Update README
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README.md
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README.md
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@ -45,8 +45,7 @@ messaging service / privacy-preserving application.
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`key.detection_key` can be given to untrusted _adversarial_ servers.
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`key.detection_key` can be given to untrusted _adversarial_ servers.
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`gamma` is security property (_γ_) in the system. For a given gamma, a tag generated for a specific public key will
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`gamma` is security property (_γ_) in the system. For a given gamma, a tag generated for a specific public key will
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validate against a random public key with probability 2^-gamma. The actual value of gamma needed to protect the metadata
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validate against a random public key with a maximum probability of 2^-gamma.
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of a given application is specific to that application, the number of parties involved, the number of messages involved etc.
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## Generating Tags
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## Generating Tags
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@ -56,16 +55,15 @@ This tag can be attached to a message in a metadata resistant system.
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## Verifying Tags
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## Verifying Tags
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Extract a detection key for a given probability. This can then be
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First it is necessary to extract a detection key for a given false positive probability 0 <= 2^-n <= 2^-γ.
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given to an adversarial server can test a given tag against a detection key:
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This extracted key can then be given to an adversarial server can test a given tag against a detection key e.g.:
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let detection_key = key.extract(5);
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let detection_key = key.extract(5);
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if detection_key.test_tag(tag) {
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if detection_key.test_tag(tag) {
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// the message attached to this tag *might* be for the party associated with the detection key
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// the message attached to this tag *might* be for the party associated with the detection key
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} else {
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} else {
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// the message attached to this tag is definitely *not* for the party associated with the detection key.
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// the message attached to this tag is definitely *not* for the party associated with the detection key.
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}
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}
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