The leading bit during the byte (also the major bit in the 1st nibble) is flipped to help make 00000111, which happens to be 0x07, as revealed in the lower sample. append "one" little bit to information< // Notice: the input bytes are considered as little bit strings, // in https://sunwintixuonline18517.ka-blogs.com/86800716/what-is-md5-technology-an-overview