El enigma incluye un cifrado.

Because enigma is one of the Spanish nouns that are masculine despite ending in -a. It comes from Greek, and several words of Greek origin behave this way.

So you say:

• el enigma
• un enigma
• los enigmas

This is something learners usually just memorize word by word. The ending -a often suggests a feminine noun, but not always.

Incluye is the third-person singular present tense form of the verb incluir.

So it can mean:

• he/she includes
• it includes
• you include (formal usted)

In this sentence, the subject is el enigma, which is singular, so incluye matches it:

• El enigma incluye... = The enigma includes...

This is because incluir is a verb whose stem changes slightly in many present-tense forms: a y appears before endings that begin with e.

Present tense:

• yo incluyo
• tú incluyes
• él/ella/usted incluye
• nosotros incluimos
• ellos/ellas/ustedes incluyen

That y helps with pronunciation and is part of the normal conjugation pattern for this verb.

Here, cifrado is acting as a noun.

You can tell because it is preceded by the article un:

• un cifrado = a cipher / an encryption / an encoded text, depending on context

But cifrado can also be an adjective or a past participle in other sentences:

• un mensaje cifrado = an encrypted message
• El mensaje está cifrado = The message is encrypted

So this word is flexible, but in your sentence it is being used as a noun.

They are related, but not identical.

• cifrado usually refers to a cipher, encryption, or something written in encoded form
• código usually means code in a broader sense

For example:

• un cifrado = a cipher system or encrypted writing
• un código = a code, set of rules, code number, computer code, etc.

So in a mystery or puzzle context, cifrado suggests something specifically encoded rather than just any kind of code.

Because cifrado is masculine in this sentence, so it takes the masculine singular article un.

Spanish articles must agree with the noun’s gender and number:

• un cifrado = masculine singular
• una cifra = feminine singular

Notice that cifra and cifrado are different words, so their articles are different too.

Because the personal a is mainly used before specific human beings and sometimes pets or personified beings.

Here, un cifrado is a thing, not a person, so no a is used:

• El enigma incluye un cifrado.

Compare:

• Veo un libro. = no personal a
• Veo a María. = personal a

So this sentence follows the normal rule.

The normal, neutral order is:

• El enigma incluye un cifrado.

That is subject + verb + object, just like in English.

You can change word order in Spanish, but it usually adds emphasis, sounds literary, or changes the focus. For example:

• Un cifrado incluye el enigma.
  This changes the meaning: now the cipher is the subject.

• Incluye un cifrado el enigma.
  This is grammatically possible in some contexts, but it sounds marked or unusual.

So for most situations, the original order is the best one to use.

A simple learner-friendly pronunciation is:

el eh-NEEG-mah een-KLOO-yeh oon see-FRAH-doh

A few helpful notes:

• g in enigma sounds like the g in go
• ll and y often sound similar in most of Latin America
• c before i in cifrado sounds like s in Latin American Spanish

So cifrado begins with an s sound, not a th sound.

Yes. In this sentence, incluye is a normal present-tense verb and works much like English includes.

So:

• El enigma incluye un cifrado. = The enigma includes a cipher.

Spanish present tense can sometimes also cover ideas like is including depending on context, but the most direct reading here is simply includes.

Sometimes, yes. Enigma in Spanish is very close to English enigma, but depending on context it can overlap with ideas like mystery or puzzle.

Still, it is not always exactly the same as:

• acertijo = riddle
• misterio = mystery
• rompecabezas = puzzle

So enigma usually keeps a slightly more formal or mysterious tone. The best translation depends on the context, even though the grammar of the sentence stays the same.