# Quotes Surely. Cryptogram #5

Answers must include method of encryption along with plain text and explanation (explanation refers to thoughts or clues that made you think to do certain things).

## Cryptogram #5

cd, f, mq, ec, dq, tm, ah, ayw, ti, eo, caw, , ajg, dfu, , ens, aqc, yu, , fec, gvy, agk, aic, eqe, , fzo, z, , lw, ai, is, em, abc, cq, is, bvs, , bv, bou, ko, , ciq, fiq, cre, gs, ada, fog, , hrq, bma, aoa, fzo, dr, ke, , fe, abi, , atk, mw, is, , bri, cyw, qi, re, bys, , dbq, adm, , dgy, ep, hgs, bhq, akq, evy, gt, el, bq, y, ra,

Hint1:

Modified one of my earlier encryption method (it has been solved). Much easier.

Hint2:

123♛_abc♕123.

## 1 Answer

The plain text quote is:

"mathematics is the queen of sciences and number theory is the queen of mathematics"

The decryption method is:

1. The ciphertext is a variation of base-26 using just the letters of the alphabet
2. Translate from a-y to true base-26 (1-9-a-p). z translates to 10.
3. Convert from true base-26 to decimal.
4. Then recognize that each decimal number is a semiprime (the product of two prime numbers)
5. The first factors are the ordered prime numbers (2,3,5,7,11...) up to 101, then repeated
6. The second factors are the semiprimes / first factors
7. Then determine $n$ as the $n^{th}$ prime for each factor
8. Translate each $n$ to the $n^{th}$ letter of the alphabet

• nope, wrong plaintext. – RE60K May 23 '15 at 8:05
• many words are right a copule of them wrong maybe with the quote encrypted. – RE60K May 24 '15 at 12:24
• OK I'll tell you I thought I had encoded not "number theory" but something else, but I haven't verified again. – RE60K May 24 '15 at 18:06
• nope. just I encoded something like algebra or something else, I remember it was not number theory. – RE60K May 25 '15 at 5:40