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https://crypto.stackexchange.com/questions/60136/can-non-repudiation-be-ensured-without-public-key-cryptography
With a symmetric MAC (from a construction like HMAC), anyone who has the ability to verify a MAC also has the ability to construct one, so such constructions cannot be used to provide non-repudiation. So in that sense yes, it is a limitation of symmetric-key cryptography.
https://crypto.stackexchange.com/questions/34468/non-repudiation-in-classical-cryptosystem
I want to ensure non-repudiation in symmetric key cryptography so that we can find out who is sender of a particular message.As sender and receiver share the same key, we can't find out who the sender was. symmetric non-repudiation.
https://www.coursehero.com/file/p7eer0re/Which-of-the-following-can-be-used-to-achieve-non-repudiation-a-Digital/
They are as follows: o Symmetric key cryptosystem: It uses the shared key that is available to all the users of the cryptosystem. o Public key cryptosystem: It makes use of a combination of public and private keys for each user of the cryptosystem.
https://www.trimkadriu.com/blog/public-key-cryptography-features/
Aug 27, 2017 · Non-Repudiation; Digital Signatures; Digital Certificates; So lets jump straight to it 🙂 Confidentiality. Basically, in a public key cryptography scheme, all entities will posses a pair of keys. In comparison to symmetric cryptography entities will have only one pre-shared key (the main disadvantage of symmetric ciphers).
https://ieeexplore.ieee.org/document/5380347/
Abstract: The research study is about the enhancement of symmetric cryptosystem. It gives support to integrity of data and information security, message non-repudiation, and key management scheme of the conventional symmetric cryptosystem.
https://quizlet.com/35346632/61-summarize-general-cryptography-concepts-flash-cards/
Symmetric key cryptosystems (or secret key cryptosystems) rely upon the use of a shared secret key. They are much faster than asymmetric algorithms, but they lack support for scalability, easy key distribution, and non-repudiation.
https://community.cisco.com/t5/security-blogs/cryptography/ba-p/3100259
Digital signatures can also provide non-repudiation, meaning that the signer cannot successfully claim they did not sign a message, while also claiming their private key remains secret; further, some non-repudiation schemes offer a time stamp for the digital signature, so that even if the private key is exposed, the signature is valid nonetheless.
https://security.stackexchange.com/questions/23565/when-using-symmetric-key-encryption-do-we-need-to-sign
Only someone with access to the symmetric key can generate a MAC of a message, so using authenticated encryption with a properly secured symmetric key is enough to authenticate the message. MACs do not provide non-repudiation because in symmetric cryptography the receiver also has the same secret key, so there's no way for the receiver to prove that the sender and not the receiver …
https://www.quora.com/How-is-non-repudiation-useful-to-encryption
I would argue that encryption is useful to non repudiation. Encryption is a tool, a lock if you will. Encryption simply stops you being able to understand data without the key to it. Non-repudiation is proof that you did something - that you cannot deny you are the author of something,...
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