How to decrypt a string with unknown encryption algorithm?

Question

How to decrypt a string with unknown encryption algorithm?

There is a string:

5aaC5p6c5L2g5a+55oiR5Lus5Zyo5YGa55qE5LqL5oOF5pyJ5YW06Laj77yM5bm25LiU5a+5cmFpbHMv5YmN56uv5byA5Y+R5pyJ6Ieq5L+h77yM5qyi6L+O5Y+R6YCB6YKu5Lu25YiwZ2hvc3RtNTVAZ2l0Y2FmZS5jb23pooTnuqbkuqTmtYHml7bpl7TvvIznoa7lrprkuYvlkI7lj6/ku6Xnm7TmjqXmnaXliLDmiJHku6znmoTlt6XkvZzlrqTlj4Lop4LkuqTmtYHvvIzosKLosKIK

I don't know the encryption algorithm. How to decrypt it?

To analyze and solve this problem, what should I learn?

Answer 1

It's not an encryption algorithm, it's base64. You can tell because of the +s.

http://www.opinionatedgeek.com/dotnet/tools/base64decode/

Try running it through this page, it'll turn into this:

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NOTE: If it was actually encrypted and you actually had no clue what it was encrypted with, you would be screwed, because any good encryption algorithm turns the output into meaningless gibberish, unusable without the key. Base64 has no key, you can just reverse it the same way every time.