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Questions tagged [symmetric]

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Symmetric cryptosystems assume two communicating entities share a pre-established secret key.

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I have developed a program that ciphers data. Target audiences are groups of non-tech savvy activists, not able or not willing to use programs such as Kleopatra or Veracrypt, that need to protect ...
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In a system where 2 sides have exchanged each others' public keys (in encrypted form by using a very short-lived ephemeral private/public key pair generated just for that purpose) and computed a ...
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Using the AES algorithm in CBC mode, my goal is to transfer some encrypted JSON data with known keys (that means that roughly 40% to 60% of the plaintext data might be known by the attacker including ...
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I am investigating the security implications when an attacker has simultaneous access to both encryption and decryption oracles for a symmetric encryption algorithm. Specifically, by "...
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Intuitively, IND-CPA security should imply key recovery security (KR-CPA) for a symmetric encryption scheme $\Sigma$. Indeed, showing this is often given as a homework in various textbooks, such as ...
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Using a sealed_box type construct (eg. tool like age[1]) with non-hybrid ECC. Payload is encrypted to some recipient ECC public key. In this scenario, the recipient public key remains secret. Having ...
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I maintain messaging system which uses mysql RDBMS and have table with messages: ...
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NIST SP 800-232 standardizes the AEAD scheme Ascon-AEAD128, whose primary target is to provide efficient cryptographic solutions for resource-constrained devices. However, in some high-performance ...
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My understanding is that we can formally prove that PRGs can generate a polynomial length pseudorandom expansion of the seed. But don't the FSRs with non linear feedback like Trivium claim to generate ...
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What is the exact application or True Randomness in Cryptography, either symmetric or public key? It is well known that the symmetric keys of encryption algorithms are supposed to be chosen randomly ...
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For RLWE-based FHE scheme, we always use asymmetric encryption. Why are symmetric variants predominantly not employed in RLWE-based homomorphic encryption schemes?
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Is a constructed language that has its own unique grammar (not merely copycatting English or Spanish or what have you) and its own unique vocabulary (not merely borrowing from one or several existing ...
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SM4 is an unbalanced Feistel structure that takes a 128-bit plaintext and a 128-bit key as input and produces a 128-bit ciphertext as output. It consists of 32 rounds. In each round, only 32 bits are ...
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this is my first question on the Cryptography Stack Exchange. I’ve been developing a custom keystream generator and stream cipher inspired by ChaCha20 and Salsa20. As part of the evaluation process, I’...
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I have been trying to find a more modern solution for my encrypted files on cold storage. I have been using Gnupg for symmetric encryption but, as parallel computing with GPUs become ubiquitous, its ...
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