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Implement A CPA-secure construction for variable-length encryption; use CBC mode for domain extension.

Implement A CPA-secure construction for variable-length encryption; use CBC mode for domain extension.

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CBC(cipher block chaining) is most common block cipher mode in everyday use. It is used to achieve CPA security. CBC mode results in CPA secure encryption, it is no surprise that its encryption algorithm is randomized. CBC mode specifies that a random block is chosen, which is called initialization vector. It is included in output and as a result, encrypting l blocks under CBC mode results in l+1 blocks of output.blen

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