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Results tagged with symmetric
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user 15063
Symmetric cryptosystems assume two communicating entities share a pre-established secret key.
8
votes
Accepted
Is there a correct way to generate a symmetric key?
GPG uses a Password-Based KDF (PBKDF, also known as a "password hash") to transform a password into a symmetric key. … For completeness, there are also Key-Based KDFs such as HKDF that can derive symmetric keys from other keys, but I suspect that's not what you're after. …
- 2,894
7
votes
1
answer
1k
views
Multi-target attacks on AES-CTR with a random nonce
128-bit block ciphers are vulnerable to multi-target attacks where the attacker seeks to attack a collection of keys instead of a single key. A simple example:
Generate keys $k_1, k_2, ...,k_{2^{40 …
- 2,894
2
votes
Accepted
Misuse-resistant authenticated encryption based on SHA-3/Blake2b and AES-CTR/ChaCha20
256-bit confidentiality
Let's assume that we're using AES256-CTR and a 256-bit hash. A new 256-bit key $S$ is derived for each message. Since AES256 requires a 256-bit key, there are no extra b …
- 2,894
10
votes
Why is hybrid encryption more effective than other encryption scheme?
Alice also needs to first decrypt the symmetric key and then decrypt the message. It almost seems like a double work. … Using hybrid encryption, we can perform a single expensive RSA encrypt operation on a symmetric key, and do all of the remaining work using fast symmetric encryption like AES-GCM. …
- 2,894