encryption - Symmetric cryptography and salt -

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I need to encrypt two-way (symmetric) specific tokens. These tokens are likely to be repeated (e.g. Those people are the first names), but I do not want an attacker to conclude which encrypted token came from the same original tokens. Hello, there is a way to go for cryptography (hashing) in a way.

Is there a way that can work in symmetric cryptography, an alternative solution or alternative?

Yes used properly, symmetric encryption does not reveal anything about plain text It is not even fact that many plain-widths are the same.

Proper usage means choosing a method of operation that is an initial vector (IV) that is not ECB) and appropriately select the fourth (usually random bytes). Encrypting many plain areas with the same key and fourth allows this attack very much like ECB mode, and using a stable IV is a common mistake.

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