They may be a person-way features – Which implies that it's unfeasible to make use of the hash benefit to figure out what the original enter was (with present technology and tactics). The ultimate sixty four bits of your padded message symbolize the size of the first information in bits, https://sethxsldv.wssblogs.com/33523710/new-step-by-step-map-for-what-is-md5-technology