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A file whose size is 20 bytes is encrypted using the AES with CBC and OFB,...

A file whose size is 20 bytes is encrypted using the AES with CBC and OFB, respectively. What will be the size of each encrypted file?

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Answer #1

the actual file size provided is 20 bytes .

to do encryption we need several bytes to be padded based on encryption algorithm.

  • Padding is needed for ECB and CBC encryption modes because their inputs contain number of blocks, thus padding could ensure that. Block size depends on the algorithm: AES uses 16 byte blocks while Blowfish and 3DES use 8-byte blocks.
  • There is no need padding for encryption mode CFB and OFB because they are stream ciphers, in which the size of the block is usually fixed (one character).

Sizes of file after encrypted based on encryption algorithm.

1.AES= 32 bytes .

2.CBC=32 bytes.

3.OFB=20 bytes.

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