ftie-cp

Compile Instruction

g++ -o bin/ftie-cli -std=c++17 ftie/*.h ftie/*.cpp main.cpp `libpng-config --ldflags` -lgmpxx -lgmp

On macOS with Homebrew, Clang doesn't search /opt/homebrew by default and also errors on the ftie/*.h glob when treated as separate translation units, so use instead:

g++ -o bin/ftie-cli -std=c++17 -I/opt/homebrew/include -L/opt/homebrew/lib ftie/*.cpp main.cpp `libpng-config --cflags --ldflags` -lgmpxx -lgmp

Requirements

• g++ (Ubuntu 8-20180424-0ubuntu1~16.04.1) 8.0.1 20180424 (experimental) [trunk revision 259590]
• png++-0.2.9
• gmp/gmpxx (arbitrary-precision arithmetic for the BBS modulus) — brew install gmp on macOS, or the libgmp-dev package on Linux.

Generating BBS primes

P/Q need to be ~1024-bit primes congruent to 3 mod 4 (so the BBS modulus P*Q is ~2048 bits). Generate one at a time:

./bin/ftie-cli genprime 1024

Run it twice to get distinct P and Q, then pass the printed decimal values as CLI args to encrypt/decrypt.

System Block Diagram

Deprecated System Block Diagram [1]