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I am considering to use CBC to encrypt a block of data. Dose it make a sense to use CBC if the data to be encrypted is smaller than 2 blocks ?
For example data block size for AES is 128 bits, and total data to be encrypted is less than 256 bits.
I appreciate your inputs.
Yes, even if it is 1 block in size it makes sense. This is because the IV is XOR’ed with the first block. This means that even if you encrypt 2 identical plain text segments the resulting cipher text will be distinct.
Don’t forget about CWE-329.