Rating:
### Solution:
RSC BGT FFH HFT TPD WMA OCZ CCD DCZ ZVA
He gave me some instructions related to it:
He told me he saw some names in call logs; those are: Felix Delastelle, Dmitri Mendeleev.
He also gave me 2 matrices A and B and told to perform the same operation on matrix A and B as performed on matrix P and Q. Find something related to biochemistry to crack my phone password.
```
Matrix A:
45 35 93 95 24 65
25 15 55 64 36 45
15 65 62 16 65 38
19 64 35 69 65 63
47 67 48 60 39 27
66 48 77 22 10 69
```
```
Matrix B:
33 25 30 11 68 65
83 36 19 33 55 51
20 16 48 63 41 71
30 42 12 25 31 37
51 03 44 23 43 85
20 39 28 41 01 70
```
```
Matrix P:
13 81 60
40 99 88
39 87 92
Matrix Q:
50 52 36
90 75 28
80 9 18
```
```
Result Matrix:
60 82 36
60 109 104
52 75 4
```
Solution:
BIFID CIPHER encoded:
RSC BGT FFH HFT TPD WMA OCZ CCD DCZ ZVA
* For key:
To find the key, multiply elements of matrix A (A[i][j]) with elements of matrix B (B[i][j]), then take mod of matrix elements of the result matrix, compare numbers of result matrix with the periodic table, then replace numbers with element notation and try to find a key related to biochemistry.
```
Matrix A (repeated):
45 35 93 95 24 65
25 15 55 64 36 45
15 65 62 16 65 38
19 64 35 69 65 63
47 67 48 60 39 27
66 48 77 22 10 69
```
```
Matrix B (repeated):
33 25 30 11 68 65
83 36 19 33 55 51
20 16 48 63 41 71
30 42 12 25 31 37
51 03 44 23 43 85
20 39 28 41 01 70
```
```
#include <iostream>
using namespace std;
int main() {
int a[6][6] = {
{45, 35, 93, 95, 24, 65},
{25, 15, 55, 64, 36, 45},
{15, 65, 62, 16, 65, 38},
{19, 64, 35, 69, 65, 63},
{47, 67, 48, 60, 39, 27},
{66, 48, 77, 22, 10, 69}
};
int b[6][6] = {
{33, 25, 30, 11, 68, 65},
{83, 36, 19, 33, 55, 51},
{20, 16, 48, 63, 41, 71},
{30, 42, 12, 25, 31, 37},
{51, 03, 44, 23, 43, 85},
{20, 39, 28, 41, 01, 70}
};
for (int i = 0; i < 6; i++) {
for (int j = 0; j < 6; j++) {
cout << (a[i][j] * b[i][j]) % 118 << " ";
}
cout << endl;
}
}
```
```
Result Matrix:
69 49 76 101 98 95
69 68 101 106 92 53
64 96 26 64 69 102
98 92 66 73 9 89
37 83 106 82 25 53
22 102 32 76 10 110
```
Corresponding Element:
Tm In Os Md Cf Am
Tm Er Md Sg U I
Gd Cm Fe Gd Tm No
Cf U Dy Ta F Ac
Rb Bi Sg Pb Mn I
Ti No Ge Os Ne Ds
Key: “aminoacids”
> DECODED CODON SEQUENCE:
UGC GCA CUG CUU GAG AGG GGG AUU UUU ACC
C A L L E R G I F T
(RESP. SEQUENCE WITH ACID NOTATION)
`Flag: VishwaCTF{CALLERGIFT}`
