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- MAKEKEY User Commands MAKEKEY
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- NNAAMMEE
- makekey - generate encryption key
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- SSYYNNOOPPSSIISS
- mmaakkeekkeeyy
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- DDEESSCCRRIIPPTTIIOONN
- _M_a_k_e_k_e_y improves the usefulness of encryption schemes
- depending on a key by increasing the amount of time required
- to search the key space. It reads 10 bytes from its stan-
- dard input, and writes 13 bytes on its standard output. The
- output depends on the input in a way intended to be diffi-
- cult to compute (that is, to require a substantial fraction
- of a second).
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- The first eight input bytes (the _i_n_p_u_t _k_e_y) can be arbitrary
- ASCII characters. The last two (the _s_a_l_t) are best chosen
- from the set of digits, upper- and lower-case letters, and
- `.' and `/'. The salt characters are repeated as the first
- two characters of the output. The remaining 11 output char-
- acters are chosen from the same set as the salt and consti-
- tute the _o_u_t_p_u_t _k_e_y.
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- The transformation performed is essentially the following:
- the salt is used to select one of 4096 cryptographic
- machines all based on the National Bureau of Standards DES
- algorithm, but modified in 4096 different ways. Using the
- input key as key, a constant string is fed into the machine
- and recirculated a number of times. The 64 bits that come
- out are distributed into the 66 useful key bits in the
- result.
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- _M_a_k_e_k_e_y is intended for programs that perform encryption
- (for instance, _e_d and _c_r_y_p_t(1)). Usually makekey's input
- and output will be pipes.
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- SSEEEE AALLSSOO
- crypt(1), ed(1)
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- Sprite v1.0 April 27, 1985 1
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