quantum cryptography in secure key exchangeSmilenov, Ivan YavorovCryptographyHybrid systemsQKDPQCQuantumKey distributionKey exchangeAuthenticationHybridEncryptionCriptografiaSistemes híbridsÀrees temàtiques de la UPC::Informàtica::Seguretat informàtica::CriptografiaThe advent of quantum computing poses a significant threat to classical cryptographic systems, necessitating the development of quantum-resistant alternatives. This thesis explores a hybrid key exchange framework combining Quantum Key Distribution (QKD) with Post-Quantum Cryptography (PQC) to secure classical post-processing steps such as information reconciliation and privacy amplification. Specifically, CRYSTALS-Kyber is used for key encapsulation, while CRYSTALS-Dilithium and SPHINCS+ provide digital signatures for authentication. While the mathematical security foundations of these algorithms are assumed, their integration is evaluated through performance benchmarking and system-level analysis. The results show that incorporating PQC-based authentication into QKD post-processing significantly improves resilience against quantum adversaries, while introducing only a reasonable computational and bandwidth overhead. This work contributes to the development of robust hybrid cryptographic systems capable of with standing both classical and quantum-era threats.Universitat Politècnica de CatalunyaRodríguez Fonollosa, Javier20252025-06-1720262026-01-19master thesishttp://purl.org/coar/resource_type/c_bdccNAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/masterThesisapplication/pdfhttps://hdl.handle.net/2117/450784reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4507842026-05-27T15:37:01Z
dc.title.none.fl_str_mv Hybrid QKD and post-quantum cryptography in secure key exchange
title Hybrid QKD and post-quantum cryptography in secure key exchange
spellingShingle Hybrid QKD and post-quantum cryptography in secure key exchange
Smilenov, Ivan Yavorov
Cryptography
Hybrid systems
QKD
PQC
Quantum
Key distribution
Key exchange
Authentication
Hybrid
Encryption
Criptografia
Sistemes híbrids
Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia
title_short Hybrid QKD and post-quantum cryptography in secure key exchange
title_full Hybrid QKD and post-quantum cryptography in secure key exchange
title_fullStr Hybrid QKD and post-quantum cryptography in secure key exchange
title_full_unstemmed Hybrid QKD and post-quantum cryptography in secure key exchange
title_sort Hybrid QKD and post-quantum cryptography in secure key exchange
dc.creator.none.fl_str_mv Smilenov, Ivan Yavorov
author Smilenov, Ivan Yavorov
author_facet Smilenov, Ivan Yavorov
author_role author
dc.contributor.none.fl_str_mv Rodríguez Fonollosa, Javier
dc.subject.none.fl_str_mv Cryptography
Hybrid systems
QKD
PQC
Quantum
Key distribution
Key exchange
Authentication
Hybrid
Encryption
Criptografia
Sistemes híbrids
Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia
topic Cryptography
Hybrid systems
QKD
PQC
Quantum
Key distribution
Key exchange
Authentication
Hybrid
Encryption
Criptografia
Sistemes híbrids
Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia
description The advent of quantum computing poses a significant threat to classical cryptographic systems, necessitating the development of quantum-resistant alternatives. This thesis explores a hybrid key exchange framework combining Quantum Key Distribution (QKD) with Post-Quantum Cryptography (PQC) to secure classical post-processing steps such as information reconciliation and privacy amplification. Specifically, CRYSTALS-Kyber is used for key encapsulation, while CRYSTALS-Dilithium and SPHINCS+ provide digital signatures for authentication. While the mathematical security foundations of these algorithms are assumed, their integration is evaluated through performance benchmarking and system-level analysis. The results show that incorporating PQC-based authentication into QKD post-processing significantly improves resilience against quantum adversaries, while introducing only a reasonable computational and bandwidth overhead. This work contributes to the development of robust hybrid cryptographic systems capable of with standing both classical and quantum-era threats.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-06-17
2026
2026-01-19
dc.type.none.fl_str_mv master thesis
http://purl.org/coar/resource_type/c_bdcc
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/450784
url https://hdl.handle.net/2117/450784
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de Catalunya
publisher.none.fl_str_mv Universitat Politècnica de Catalunya
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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