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Results tagged with public-key
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user 7777
An asymmetric cipher is an encryption scheme using a pair of keys, one to encrypt and a second to decrypt a message. This way the encrypting key need not be kept secret to ensure a private communication. Similarly in public key authentication, the verification key can be public and the signing key private.
4
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Fixed point in RSA encryption
Some papers count the number of the fixed points in the RSA encryption algorithm. They're a minimum of 9 and the real number depends on the smoothness of primes $p$ and $q$.
It very unlikely that a r …
- 3,354
3
votes
Accepted
Multi-key decryption
The problem you described is addressed and solved in different way by the Broadcast Encryption: roughly the problem is how to encrypt a message intended to more than one recipient.
You described a nai …
- 135
2
votes
Accepted
Can an adversary distinguish a private key from a pseudo-random string of the same length?
Usually choosing a safe password and standard parameter for the PBKDF2 key derivation would be enough protect your cipher. If PBKDF2 is correctly used, the symmetric key you get as output is well gene …
- 3,354
6
votes
Accepted
Why is Paillier Cryptosystem called probabilistic?
As user curious said in a other answer probabilistic means that the encryption of the same plaintext under the same key gives as output a different ciphertext.
This is a more general property and it …
- 3,354
3
votes
Accepted
How to use CRT to compute 4 square roots while decryption in Rabin Cryptosystem
As first step to compute the four square roots of $c \pmod N$ one can compute the two square roots $\mod p$ and the two square roots $\mod q$ and then using the Chinese Reminder Theorem combine them t …
- 3,354
1
vote
Is my protocol that uses hybrid cryptography and AES-GCM secure?
What your are describing is the typical use for public key cryptography. It is usually refereed to as KEM/DEM or Hybrid Paradigm. KEM/DEM stays for Key Encapsulation Method, Data Encapsulation Method. …
- 3,354
4
votes
DHE key exchange. Is it really secure?
A lot of modern cryptography is based on some mathematical assumptions and aims to achieve what is called Computational Security. That means that the adversary (Eve) could get some information about t …
- 3,354
3
votes
Accepted
rsa public and private keys
The key you wrote down contains a mixed alphabetic and digit symbols because it is written in its hexadecimal representation: i.e. using symbols from 0 to 9 and from A to F. More on this topic on Wiki …
- 3,354
12
votes
Accepted
Why the symmetric key layer in PGP?
I think you misunderstood a detail of PGP encryption. Only the random symmetric key is encrypted under the recipient's (asymmetric) public key. This way to encrypt stuff is quite common and is called …
- 6,176