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Meta: this may better fit security or even superuser; if it migrates take my answer along please. How big? A (full) TDES aka DESede key contains 168 bits of "real" key, but the stored form includes bits originally reserved for parity and today often ignored totalling 192 bits = 24 octets. "Two-key TDES" (TDEA keying option 2) has 112 "real" bits, stored ...

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