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Bidirectional Proxy Re-encryption Based on Isogenies
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DOI：10.1007/978-981-95-0172-4_9.png)
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Abstract
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Proxy re-encryption (PRE) enables a semi-trusted entity, known as a proxy, to convert a ciphertext under one public key into a ciphertext under another public key without learning the underlying plaintext. This functionality has numerous applications, including e-mail forwarding and encrypted file systems. Most existing post-quantum PRE schemes are based on lattice assumptions. In this paper, we propose a novel post-quantum PRE scheme based on isogenies. Our scheme is multi-hop bidirectional PRE and provides security against chosen plaintext attacks. We construct the PRE using a natural public key encryption (PKE) derived from CSIDH group actions.
Keywords:
Proxy re-encryption
Isogeny-based cryptography
Post-quantum cryptography
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