Classifier Instance:

Anchor text: Claude Shannon
Target Entity: Claude_Shannon
Preceding Context: Keys are used to control the operation of a cipher so that only the correct key can convert encrypted text (ciphertext) to plaintext. Many ciphers are based on publicly known algorithms or are open source, and so it is only the difficulty of obtaining the key that determines security of the system, provided that there is no analytic attack (i.e., a 'structural weakness' in the algorithms or protocols used), and assuming that the key is not otherwise available (such as via theft, extortion, or compromise of computer systems). The widely accepted notion that the security of the system should depend on the key alone has been explicitly formulated by Auguste Kerckhoffs (in the 1880s) and
Succeeding Context: (in the 1940s); the statements are known as Kerckhoffs' principle and Shannon's Maxim respectively.
Paragraph Title: Significance
Source Page: Key size

Ground Truth Types:

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Predicted Types:

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wordnet_authority_109824609-2.6975067478288026 0
wordnet_combatant_109939313-1.680468657036386 0
yagoGeoEntity-1.796097365952176 0
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