Definition 4. The code rate of an authentication scheme, denoted by R, is de- fined as the number of bits that can be authenticated by ▇▇▇▇▇ and ▇▇▇ with one bit of their initial, correlated strings. For traditional authentication codes, the code rate R is determined by the length of the source states divided by that of the encoding rules (authentication keys).
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Sources: Information Theoretic Secret Key Agreement, Information Theoretic Secret Key Agreement