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The Caesar cipher is one of the simplest and oldest encryption techniques. It’s a type of substitution cipher, where each letter in the plaintext is shifted by a fixed number of positions in the ...

Abstract: This paper presents an all-optical encryption-decryption circuit at a bit rate of 250 Gbps. The input signal is ciphered at the encryption side by utilizing an orthogonally polarized secure ...

Abstract: The importance of data security in ensuring user privacy is growing even more. To attain strong security levels, it is essential to choose proper encryption techniques. In this work, we ...

Quantum computing promises transformative advancements, yet it also poses a very real risk to today’s cryptographic security. In the future scalable quantum computing could break public-key ...