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Questions tagged [hybrid-encryption]

Hybrid encryption combines secret-key and public-key cryptography into an encryption scheme.

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A paper question about the security of hybrid encryption scheme

Why the decryptor can still use K to access the data even when K is updated? QAQ
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What is this called: encrypt $X$ with key $E$, decrypt $X$ with key $D$?

I am a software developer interested in developing an application with cryptography. I can explain what I want to accomplish, but I do not know the technical terms for the cryptographic functions I am ...
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Can I replace DH by a post-quantum key exchange in IBAKE for post-quantum identity-based authenticated key exchange?

IETF RFC 6539 IBAKE - Identity Based Authenticated Key Exchange describes a Hybrid key exchange using both Identity based cryptography and a standard ephemeral elliptic curve Diffie-Hellman key ...
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How many keys in a Hybrid Cryptosystem?

If symmetric cryptosystems have $C^2_n$ keys, and asymmetric systems have $2n$ keys, how many does a hybrid system have? This was in an online quiz from school Company A is considering to adopt ...
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Commitment scheme: hiding property

Given two commitment schemes $Com_1, Com_2$ (both have the hiding property), I'd like to prove $Com_1(m) || Com_2(m)$ is also hiding. I built these hybrids and want to show $H_0 =_c H_1 =_c H_2$. \...
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Newbie - Hybrid Symetric and Asymetric

Just looking for a bit of an explanation on the concept of hybrid symmetric and asymmetric encryption. My understanding: Client requests public key from https://site1.com The client receives the ...
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Given paramaters of an Edward's curve and x, determine a y value if it exists

I'm making a demonstration cryptosystem using ECC ElGamal. I've currently got a working implementation of Edward's Curve operations and a basic ElGamal implementation (Encrypts only points on the ...
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How to securely map messages to points on an elliptic curve

I'm implementing a demonstration hybrid cryptosystem in Python (FinCrypt, I know the name is bad) and I'm migrating over from my Weierstrass curve implementation, which was based off of this, to one ...
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Encrypting with Asymmetric keys

I'm designing a system where the client asked for documents to be encrypted with "asymmetric cryptography". I've explained them that the best practice is to encrypt the data with a symmetric ...
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When do I need to use hybrid cryptography?

I need to provide confidentiality for a protocol. The protocol message size is between 100 bytes to 500 bytes. Do I need to use asymmetric encryption or hybrid cryptography?
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Encrypt with elliptic curves [closed]

The last days I was looking for a way to encrypt using ECC, without having to make the program myself. I was sure that someone should have done it for everyone by now. The best approach I had was ...
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In cryptography is there such as thing as disguising unencrypted text?

Just wondered: I currently have TrueCrypt on my system (I am aware that there are various doubts about its penetrability, and that it is no longer under development). TC "volumes" obviously consist ...
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RSA hybrid decryption via PKCS#11 - unwrap or decrypt?

I have an application that does RSA hybrid encryption/decryption – i.e., messages are encrypted with a fresh AES key, which is then itself encrypted with RSA-OAEP and sent with the message. Decryption ...
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Using HKDF to derive symmetric keys from a hybrid public-key encryption scheme

RFC 5869 describes HMAC-based Extract-and-Expand Key Derivation Function (HKDF). In section 4, entitled "Applications of HKDF", it states that one of the intended uses is: derivation of symmetric ...
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Doing RSA-KEM with RSA-OAEP

I am fiddling around with the JS Web Crypto API and creating a hybrid encryption system that uses a symmetric key to encrypt form data with AES256-CBC and and a public/private key-pair to wrap/...
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Is a signature scheme using a hash considered a hybrid cryptosystem?

In Wikipedia there is a page on hybrid cryptosystems. However, although cryptography contains a lot more than just encryption, only hybrid encryption using key encapsulation and data encapsulation is ...
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minimal overhead of ChaCha20 + ECC

What we want? Encrypt plaintext with ChaCha20 + ECC on curve 25519 (hybrid cryptography) the result would be a data stracture X. Input: public key on Curve 25519 No authentication required (no AEAD)...
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Can I overcome ElGamal malleability with AES preprocessing?

So textbook ElGamal is known to be vulnerable to CPA, and although there are several proposals (DHAES/EIES) for modifications none of those are formally accepted or standardized. My question is ...
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What is the “correct” way to authenticate hybrid encryption?

In hybrid encryption we use an asymmetric encryption scheme and the recipients public key to encrypt a symmetric encryption key $K$. I will denote the resulting ciphertext $C_A$. We then use a ...
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Would reuse of the symmetric key in a hybrid cryptosystem between files be inherently insecure?

This question stems from a UX problem where I want to allow the user to input their PIN only one single time when they open up an mobile app. Here are some properties of the application to provide ...
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How to do statistical analysis on encrypted / anonimized data

Let's imagine Alice wants to send Bob a table with 2 columns: ...
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Why is RSA still being used? [duplicate]

In hybrid encrytion, I still see that some site's use RSA in their https connection, so now I wonder, why do they not use ECC instead of RSA, ECC requires less computational power and encrypt's and ...
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Why is hybrid encryption more effective than other encryption scheme?

Currently I am learning about Hybrid Encryption but I was not able to find any good study material. Below is my understanding: One of the reason why we use ...
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1answer
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Symmetric encryption using RSA for random generated password

I'm fairly new to encryption, so I wanted to check the logic for a .net solution I'm working on that encrypts data between two parties. the receiving (decrypting) party will have an RSA key pair ...
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Multi-party encryption algorithm

To give some foreground information: I acknowledge that I am a cryptography newb and not by any means an expert (and probably never will be). In a recent CS class we had several assignments writing ...
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hybrid PKE scheme CCA2 insecurity

I'm reading "An Efficient CCA2-Secure Variant of the McEliece Cryptosystem in the standard model" by Rastaghi which states: As we know, in hybrid PKE schemes XOR alone cannot perfectly hide ...