Difference between revisions of "CCZ-invariants for all known APN functions in dimension 7"

We consider the known instances of APN functions over GF(2^7). All of these 490 functions, with the exception of the inverse function ${\displaystyle x\mapsto x^{126}}$, have the Gold-like Walsh spectrum ${\displaystyle -16^{3556},0^{8128},16^{4572}}$. The inverse function has the Walsh spectrum ${\displaystyle -20^{889},-16^{889},-12^{1016},-8^{2667},-4^{889},0^{1905},4^{2667},8^{889},12^{1778},16^{1778},20^{889}}$.

All of these 490 functions have one of the 14 values 3610, 3708, 4026, 4034, 4038, 4040, 4042, 4044, 4046, 4048, 4050, 4270, 4704, 8128 as their ${\displaystyle \Gamma }$-rank. The following table lists the indices of the functions having each of the given ${\displaystyle \Gamma }$-rank.

Γ-rank Indices
3610 1,2
3708 3
4026 7
4034 8
4038 9
4040 10,11,12
4042 113, 119, 340
4044 13, 27, 36, 37, 41, 52, 54, 57, 91, 120, 146, 163, 194, 204, 212, 248, 277, 291, 300, 307, 318, 323, 337, 367, 392, 399, 401, 417, 421, 423, 432, 436, 488
4046 19, 21, 22, 24, 25, 29, 32, 34, 38, 40, 43, 47, 48, 49, 50, 51, 53, 55, 56, 60, 61, 63, 64, 65, 66, 70, 71, 74, 75, 76, 78, 80, 85, 90, 100, 102, 104, 105, 107, 109, 110, 111, 122, 126, 129, 131, 133, 136, 142, 148, 151, 153, 160, 161, 169, 170, 173, 174, 180, 182, 183, 187, 188, 191, 193, 197, 200, 202, 211, 213, 221, 231, 232, 233, 235, 236, 239, 241, 242, 243, 244, 247, 252, 256, 257, 258, 259, 262, 263, 264,268, 279, 283, 287, 290, 292, 298, 301, 302, 303, 304, 309, 312, 314, 315, 319, 326, 328, 333, 336, 341, 343, 344, 345, 347, 349, 351, 353, 357, 358, 359, 360, 363, 365, 366, 368, 370, 371, 373, 374, 375, 376, 379, 381, 384, 385, 389, 395, 396, 400, 404, 405, 406, 409, 411, 413, 419, 426, 429, 431, 435, 438, 441, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 460, 465, 472, 475, 476, 478, 479, 485, 487, 490
4048 14, 15, 16, 17, 20, 23, 26, 28, 31, 33, 39, 42, 44, 45, 46, 58, 59, 62, 67, 68, 69, 72, 73, 77, 79, 82, 83, 84, 86, 87, 88, 92, 93, 95, 96, 97, 99, 103, 106, 108, 112, 114, 115, 117, 118, 121, 123, 124, 125, 127, 128, 130, 132, 134, 135, 137, 138, 139, 140, 141, 143, 144, 145, 147, 149, 150, 152, 155, 156, 157, 158, 159, 162, 164, 166, 167, 168, 171, 175, 176, 177, 178, 179, 184, 186, 190, 192, 195, 196, 199, 201, 203, 205, 206, 207, 208, 210, 214, 215, 216, 217, 218, 219, 220, 222, 223, 224, 225, 226, 227, 228, 229, 234, 238, 240, 245, 249, 251, 255, 260, 261, 265, 266, 270, 271, 273, 275, 276, 278, 280, 281, 282, 285, 286, 288, 289, 293, 294, 295, 296, 297, 299, 310, 311, 313, 316, 317, 320, 321, 322, 324, 327, 329, 330, 332, 334, 335, 338, 339, 342, 346, 350, 354, 356, 361, 369, 372, 377, 382, 387, 390, 391, 393, 394, 398, 402, 407, 408, 412, 416, 418, 420, 424, 425, 427, 428, 434, 437, 440, 443, 444, 455, 456, 457, 458, 461, 462, 463, 464, 466, 468, 470, 471, 473, 477, 481, 482, 489
4050 18, 30, 35, 81, 89, 94, 98, 101, 116, 154, 165, 172, 181, 185, 189, 198, 209, 230, 237, 246, 250, 253, 254, 267, 269, 272, 274, 284, 305, 306, 308, 325, 331, 348, 352, 355, 362, 364, 378, 380, 383, 386, 388, 397, 403, 410, 414, 415, 422, 430, 433, 439, 442, 459, 467, 469, 474, 480, 483, 484, 486
4270 4
4704 5
8128 6

The 490 functions have six distinct Δ-ranks, viz. 198, 210, 212, 338, 436, 4928. The indices of the functions corresponding to each rank are given in the table below.

Δ-rank Indices
198 1,2,3
210 8, 10, 14, 15, 16, 18, 45, 260, 470
212 7, 9, 11, 12, 13, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490
338 4
436 5
4928 6

The 490 functions have five distinct values of the order of the multiplier group , viz. 128, 889, 896, 1778, 113792. The indices of the functions corresponding to each order are given in the table below.

Multiplier group order Indices
128 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490
889 4, 5
896 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
1778 6
113792 1,2,3