In this illustration, we see Bob on the left looking rightward. Below him is a sheet of paper. The sheet of paper is identified as "Long message: m," and contains the following message:

Dear Alice:

This is a VERY long letter since there is so much to say ... Bob

A blue arrow extends from this letter to the right, to a blue box labeled "Many-to-one hash function." A blue arrow extends from this box to the right, to a much smaller sheet of paper. This sheet of paper is identified as "Fixed-length hash: H(m)," and contains the following:

Opgmdvboijrtnsd

gghPPdogm;lcvkb