Can two different BASE64 encoded strings result into same string if decoded?

Question

On client side I am doing an MD5 encryption of a string and then a BASE 64 encoding on the hash generated.

This final encoded string is then used for comparison on serve

Answer 1

The accepted answer solves the problem but does not answer the question.

For example, these base64 values QzNWwq== and QzNWwr== encode the same binary value (hex) 433356c2

You can check it at http://kjur.github.io/jsjws/tool_b64udec.html or using the command

echo <> | base64 -d | xxd

In summary

• Two different base 64 encode same value --> true
• Two different values generate the same base64 value --> false (see this)