Help on Symmetric Cryptography algorithm

[kiran]

Hi ,
I need some helpon Symmetric Crptography algorithm. My friend has given a
encrypted message ( encrypted using Symmetric cryptogrraphy algorithm and he
does 't mention on which plat form is used ) . I have to decrypt the the
encrypted message. I tried to decryppt using Symmetric class provided in
..NET library. But it is aksing saltkey,IV information to decrypt. Can't we
do decrpt with out using saltkey,IV....? I want to decrypt the encrypted
message with differenct possible keys.. How can I do this..?

 

[Jon Skeet [C# MVP]]

I need some helpon Symmetric Crptography algorithm. My friend has given a
encrypted message ( encrypted using Symmetric cryptogrraphy algorithm and he
does 't mention on which plat form is used ) . I have to decrypt the the
encrypted message. I tried to decryppt using Symmetric class provided in
.NET library. But it is aksing saltkey,IV information to decrypt. Can't we
do decrpt with out using saltkey,IV....? I want to decrypt the encrypted
message with differenct possible keys.. How can I do this..?

You can only decrypt the message using the same salt, key and IV that
your friend used when encrypting it. If you could decrypt it with any
old key, it wouldn't be much of an encryption algorithm, would it?