ECB or Electronic Codebook mode is supported by many encryption clients like FiSH and Mircryption however it is generally considered to be insecure. CBC or Cipher Block Chaining mode is not supported by FiSH but is supported by Mircryption. If you are going to use key exchange it is best to first find out if your peer has a client that can use CBC otherwise you will be able to see what they are saying, but they will not be able to read what you are saying.
A maioría dos clientes de cifrado, como FISH e Mircryption, admiten o modo ECB ou Libro de códigos electrónicos, aínda que en xeral se considera inseguro. FISH non admite o modo CBC ou Cipher Block Chaining, pero si Mircryption. Se vai empregar o intercambio de chaves é mellor averiguar antes se o pardispón dun cliente que poida empregar CBC; caso contrario, vostede poderá ver o que están a dicir, mais eles non serán quen de ler o que vostede está a dicir.