CRYPTO NEWS

Practical necessity of semantic security under chosen plain text attack (CPA) in CBC mode

I was not able to understand why we practically need a CPA security in Cipher Block Chaining, which insist on having a random IV. Let’s say if the encryption is not CPA secure, i.e. the adversary can identify two ciphertext are same and conclude the two plaintext would have been the same. Of what use is this information for adversary? I see he is able to know that both the message are same, so what? I think he can’t find the plaintext.

In other words is CPA security is strictly an academic definition of security. Does in practice attacker can extract the plaintext out of this?

Practical necessity of semantic security under chosen plain text attack (CPA) in CBC mode

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