CODEWITHSUNDEEP
algorithmencryption
gelosie
gelosie

Reputation: 423

How to decrypt a string with unknown encryption algorithm?

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?

Upvotes: 5

Views: 49194

Answers (4)

Anam Fatima
Anam Fatima

Reputation: 41

Its Base 64 encryption.The above code is translated as:

如果你对我们在做的事情有兴趣，并且对rails/前端开发有自信，欢迎发送邮件到[email protected]预约交流时间，确定之后可以直接来到我们的工作室参观交流，谢谢

"If you are doing things we are interested in, and on the rails / front-end developers are confident, please send e-mail to communicate [email protected] appointment time, after determining the direct exchange of visits to our studio, thank you"

Upvotes: 1

Yann Ramin
Yann Ramin

Reputation: 33177

Well, the string is likely Base64 encoded. If you decode it, you should get an effectively random piece of binary data if its encrypted (EDIT: As others have shown, it isn't encrypted, but the following would still apply if it were)

By checking the length, you can determine the block-size of the cipher. If its not an even block size, it likely could be a stream cipher (or a block cipher operated in stream mode).

However, any more information will need to be gleamed from other sources - as the point of good encryption is to make the data truly opaque.

Upvotes: 1

Ryan Tse
Ryan Tse

Reputation: 1599

This string appears to be a Base64 encoded string.

The decoded value is: 如果你对我们在做的事情有兴趣，并且对rails/前端开发有自信，欢迎发送邮件到[email protected]预约交流时间，确定之后可以直接来到我们的工作室参观交流，谢谢

Upvotes: 1

Patashu
Patashu

Reputation: 21773

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:

如果你对我们在做的事情有兴趣，并且对rails/前端开发有自信，欢迎发送邮件到[email protected]预约交流时间，确定之后可以直接来到我们的工作室参观交流，谢谢

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.

Upvotes: 16

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