Challenge "Hill Cipher"  

  By: admin on Sept. 4, 2022, 10:11 a.m.

The historical Hill cipher uses matrix-vector multiplications to encrypt blocks of letters. Can you find the inverse matrix and recover the plaintext?

 Last edited by: robot.txt on Sept. 14, 2022, 11:20 a.m., edited 1 time in total.

Re: Challenge "Hill Cipher"  

  By: madness on Oct. 23, 2022, 9:55 p.m.

For those who come after us: From the challenge description, it is clear that the plaintext ends on a word boundary. You might think that you could save some time by assuming that it also begins on a word boundary. You would be mistaken.

Re: Challenge "Hill Cipher"  

  By: RandyWaterhouse on Oct. 24, 2022, 6:58 a.m.

Congrats on solving the challenge, madness! And you are right, you can't assume that the plaintext starts on a word boundary.

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