Given that some signature schemes (for instance Elgamal) use an ephemeral key that cannot be reused ever. How do people usually protect against this? I'll elaborate more: if you reuse the ephemeral ...
The cryptocurrency Nextcoin has users create Curve25519 signing keys with a minimum length of 70 characters. Is that secure? Would it be better to use a random number generator? Is it possible to ...
In the test of this Java implementation of Ed25519, the signing key is generated this way: byte sk = new byte; Arrays.fill(sk, (byte)0); Is that correct? ...
I have only about 2 weeks of cryptography experience mostly in the form of questions on bitcoin.se. Is Curve25519-java up to date with current Curve25519 standards? Is Curve25519 itself secure? ...
The RSA signature operation is basically the same as encrypting with the private key. In particular, both operations use the same kind of keys. Is it safe to use the same RSA keypair both for ...