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Vigenere Cipher Collision

I have been reading the book "Serious Cryptography" by Aumasson to begin learning about Cryptography. There was a part where the author suggested how encryption using permutation should have these properties to be secured It should be a permutation, which is a rearrangement of the letters A to Z, such that each letter has a::Listen

I have been reading the book "Serious Cryptography" by Aumasson to begin learning about Cryptography. There was a part where the author suggested how encryption using permutation should have these properties to be secured

  1. It should be a
    permutation, which is a rearrangement of the letters A to Z, such that
    each letter has a unique inverse. For example, a substitution that
    transforms the letters A, B, C, and D, respectively to C, A, D, and B is a
    permutation, because each letter maps onto another single letter. But a
    substitution that transforms A, B, C, D to D, A, A, C is not a permutation,
    because both B and C map onto A. With a permutation, each letter has
    exactly one inverse.
  2. The permutation should be determined by the key
  3. Different keys should result in different permutations.
  4. The permutation should look random

For the first property, I wonder if Vigenere Cipher can be considered to be secured (focusly based on the these permutation rules above) since certain keys can result in collisions.

For e.g, Message = "ABBA" // Key = "BA"
=> Ciphertext = "BBCA", with "A" and "B" having collided result.

Bitcoin, Ethereum Could Become Commodities Under New CFTC Bill

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