In DSA digital signature, why does k have to be random and unique each for each signing?
50473
How does the "biased-$k$ attack" on (EC)DSA work?
29772
How is uniq not unique enough that there is also uniq --unique?
58368
Proof of Unique Solution for Modular Exponentiation In Cryptography
105869
How to implement Certified Random in LaTeX
20480
Using the same RSA keypair to sign and encrypt
106628
Why should the primes used in RSA be distinct?
106215
Why are the lower 3 bits of curve25519/ed25519 secret keys cleared during creation?
18532
Why do I always get the same sequence of random numbers with rand()?
136965
SHA-256 "almost unique"?
15473
Why does HMAC use two different keys?
40158
Why is $H(k\mathbin\Vert x)$ not a secure MAC construction?
66942
How does order-preserving encryption work?
74774
Why should I use an Initialization Vector (IV) when I have unique keys?
45067
How unique is UUID?
15002
Unique (non-repeating) random numbers in O(1)?
38539
Why hash the message before signing it with RSA?
116647
The number of different ways to choose $k$ out of $n$ unique items