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Table 2 Comparison of keyspace size and compression ratio

From: Scrambling-based speech encryption via compressed sensing

  Proposed Hadamard [[4]] Latin Square [[6]] ASVDS [[7]] Chaos [[12]]
Keyspace O(10n 2) O(10n(n!)2 O(10120) O(n2) O(1064)
Compression ratio 1:1 1:1 1:1 1:1 1:1