Hello, In another attempt at CBC I am trying to figure out where I have gone wrong in the following: Here is the table I created:

Plaintext binary	Plaintext hexidecimal	Ciphertext hexi	Ciphertext binary
0000	0	5	0101
0001	1	3	0011
0010	2	C	1100
0011	3	1	0001
0100	4	7	0111
0101	5	A	1010
0110	6	8	1000
0111	7	F	1111
1000	8	D	1101
1001	9	2	0010
1010	A(10	9	1001
1011	B(11	E	1110
1100	C(12)	6	0110
1101	D(13)	B	1011
1110	E(14)	4	0100
1111	F(15)	0	0000

| C1 C2

1100 0110 1010

Converted

A1 A2 A3

0010 1100 0101

P1 = | XOR A1 = 1110

P2 = C1 XOR A2 = 1010

P3 = C2 XOR A3 = 1111 I must be missing or wrote something wrong in my table. I'd appreciate guidance here.

The answer as per the quiz result is: M1 M2 B: 1100 0000

05 8 D 1 3 9 2 12 C A 9 3 1. 4 7 C 6 5 A DB 6 8 E 4 7 F FO This table shows how each of fthe 16 possible 4-bit block values is encrypted by a block cipher (directly, in ECB mode). The table uses Hexadecimal notation. Using Cipher Block Chaining mode (CBC) decrypt the following message. The first block is the initial block I=1100. 1 C1. C2 1100 0101 1010 05 8 D 1 3 9 2 12 C A 9 3 1. 4 7 C 6 5 A DB 6 8 E 4 7 F FO This table shows how each of fthe 16 possible 4-bit block values is encrypted by a block cipher (directly, in ECB mode). The table uses Hexadecimal notation. Using Cipher Block Chaining mode (CBC) decrypt the following message. The first block is the initial block I=1100. 1 C1. C2 1100 0101 1010