module 8.4: Encryption and Decryption

Slides/Videos

We’ve talked about data strings up to this point, but that we must also consider how to keep the data secure. This video shows the importance of encryption to cybersecurity.

Cyber Video.mp4

Self ASSESSMENT

The caesar shift - encrypt

Caesar's Shift on the Gettysburg Speech
Simply add +1 to the ASCII value of each plaintext character
Save the shifted values to a new ciphertext file
Follow along below with the trinket!

Encrypt Practice Problem.mp4

Note: The referenced "gettysburg.txt" is on the second tab of the trinket. You do not need to do anything to import it, it is already called in line 28 and will call the Gettysburg address.

Desired Output:

Gpvs tdpsf boe tfwfo zfbst bhp pvs gbuifst cspvhiu gpsui po uijt dpoujofou b ofx obujpo, dpodfjwfe jo mjcfsuz, boe efejdbufe up uif qspqptjujpo uibu bmm nfo bsf dsfbufe frvbm.        Opx xf bsf fohbhfe jo b hsfbu djwjm xbs, uftujoh xifuifs uibu obujpo, ps boz obujpo tp dpodfjwfe boe tp efejdbufe, dbo mpoh foevsf.        Xf bsf nfu po b hsfbu cbuumfgjfme pg uibu xbs.        Xf ibwf dpnf up efejdbuf b qpsujpo pg uibu gjfme, bt b gjobm sftujoh qmbdf gps uiptf xip ifsf hbwf uifjs mjwft uibu uibu obujpo njhiu mjwf.        Ju jt bmuphfuifs gjuujoh boe qspqfs uibu xf tipvme ep uijt.
        Cvu, jo b mbshfs tfotf, xf dbo opu efejdbuf, xf dbo opu dpotfdsbuf, xf dbo opu ibmmpx uijt hspvoe.        Uif csbwf nfo, mjwjoh boe efbe, xip tusvhhmfe ifsf, ibwf dpotfdsbufe ju gbs bcpwf pvs qpps qpxfs up bee ps efusbdu.        Uif xpsme xjmm mjuumf opuf, ops mpoh sfnfncfs xibu xf tbz ifsf, cvu ju dbo ofwfs gpshfu xibu uifz eje ifsf.
        Ju jt gps vt uif mjwjoh, sbuifs, up cf efejdbufe ifsf up uif vogjojtife xpsl xijdi uifz xip gpvhiu ifsf ibwf uivt gbs tp opcmz bewbodfe.
        Ju jt sbuifs gps vt up cf ifsf efejdbufe up uif hsfbu ubtl sfnbjojoh cfgpsf vt -        uibu gspn uiftf ipopsfe efbe xf ublf jodsfbtfe efwpujpo up uibu dbvtf gps xijdi uifz hbwf uif mbtu gvmm nfbtvsf pg efwpujpo -        uibu xf ifsf ijhimz sftpmwf uibu uiftf efbe tibmm opu ibwf ejfe jo wbjo -        uibu uijt obujpo, voefs Hpe, tibmm ibwf b ofx cjsui pg gsffepn -        boe uibu hpwfsonfou pg uif qfpqmf, cz uif qfpqmf, gps uif qfpqmf, tibmm opu qfsjti gspn uif fbsui.

Self ASSESSMENT

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