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Results tagged with cryptography
Search options questions only
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user 39
Questions about the construction and analysis of protocols and algorithms for secure computation and communication (including authentication, integrity, and privacy aspects).
4
votes
1
answer
129
views
Break an authentication protocol based on a pre-shared symmetric key, with message numbers
Consider the following protocol, meant to authenticate $A$ (Alice) to $B$ (Bob) and vice versa.
$$ \begin{align*}
A \to B: &\quad \text{“I'm Alice”}, R_A \\
B \to A: &\quad E(\langle 1, R_A\rangle, …
CommunityBot
- 1
13
votes
1
answer
408
views
Break an authentication protocol based on a pre-shared symmetric key
Consider the following protocol, meant to authenticate $A$ (Alice) to $B$ (Bob) and vice versa.
$$ \begin{align*}
A \to B: &\quad \text{“I'm Alice”}, R_A \\
B \to A: &\quad E(R_A, K) \\
A \to B …
