Tagged Questions
3
votes
1answer
179 views
A discrete-log-like problem, with matrices: given $A^k x$, find $k$
Let $p$ be a large prime; we will work in $GF(p)$. Let $A$ be a $n\times n$ matrix. Also, let $x$ be a $n$-vector and $k$ a positive integer.
Suppose we are given $p$, $A$, $x$, and $y$. The goal ...
3
votes
0answers
125 views
Finding where I am in a linear recurrence relation
Suppose I have a linear recurrence relation
$$a(n) = c_1 a(n-1) + \dots + c_k a(n-k) + d,$$
where the constants $c_1,\dots,c_k,d$ are given and the initial values $a(0),\dots,a(k-1)$ are given as ...
2
votes
3answers
193 views
Discrete log problem, when we have many examples
Suppose I have many instances of the discrete log problem, all using the same unknown exponent. Is this problem easier than the standard discrete log problem?
Oh, heck, I should be more precise. ...
