Below is a randomly generated ciphertext(*), each block representing 128 bits. Click on any portion to introduce errors. Below, you can see how the error propagates through decryption with different block cipher modes.
Ciphertext(*):
f 5 4 e a f 7 0 c c 3 9 c c 8 b 2 5 3 6 6 0 3 a e 8 d 3 b 8 f f
e 4 1 e 0 0 c 9 2 a b 2 6 a e d 5 7 a 9 9 c a 5 7 5 f 0 1 8 9 f
6 4 a 6 c 0 b 4 a 6 9 4 7 5 f 4 2 2 0 d 4 e c 2 8 a 8 c c c e 7
0 4 3 d e 3 6 c 9 8 7 5 d f b 0 4 d 8 e c 1 8 5 1 f 8 6 e 8 1 7
Decrypted:
ECB
2 5 5 7 4 d 9 e 5 8 0 8 4 7 9 b
e d 9 4 d e c 4 c 9 d c e 4 c a
e d 9 4 d e c 4 c 9 d c e 4 c a
b 8 f 7 b 5 5 d 0 8 1 f 3 1 8 6
d 3 b e f 6 e d a 6 9 a 3 f 7 6
d 3 b e f 6 e d a 6 9 a 3 f 7 6
5 0 4 f c a 3 1 1 e 2 1 7 5 4 2
0 2 e 4 0 c 6 a d 8 8 a 7 7 0 e
0 2 e 4 0 c 6 a d 8 8 a 7 7 0 e
a 8 5 7 0 8 e 7 d c c 2 5 a 1 d
a a b 0 c c 4 2 d e c 4 e 3 2 c
a a b 0 c c 4 2 d e c 4 e 3 2 c
CBC
2 5 5 7 4 d 9 e 5 8 0 8 4 7 9 b
e d 9 4 d e c 4 c 9 d c e 4 c a
e d 9 4 d e c 4 c 9 d c e 4 c a
b 8 f 7 b 5 5 d 0 8 1 f 3 1 8 6
d 3 b e f 6 e d a 6 9 a 3 f 7 6
d 3 b e f 6 e d a 6 9 a 3 f 7 6
5 0 4 f c a 3 1 1 e 2 1 7 5 4 2
0 2 e 4 0 c 6 a d 8 8 a 7 7 0 e
0 2 e 4 0 c 6 a d 8 8 a 7 7 0 e
a 8 5 7 0 8 e 7 d c c 2 5 a 1 d
a a b 0 c c 4 2 d e c 4 e 3 2 c
a a b 0 c c 4 2 d e c 4 e 3 2 c
OFB
0 0 1 0 0 1 0 1 0 1 0 1 0 1 1 1
0 1 0 0 1 1 0 1 1 0 0 1 1 1 1 0
0 1 0 1 1 0 0 0 0 0 0 0 1 0 0 0
0 1 0 0 0 1 1 1 1 0 0 1 1 0 1 1
1 1 1 0 1 1 0 1 1 0 0 1 0 1 0 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 0 0 1 0 0 1 1 1 0 1 1 1 0 0
1 1 1 0 0 1 0 0 1 1 0 0 1 0 1 0
0 1 0 0 1 1 0 1 1 0 0 1 1 1 1 0
0 1 0 1 1 0 0 0 0 0 0 0 1 0 0 0
0 1 0 0 0 1 1 1 1 0 0 1 1 0 1 1
1 1 1 0 1 1 0 1 1 0 0 1 0 1 0 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 0 0 1 0 0 1 1 1 0 1 1 1 0 0
1 1 1 0 0 1 0 0 1 1 0 0 1 0 1 0
1 0 1 1 1 0 0 0 1 1 1 1 0 1 1 1
1 0 1 1 0 1 0 1 0 1 0 1 1 1 0 1
0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 1
0 0 1 1 0 0 0 1 1 0 0 0 0 1 1 0
1 1 0 1 0 0 1 1 1 0 1 1 1 1 1 0
1 1 1 1 0 1 1 0 1 1 1 0 1 1 0 1
1 0 1 0 0 1 1 0 1 0 0 1 1 0 1 0
0 0 1 1 1 1 1 1 0 1 1 1 0 1 1 0
1 0 1 1 0 1 0 1 0 1 0 1 1 1 0 1
0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 1
0 0 1 1 0 0 0 1 1 0 0 0 0 1 1 0
1 1 0 1 0 0 1 1 1 0 1 1 1 1 1 0
1 1 1 1 0 1 1 0 1 1 1 0 1 1 0 1
1 0 1 0 0 1 1 0 1 0 0 1 1 0 1 0
0 0 1 1 1 1 1 1 0 1 1 1 0 1 1 0
0 1 0 1 0 0 0 0 0 1 0 0 1 1 1 1
1 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1
0 0 0 1 1 1 1 0 0 0 1 0 0 0 0 1
0 1 1 1 0 1 0 1 0 1 0 0 0 0 1 0
0 0 0 0 0 0 1 0 1 1 1 0 0 1 0 0
0 0 0 0 1 1 0 0 0 1 1 0 1 0 1 0
1 1 0 1 1 0 0 0 1 0 0 0 1 0 1 0
0 1 1 1 0 1 1 1 0 0 0 0 1 1 1 0
1 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1
0 0 0 1 1 1 1 0 0 0 1 0 0 0 0 1
0 1 1 1 0 1 0 1 0 1 0 0 0 0 1 0
0 0 0 0 0 0 1 0 1 1 1 0 0 1 0 0
0 0 0 0 1 1 0 0 0 1 1 0 1 0 1 0
1 1 0 1 1 0 0 0 1 0 0 0 1 0 1 0
0 1 1 1 0 1 1 1 0 0 0 0 1 1 1 0
1 0 1 0 1 0 0 0 0 1 0 1 0 1 1 1
0 0 0 0 1 0 0 0 1 1 1 0 0 1 1 1
1 1 0 1 1 1 0 0 1 1 0 0 0 0 1 0
0 1 0 1 1 0 1 0 0 0 0 1 1 1 0 1
1 0 1 0 1 0 1 0 1 0 1 1 0 0 0 0
1 1 0 0 1 1 0 0 0 1 0 0 0 0 1 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 1 0 0 0 1 1 0 0 1 0 1 1 0 0
0 0 0 0 1 0 0 0 1 1 1 0 0 1 1 1
1 1 0 1 1 1 0 0 1 1 0 0 0 0 1 0
0 1 0 1 1 0 1 0 0 0 0 1 1 1 0 1
1 0 1 0 1 0 1 0 1 0 1 1 0 0 0 0
1 1 0 0 1 1 0 0 0 1 0 0 0 0 1 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 1 0 0 0 1 1 0 0 1 0 1 1 0 0
CFB
2 5 5 7 4 d 9 e 5 8 0 8 4 7 9 b
e d 9 4 d e c 4 c 9 d c e 4 c a
e d 9 4 d e c 4 c 9 d c e 4 c a
b 8 f 7 b 5 5 d 0 8 1 f 3 1 8 6
d 3 b e f 6 e d a 6 9 a 3 f 7 6
d 3 b e f 6 e d a 6 9 a 3 f 7 6
5 0 4 f c a 3 1 1 e 2 1 7 5 4 2
0 2 e 4 0 c 6 a d 8 8 a 7 7 0 e
0 2 e 4 0 c 6 a d 8 8 a 7 7 0 e
a 8 5 7 0 8 e 7 d c c 2 5 a 1 d
a a b 0 c c 4 2 d e c 4 e 3 2 c
a a b 0 c c 4 2 d e c 4 e 3 2 c
CTR
0 0 1 0 0 1 0 1 0 1 0 1 0 1 1 1
0 1 0 0 1 1 0 1 1 0 0 1 1 1 1 0
0 1 0 1 1 0 0 0 0 0 0 0 1 0 0 0
0 1 0 0 0 1 1 1 1 0 0 1 1 0 1 1
1 1 1 0 1 1 0 1 1 0 0 1 0 1 0 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 0 0 1 0 0 1 1 1 0 1 1 1 0 0
1 1 1 0 0 1 0 0 1 1 0 0 1 0 1 0
0 1 0 0 1 1 0 1 1 0 0 1 1 1 1 0
0 1 0 1 1 0 0 0 0 0 0 0 1 0 0 0
0 1 0 0 0 1 1 1 1 0 0 1 1 0 1 1
1 1 1 0 1 1 0 1 1 0 0 1 0 1 0 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 0 0 1 0 0 1 1 1 0 1 1 1 0 0
1 1 1 0 0 1 0 0 1 1 0 0 1 0 1 0
1 0 1 1 1 0 0 0 1 1 1 1 0 1 1 1
1 0 1 1 0 1 0 1 0 1 0 1 1 1 0 1
0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 1
0 0 1 1 0 0 0 1 1 0 0 0 0 1 1 0
1 1 0 1 0 0 1 1 1 0 1 1 1 1 1 0
1 1 1 1 0 1 1 0 1 1 1 0 1 1 0 1
1 0 1 0 0 1 1 0 1 0 0 1 1 0 1 0
0 0 1 1 1 1 1 1 0 1 1 1 0 1 1 0
1 0 1 1 0 1 0 1 0 1 0 1 1 1 0 1
0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 1
0 0 1 1 0 0 0 1 1 0 0 0 0 1 1 0
1 1 0 1 0 0 1 1 1 0 1 1 1 1 1 0
1 1 1 1 0 1 1 0 1 1 1 0 1 1 0 1
1 0 1 0 0 1 1 0 1 0 0 1 1 0 1 0
0 0 1 1 1 1 1 1 0 1 1 1 0 1 1 0
0 1 0 1 0 0 0 0 0 1 0 0 1 1 1 1
1 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1
0 0 0 1 1 1 1 0 0 0 1 0 0 0 0 1
0 1 1 1 0 1 0 1 0 1 0 0 0 0 1 0
0 0 0 0 0 0 1 0 1 1 1 0 0 1 0 0
0 0 0 0 1 1 0 0 0 1 1 0 1 0 1 0
1 1 0 1 1 0 0 0 1 0 0 0 1 0 1 0
0 1 1 1 0 1 1 1 0 0 0 0 1 1 1 0
1 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1
0 0 0 1 1 1 1 0 0 0 1 0 0 0 0 1
0 1 1 1 0 1 0 1 0 1 0 0 0 0 1 0
0 0 0 0 0 0 1 0 1 1 1 0 0 1 0 0
0 0 0 0 1 1 0 0 0 1 1 0 1 0 1 0
1 1 0 1 1 0 0 0 1 0 0 0 1 0 1 0
0 1 1 1 0 1 1 1 0 0 0 0 1 1 1 0
1 0 1 0 1 0 0 0 0 1 0 1 0 1 1 1
0 0 0 0 1 0 0 0 1 1 1 0 0 1 1 1
1 1 0 1 1 1 0 0 1 1 0 0 0 0 1 0
0 1 0 1 1 0 1 0 0 0 0 1 1 1 0 1
1 0 1 0 1 0 1 0 1 0 1 1 0 0 0 0
1 1 0 0 1 1 0 0 0 1 0 0 0 0 1 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 1 0 0 0 1 1 0 0 1 0 1 1 0 0
0 0 0 0 1 0 0 0 1 1 1 0 0 1 1 1
1 1 0 1 1 1 0 0 1 1 0 0 0 0 1 0
0 1 0 1 1 0 1 0 0 0 0 1 1 1 0 1
1 0 1 0 1 0 1 0 1 0 1 1 0 0 0 0
1 1 0 0 1 1 0 0 0 1 0 0 0 0 1 0
1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0
1 1 1 0 0 0 1 1 0 0 1 0 1 1 0 0
(*) In the background, the same cleartext is encrypted and decrypted with each mode, the visible ciphertext is created using AES128-CBC and acts as a stand-in. Clicking a hex number will always flip the last bit of the 4 bits it represents in each ciphertext.