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Stamp \& Extend -- Instant but Undeniable Timestamping based on Lazy Trees
undeniability forgery evidence
2014/3/6
We present a Stamp\&Extend time-stamping scheme based on linking via modified creation of Schnorr signatures. The scheme is based on lazy construction of a tree of signatures.
Stamp\&Extend returns a...
Cryptanalysis of Hwang-Chang’s a Time-Stamp Protocol for Digital Watermarking
Digital watermarks Copyright protection Time-stamping
2008/9/22
In 2005, Hwang et al. [17] proposed a time-stamping protocol for digit
watermarking. They claimed that their scheme is secure against attacks. However, in this
article, we will show that their schem...