Table 3 Execution times (in seconds) of the different implementations. The row labeled as "packing" refers to the conversion from encrypted samplewise representation to encrypted composite representation. The row labeled as "DCT" refers to the actual DCT computation.
From: Encrypted Domain DCT Based on Homomorphic Cryptosystems
| IDCT | F-IDCT | B-IDCT | BF-IDCT |
|---|---|---|---|---|
packing | — | — | 20.6 | 51.2 |
DCT | 164.2 | 79.8 | 7.2 | 10 |
total | 164.2 | 79.8 | 27.8 | 61.2 |
| IDCT | F-IDCT | B-IDCT | BF-IDCT |
packing | — | — | 83.8 | 208.2 |
DCT | 663.2 | 319.7 | 29 | 40 |
total | 663.2 | 319.7 | 112.8 | 248.2 |
| IDCT | F-IDCT | B-IDCT | BF-IDCT |
packing | — | — | 334.4 | 850 |
DCT | 2647.7 | 1277.1 | 115.2 | 159.6 |
total | 2647.7 | 1277.1 | 449.6 | 1009.6 |
