Strong secrecy is a term used in formal proof-based cryptography for making propositions about the security of cryptographic protocols. It is a stronger notion of security than syntactic (or weak) secrecy. Strong secrecy is related with the concept of semantic security or indistinguishability used in the computational proof-based approach. Bruno Blanchet provides the following definition for strong secrecy:
- Strong secrecy means that an adversary cannot see any difference when the value of the secret changes
For example if a process encrypts a message m an attacker can differentiate between different messages, since their ciphertexts will be different. Thus m is not a strong secret. If however, probabilistic encryption were used, m would be a strong secret. The randomness incorporated into the encryption algorithm will yield different ciphertexts for the same value of m.
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Famous quotes containing the words strong and/or secrecy:
“He is a strong man who can hold down his opinion. A man cannot utter two or three sentences, without disclosing to intelligent ears precisely where he stands in life and thought, namely, whether in the kingdom of the senses and the understanding, or, in that of ideas and imagination, in the realm of intuitions and duty.”
—Ralph Waldo Emerson (1803–1882)
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—Henry David Thoreau (1817–1862)