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Find cryptography algorithm in POST form

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I have client native app (vc++), it is packed by themida. Each time this app client send POST form data to server, data is encrypted with random key. Here is 1 example
plain_text: hello
data after encrypted something like:
encrypted_text = 6NTkCAvY7NqYFz5lU1JjNQ==

EncKey = ZCj35hEvmxMOQPrzYzov8CsOpKJayFoRUoc98FGTnnkUi+YZW5pzNHXhCuvKKqq4RAATdn1qSsZ558i2cS2ClfvXvfb3OQEgBj9+GcdMMBasdKGYu88hxFfELkqWKxyZijY+UCVvE8KLv0+65nMzbvQ12OJGRhE1JJd1FCtW+qU=

(EncKey is random and always 172 characters).
I want to have algorithm to gen EncKey and algorythm to encrypt/decrypt data
code should be .NET or PHP

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Offentlig avklaringstavle

RedLayers
- 5 år siden
There's a clear "security flaw" in your concept, please message me (because I can't message you) and I'll send a full explanation on why this is "bad" and missing a lot of things.
- 5 år siden
SovDyn
- 5 år siden
The information provided doesn't say a lot about the algorithm because a plenty of block ciphers (AES, Blowfish, RC2 etc) and their numerous variations (CBC, ECB etc) would produce something very similar. Is this encrypted text produced by encrypting "hello" with this particular key? Or is it just an example?
- 5 år siden