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Security Dictionary
Can't tell 'smtp' from 'snmp'? Find the precise meaning of these and hundreds of other security-related terms in our convenient and up-to-date Security Dictionary.
unforgeable
(I) Cryptographic usage: The property of a cryptographic data
structure (i.e., a data structure that is defined using one or
more cryptographic functions) that makes it computationally
infeasible to construct (i.e., compute) an unauthorized but
correct value of the structure without having knowledge of one of
more keys. (E.g., see: digital certificate.)
(C) This definition is narrower than general English usage, where
"unforgeable" means unable to be fraudulently created or
duplicated. In that broader sense, anyone can forge a digital
certificate containing any set of data items whatsoever by
generating the to-be-signed certificate and signing it with any
private key whatsoever. But for PKI purposes, the forged data
structure is invalid if it is not signed with the true private key
of the claimed issuer; thus, the forgery will be detected when a
certificate user uses the true public key of the claimed issuer to
verify the signature.
