Michael Lamb

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We describe two homomorphic signature schemes for digital photographs such that an intermediate party in possession of a signed photograph can construct a scaled, cropped, and lossily compressed version of the photograph along with a new, valid signature, without knowing the private signing key. In other words, our signature schemes are simultaneously(More)
Using longitudinal data from Grades 8 to 11 of the 4-H Study of Positive Youth Development, a longitudinal study involving U.S. adolescents, we examined the developmental trajectories of multiple components of civic engagement, and the effects of youth development program participation and participation in another major domain of youth engagement (religious(More)
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