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Broken schemes in last release  #276

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@adelapie

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@adelapie

Hello,

At CT-RSA 2021 Venema and Alpar presented attacks against 11 ABE schemes and two of them are implemented in the last version of CHARM: DAC-MACS and MA-ABE-YJ14:

Moreover, the YCT14 scheme was broken in 2019 and is also implemented in
CHARM: https://github.com/JHUISI/charm/blob/dev/charm/schemes/abenc/abenc_yct14.py

It is possible to mount decryption attacks against them.

References:

https://eprint.iacr.org/2020/460
https://www2.hci.uni-hannover.de/papers/Tan2019.pdf

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