Abstract
In recent years, there has been a rising interest in authenticated encryption with associated data (AEAD) which combines encryption and authentication into a unified scheme. AEAD schemes provide authentication for a message that is divided into two parts: associated data which is not encrypted and the plaintext which is encrypted. However, there is a lack of chaos-based AEAD schemes in recent literature. This paper introduces a new 128-bit chaos-based AEAD scheme based on the single-key Even-Mansour and Type-II generalized Feistel structure. The proposed scheme provides both privacy and authentication in a single-pass using only one 128-bit secret key. The chaotic tent map is used to generate whitening keys for the Even-Mansour construction, round keys, and random s-boxes for the Feistel round function. In addition, the proposed AEAD scheme can be implemented with true random number generators to map a message to multiple possible ciphertexts in a nondeterministic manner. Security and statistical evaluation indicate that the proposed scheme is highly secure for both the ciphertext and the authentication tag. Furthermore, it has multiple advantages over AES-GCM which is the current standard for authenticated encryption.
Highlights
Encryption and authentication of data are traditionally performed by two separate algorithms under the influence of different secret keys
authenticated encryption with associated data (AEAD) schemes are more efficient and less prone to implementation errors, unlike generic composition [3]. This is because an AEAD scheme can be implemented without extensive cryptographic knowledge and is easy for interoperability [4]
This paper introduced a new chaos-based authenticated encryption with associated data (AEAD) scheme
Summary
Encryption and authentication of data are traditionally performed by two separate algorithms under the influence of different secret keys. This is known as generic composition which has three variations: Encrypt-and-MAC, MAC-thenEncrypt, and Encrypt--MAC [1]. AEAD schemes are more efficient and less prone to implementation errors, unlike generic composition [3]. This is because an AEAD scheme can be implemented without extensive cryptographic knowledge and is easy for interoperability [4]. As it only requires one key for both privacy and integrity, it saves on key bits and key setup time and reduces the risk of users selecting insecure parameters
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