Late 1970s - Unix: DES-based crypt(3)

Unix 7th Edition crypt(3) is a cryptographic one-way hash function built upon the DES block cipher
"DES is, by design, hard to invert, but equally valuable is the fact that it is extremely slow when implemented in software."
Much faster software implementations of DES were devised later
"the algorithm is used to encrypt a constant [,which] can be made installation-dependent."
First known mention of local parameterization?
"Then the DES algorithm is iterated 25 times"
First known use of password stretching?