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Converting bytes16 to int128

I am working on a little decentralized game with a world made of plots. It has a map which links a location to a Plot struct. A location is saved as a bytes16 but represents two int64 (coordinates can be negative and the center is in 0, 0). How can I convert them to int64 (it seems I can only convert them to uint64)?

Here is what I tried:

    function convertToCoordinates(bytes32 input)         public         pure         returns (uint128 x, uint128 y)     {         bytes16 xbytes;         bytes16 ybytes;         (xbytes, ybytes) = split(input);          x = int128(int128(uint128(xbytes)) - 2**127 - 1);         y = int128(int128(uint128(ybytes)) - 2**127 - 1);     } 

Understating MITM in an example authentication protocol

Imagine that we have a protocol like this: B -> A: RB A -> B: {RB,B}k Goal: authenticate A to B K: a shared key between A and B {}k: encrypting by K After receiving {RB, B}k by B, B is able to authenticate A. but what if we have something like this: A ->::Listen

Imagine that we have a protocol like this:
B -> A: RB
A -> B: {RB,B}k

Goal: authenticate A to B
K: a shared key between A and B
{}k: encrypting by K

After receiving {RB, B}k by B, B is able to authenticate A. but what if we have something like this:
A -> C: {RB,B}k
C -> B: {RB,B}k
so in this case B will authenticate C instead of A, isn’t it?

Converting bytes16 to int128

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