My company uses a very particular access control/authen/authorization system which depends, in part, on a cookie. The cookie has the usual "who is this nut?" information, but it also has a "signature" field. According to their description, this is a signature encrypted with the private key of a public/private pair.

My unlucky job is to use a public keyring and verify that the signature was encrypted with the proper private key. Along with that I will be checking the person's department, userid, and ip address. All of that is the authorization part. The MD5 signature is the authentication part.

Anyone have a quick answer to this? i.e. read the encrypted sig, and use the public key to verify it? The description uses the term "checksum". I'm unsure how they are using this term. . .

If you are more knowledgable than I in this, please help?

What does this little button do . .<Click>; "USER HAS SIGNED OFF FOR THE DAY"

In reply to MD5 Signature checking by tame1

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