# Tag Info

### Hash of concatenated values (one public, one private)

Let's assume $A$ sends $h =\text{Hash(pv||key)}$ to $B$ with $pv$ is a public $48$-bit information. The aim of attacker is to access $key$ given $h$. This is postfix construction. The attackers must ...
• 43k

### Randomness and authentication on short value outputs (48 bits)

Does this scheme achieve my requirements? Does the truncation of the last 48 bits pose a security risk? The scheme is broken by a passive adversary who gets a single pair $(t,r)$. Observe that the ...
• 1,237
1 vote

### non-reversible additive cryptographic hash algorithm

I'm in hurry now, but I want to share with you some ideas (which if needed I'll detail next days): concatenation can be seen as $x||y = xk+y$ where $k=2^{|y|}$ so $f(x||y) = f(xk+y)$ if we assume $f$ ...
• 448
1 vote
Accepted

### Clarification on nonce collision calculation

I'm afraid that it's a significantly more complex calculation based on the mathematics of the birthday problem. Per the link, if we throw $n$ balls into $d$ buckets then the probability $p(n;d)$ of a ...
• 9,576

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