It seems the text is encrypted with the NULL encryption algorithm described in RFC 2410. If I run it through the accompanying decryption algorithm, it decrypts properly without error and gives the following plain text:
OH0fRX0gOHZgOH0tOH4fRX8tOr0gOHZgOH0tOH4fOrZgOH0fRX8tOH4gOHZgOH0tOr4gRX8tOr4fRX0gOHZfOH4fRX4fOr0tOrZgOr4tObZgRX4fOr4tOrZeRX4fOrZfRX0fOH4tOH0gRX0fRX0fOrZeRX4gOH4tOr4gRX0gOr4tOH0fOrZfOH4fRX4tOr0fOH4gRX8tOr4fRX4fOHZgOr4fRX0gRX4fRX0tObZgRX4fOr4tOrZeRX4fOH4tOr0fOrZfOHZgOH4tObZgOr4fRX4tOr0fOrZgOH0tOr0gRX8tOHZgOH0tObZgOr0fRX4gOr4tOr0tOr4tOH0tObZgOr0gRX0gOHZfOr0tOr0fRX8tOr0gOrZgOH0tOr4tOH4tOHZfOr4tOr0fOH4gRX4gOr0fOrZfOH4gOr4tOr4gOrZfOH4fRX4gRX0gOrZgOH0fOr4tObZgOrZgOr0fRX4gOr4tOH4fOr4gRX0fOH4tOr0fRX4gOH0tOr4gOrZgOr4fOr0tOH0gOr4tOH0gOH0tOr4fOH0tOH0gOr4tOr0fOH4fRX4gOr0fOrZfOr0fRX4gOr4tOr0tOH0fRX4fOr0gRX4gOr0fOrZgOr4fOr0tOH4fOr4gRX0fOr4fOHZgOr4fOr0tOH4fOr4gRX4gOr0fOrZgRX4gOHZgOr4tOr4fRX0fOH0tOr4tOH4fOrZfOr4gOHZgOr4fRX4fOr0gRX4gOH0tOr0gOrZfOrZfOr4tOH4fOrZgOH4fRX0fOr4tOr4fOH0tOr4gRX0gOrZgOr0fRX4fOH0gRX0gOH0fRX0gOr0tOH4fRX0
The plain text does not make much sense to me, however. But that’s the fundamental problem with data: There is no data to represent “no data”. Therefore, without any context information that restricts the set of valid strings to a true subset of all possible strings, we cannot possibly tell whether any sequence of characters is “data” or “garbage”. Only if we know what to expect, we can tell whether a given string matches that expectation or not.
Check out the Wikipedia article on Coding Theory for more information.
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solved What encryption type is this? [closed]