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Everything about Weak key

Key that is easy to break with a specific cipher

In cryptography, a weak key is a key, which, used with a specific cipher, makes the cipher behave in some undesirable way. Weak keys usually represent a very small fraction of the overall keyspace, which usually means that, a cipher key made by random number generation is very unlikely to give rise to a security problem. Nevertheless, it is considered desirable for a cipher to have no weak keys. A cipher with no weak keys is said to have a flat, or linear, key space. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Weak keyA 5-minute orientation
  2. Skim a recent paper: Experimental Single-Photon Quantum Key Distribution Surpassing the Fundamental Weak Coherent-State Rate LimitInfluential work since 2022
  3. Pick up a classic book: Financial managementThe most-reprinted book on the subject
  4. Read the landmark paper: Efficient and secure authenticated key exchange using weak passwordsCited 67 times
  5. Go sideways: Blowfish (cipher)A closely related topic
  6. Go sideways: Block cipherA closely related topic

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🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

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