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Agile Blog[^]:
The number of seconds since the very beginning of 1970, known as Unix time, is often maintained in a single variable in the computer’s operating system. When Unix was first designed, this number was stored in 32 bit variable. That means that the number could range from 0 to 232. Zero corresponds to the midnight January 1, 1970 (UTC). So what time does 232 correspond to? That will be 3:14:07 (UTC) on January 19, 2038. Bad things will happen then to computers that still are still using 32 bit integers to store Unix time.

Two-step authentication, cryptography and a little introduction to Message Authentication Codes (MAC).