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Make an excel doc with one column as the log of their student ID #'s and grade in the next column. Include a line at the top for instructions to take the log of their student ID # to find their grade. Label column headings appropriately

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nice idea but it would still violate the rules... student ID numbers are no different than names (so says the university)

I could ask each student to send me a password and I could post a symmetric encryption of their grade using their password ...

Is it a programming/math class? Tell them verbally it's their ID * 2, or something easy like that. You will not be breaking the rules and they can still see their grade. Ex: R589390 => R1178780

yeah it's a question of whether the university would still consider posting these altered IDs as private information... after all each student can still decrypt all IDs by dividing them by 2 (since the same encryption rule applies to all students).

I'm thinking the only way to do this is to have a student-specific password, either symmetric or public/private key pair

Tell the student to MD5-hash a text file with one line that looks like this?

ID9999999LastNameFirstNameWHATSMYGRADE

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