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MMLU / Let HH be a Merkle-Damgard hash function is H:X^…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Let HH be a Merkle-Damgard hash function is H:X^{\leq L} \to TH:X^≤L  →T. Construct a MAC from this HH as follows: \ \ S(k,m) = H(k \| m)  S(k,m)=H(k∥m). This mac is insecure because:

choices

  1. Given H(k \| m)H(k∥m) anyone can compute H(w \| k \| m \| \text{PB})H(w∥k∥m∥PB) for any ww
  2. Given H(k \| m)H(k∥m) anyone can compute H(k \| m \| w)H(k∥m∥w) for any ww
  3. Given H(k \| m)H(k∥m) anyone can compute H(k \| m \| \text{PB} \| w)H(k∥m∥PB∥w) for any ww
  4. Anyone can compute H( k \| m )H(k∥m) for any mm

subject

computer_security

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Source and history

task_id
446f78d4-5130-5dd7-bff0-0db5ce3cd3ab
task_key
all--test--446f78d4-5130-5dd7-bff0-0db5ce3cd3ab
task_revision_id
1
config / split
all / test

Official source

initial import