The existing digital data verification methods are able to detect regions that have been tampered with,

but are too fragile to resist incidental manipulations.  This paper proposes a new digital signature

scheme which makes use of an image's contents (in the wavelet transform domain) to construct a

structural digital signature (SDS) for image authentication. The characteristic of the SDS is that it

can tolerate content-preserving modifications while detecting content-changing modifications. Many

incidental manipulations, which were detected as malicious modifications in the previous digital signature

verification or fragile watermarking schemes, can be bypassed in the proposed scheme.   Performance

analysis is conducted and experimental results show that the new scheme is indeed superb for image

authentication.

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Keyword: Digital signature, Wavelettransform, Authentication, Fragility, Robustness.

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