1st term exam marks are out

You can find them in the usual marks page. You can check both the exam mark (it appears in yellow bachground) and the final mark in purple font. Please be reminded that our pass mark is 5.00 points.

Marked exams are available online (for a limited time) and you can send me any request or correction that needs to be made by email.

Solved by hj43us

Last lecture tomorrow

We will finish chapter 5. You can read sections 8.3, 8.4 & 8.5 from the book. If time is available, we will have a short test at the end of the lecture.

Four secret messages for the holidays

Besides wishing you happy holidays, I want to give you some examples of encrypted messages.
Each decrypted message is a homework well done. So feel free to submit your responses to get extra credit.









1) SSB3aXNoIHlvdSBoYXBweSBob2xpZGF5cyBmb3IgeW91IGFuZCB5b3VyIGxvdmVk
IG9uZXMuCg==

2) Zkij te dej unfusj jee cksx veh renydw tqo. (spaces and symbols are preserved, substitution was used here).

3) Dye edaoiteeduexttsin u?  rperpt bs iovec nsoo d (transposition was used here).
Please note there may be two blank spaces, so let's print it again using monospaced charset:
Dye edaoiteeduexttsin u?  rperpt bs iovec nsoo d
................................................ 

4) psdo do qcvpsti tlqxbzt vy xvcvqzbsqwtpde ohwopdphpdvc whp psdo pdxt dp do cvp q eqtoqi edbsti (again this is just monoalphabetic substitution)

Please note this homework is no longer offered nor it will be marked any more.