August 1999
Intermediate to advanced
1000 pages
83h 9m
English
/usr/bin/crypt [password] crypt encrypts and decrypts the contents of a file. crypt reads from the standard input and writes on the standard output. The password is a key that selects a particular transformation. If no password is given, crypt demands a key from the terminal and turns off printing while the key is being typed in. crypt encrypts and decrypts with the same key, as shown in the following example.
castle% crypt key < clear.file > encrypted.file castle% crypt key < encrypted.file | pr
Files encrypted by crypt are compatible with those treated by the editors ed(1), ex(1), and vi(1) in encryption mode.
The security of encrypted files depends on three factors:
The fundamental ...
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