How to find length of string after encryption using DBMS_CRYPTO package

Hi,
I am planning do data encryption using DBMS_CRYPTO package. I want to find how much will be string length after encryption.
e.g When I try to encrypt string of length between 1-15 characters it gives me encrypted string of 32 characters. When I try with 16 charcters encrypted string is of 64 characters.
Is ther any formula to calculate length of encrypted string?
Thanks
Pravin

The length change is dependent upon the algorithm you are using which can be a combination of cipher block, padding, and chaining.
The best solution is determine the method you are going to use and apply it to the l ongest possible strings you are going to proces, then add some safety margin. There iis no penalty for defining your column as VARCHAR2(4000).

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How to find length of string after encryption using DBMS_CRYPTO package

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