由于杂凑值将大量资料表示成较小的数值，因此杂凑值可用于数位签章。
Hash values represent large amounts of data as much smaller numeric values, so they are used with digital signatures.
基本上数位签章是藉著套用数学函式于要被签名的资料的杂凑来计算。
Typically the digital signature is computed by applying a mathematical function to the hash of the data to be signed.
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