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Anamorphic Cryptography using Baby-Step Giant-Step Recovery

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Author :  William J. Buchanan, and Jamie Gilchrist

Affiliation :  Edinburgh Napier University

Country :  United Kingdom

Category :  Networks & Communications

Volume, Issue, Month, Year :  15, 17, September, 2025

Abstract :


In 2022, Persianom, Phan and Yung outlined the creation of Anamorphic Cryptography. With this, we can create a public key to encrypt data, and then have two secret keys. These secret keys are used to decrypt the cipher into different messages. So, one secret key is given to the Dictator (who must be able to decrypt all the messages), and the other is given to Alice. Alice can then decrypt the ciphertext to a secret message that the Dictator cannot see. This paper outlines the implementation of Anamorphic Cryptography using ECC (Elliptic Curve Cryptography), such as with the secp256k1 curve. This gives considerable performance improvements over discrete logarithm-based methods with regard to security for a particular bit length. Overall, it outlines how the secret message sent to Alice is hidden within the random nonce value, which is used within the encryption process, and which is cancelled out when the Dictator decrypts the ciphertext. It also shows that the BSGS (Baby-step Giant-step) variant significantly outperforms unoptimised elliptic curve methods.

Keyword :  Partially Homomorphic Encryption, Fully Homomorphic Encryption, IP subnetting, BFV

Journal/ Proceedings Name :  CS&IT

URL :  https://aircconline.com/csit/abstract/v15n17/csit151704.html

User Name : alex
Posted 12-08-2026 on 00:19:24 AEDT



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