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[Imported from Trac: page TaggedHash, version 2]

zooko 2007-05-04 14:18:52 +00:00
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TaggedHash.md

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Each place a hash function is used within Tahoe, the data to be hashed is first prepended with a distinct "tag", one per purpose.
These tags are encoded as a [NetString](NetString), to insure that they cannot be confused with the data being hashed. For example, the [VerifierId](VerifierId) is computed as the SHA-256 hash of the following string:
These tags are encoded as a [netstring](http://cr.yp.to/proto/netstrings.txt), to insure that they cannot be confused with the data being hashed. For example, the [VerifierId](VerifierId) is computed as the SHA-256 hash of the following string:
```
"23:allmydata_verifierid_v1," + DATA
```