- Type 4 encryption
NSAterminology, a Type 4 algorithm is an encryptionalgorithm that has been registered with NISTbut is not a Federal Information Processing Standard(FIPS). Type 4 algorithms may not be used to protect classified information.
Alternatively, some sources use "Type 4" specifically to refer to exportable algorithms — once limited to 40-bit keys — which can be relatively easily broken with even a modest amount of computing power.
Type 1 encryption
Type 2 encryption
Type 3 encryption
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