Compression is the reduction in size of data without losing information.

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Is compressing data prior to encryption necessary to reduce plaintext redundancy?

As explained in William Stallings' Book, in PGP encryption is done after compression, since it reduces redundancy. I couldn't relate encryption strength with redundancy. Could anyone explain more on ...
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How does compression before encryption leak info about the input?

Apparently current best practices recommend that you do not compress before you encrypt. For example in this blog entry (*): http://sockpuppet.org/blog/2013/07/22/applied-practical-cryptography/ It ...
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point decompression on a elliptical curve

I'm programming an elliptical curve cryptography system and I'm having difficulty with decompressing points. The following information is from my project specification as to my understanding: Given a ...