Today I learn cryptography from Mr. Zaki. Cryptography is to disguise information in such a way that its meaning is unintelligible to an unauthorized person. That mean although an unauthorized people gaining access to the information also don’t understand what they see. For example, HSPPW is a word that after encryption (process of converting ordinary information into unintelligible information), we do not know what the word meaning. But if we decrypt (process that moving from unintelligible information to ordinary information) it, it can mean DOLLS or WHEEL.
When the word in unintelligible form, we called it as cipher text while if the word in ordinary form, it is known as plain text. At the end of the lecturer, Mr. Zaki asks us to find the message behind the cipher text:
YMJ KPJQ UWNHJ BNQQ NSHWJFXJ YT WH KTZW GD SJCY BJJP
From the above cipher text, I take the BJJP as my first word to decrypt it. In my mind, if the cipher text is using substitution (one of the techniques of cryptography: replace original alphabet to other alphabet to make it unintelligible) then it is quite impossible is A. This is because it is hard to find xAAx word in English. After some try n error, I think the J is E, follow by K is F, L is G…….until I is D. Then the whole sentence is decrypt as:
When the word in unintelligible form, we called it as cipher text while if the word in ordinary form, it is known as plain text. At the end of the lecturer, Mr. Zaki asks us to find the message behind the cipher text:
YMJ KPJQ UWNHJ BNQQ NSHWJFXJ YT WH KTZW GD SJCY BJJP
From the above cipher text, I take the BJJP as my first word to decrypt it. In my mind, if the cipher text is using substitution (one of the techniques of cryptography: replace original alphabet to other alphabet to make it unintelligible) then it is quite impossible is A. This is because it is hard to find xAAx word in English. After some try n error, I think the J is E, follow by K is F, L is G…….until I is D. Then the whole sentence is decrypt as:
THE FKEL PRICE WILL INCREASE TO RC FOUR BY NEXT WEEK
Although I able to decrypt it, it still got 2 words which do not mean anything and I don’t know why?? =.=”
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