It depends on the Unix, etc. But, as the name Data Encryption Standard implies, DES is a standard, and many implementations of it exist. Certainly if there is anything, there should be DES. More up-to-date systems would have 3DES and RC4. But having it somewhere on the system does not mean it is available to all or particular applications. For example, if Netscape Messenger is on you have DES, 3DES, RC4 . . . but only inside of Netscape.
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