Explain the difference between CFB and OFB modes of block cipher operation. What mode is more reliable? Why?

Hints:

Ger IV CM- Om-11 IV Swing register Shiny register Shirt register 64-bit 64-bit 64 X64 164 64 164 864 K Encrypt K- Encrypt K Encrypt K Encrypt Encrypt K Encrypt 164 1264 X64 14 164 1964 Select car Trecard UNICOR bit Select Discard Select card Dcard bits bits 64-bit PM P P2 H C (a) Encryption C (a) Encryption IV CM IV ON- 6. 104 164 14 regher Shif geghter bits K k 164 Encrypt 164 X264 Encrypt 194 14 Decrypt 1994 K K- K Select Encrypt 464 Decrypt 864 Select Dincard 61 Encrypt 764 Dhard Select Dard Select Dhcard bles 6-les 64-bit Ci C C -C2 PM P3 (b) Deeryption Figure 3.13 s-bit Cipher Feedback (CFB) Mode PM P2 (b) Decryption Figure 3.14 s-bit Output Feedback (OFB) Mode