This is 123456, I don't know what kind of encryption it is and all the passwords are saving as it in my database so i need to know

  • you could have also googled this string and received an answer – schroeder May 31 '15 at 18:42

It is an unsalted SHA-1 hash:

$ echo -n 123456 | sha1sum
7c4a8d09ca3762af61e59520943dc26494f8941b  -

This is a one-way operation, a hash, which is not technically "encryption" as it can't be decrypted.

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    This answer also pretty much says "whatever system this is from, throw it out and never look back". About the only thing that could be worse, I think, would be an unsalted MD5 hash. – a CVn May 30 '15 at 22:07
  • Agree with @MichaelKjörling - unsalted SHA1 is a very weak method of password storage. – tlng05 May 31 '15 at 2:28

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