The problem in this sheet use the following alphabet. 64-letter alphabet abcdefg
ID: 3196938 • Letter: T
Question
The problem in this sheet use the following alphabet.
64-letter alphabet
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-
Angharad and Bedwyr are friends on Tinder and plan to meet for the first time next Saturday evening outside Angharad’s local town hall. Angharad has used Bedwyr’s public RSA key to send him the following enciphered message.
bludPJvpWMlLwdyCwCPW2HnxcFKL
Bedwyr’s public key
N=7231645985673347207280720222548553948759779729581
e=3
can be found on his Facebook page. Bedwyr didn’t listen properly in lectures and has also placed his deciphering key
d=4821097323782215625692549251331855329314609896043
on Facebook. To which one of the following towns will Bedwyr be travelling next Saturday?
(a) Llanymynech
(b) Llanuwchllyn
(c) Llanbedr-Pont-Steffan
(d) Llanfihangel-Glyn-Myfyr
(e) Llanrhaedr-ym-Mochnant
(f) Llanerchymedd
(g) Llanfairpwllgwyngyll
(h) Llanystumdwy
(i) Llangollen
(j) Llangefni
(k) none of the above
Explanation / Answer
(a) Llanymynech
(d) Llanfihangel-Glyn-Myfyr
(e) Llanrhaedr-ym-Mochnant
(i) Llangollen
(j) Llangefni
(h) Llanystumdwy
are the towns Bedwyr will be travelling next Saturday.
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