Guardamos el mensaje cifrado por si acaso.

Because guardamos can be either:

• present tense: we keep / we save
• preterite: we kept / we saved

This happens because the nosotros form of many -ar verbs looks the same in the present and the preterite.

So without more context, Guardamos el mensaje cifrado por si acaso could mean either:

• We keep the encrypted message just in case
• We kept the encrypted message just in case

In real conversation, context usually makes it clear.

Spanish often omits subject pronouns when the verb already shows who is doing the action.

• Guardamos already tells you the subject is we
• So nosotros guardamos is grammatical, but usually unnecessary

You would add nosotros only for emphasis, contrast, or clarity:

• Nosotros guardamos el mensaje, no ellos.
  We kept the message, not them.

Here, guardar means something like:

• to keep
• to save
• to store

It often implies putting something aside, preserving it, or not deleting it.

With digital things like messages, files, and emails, guardar is very common:

• guardar un archivo = to save a file
• guardar un mensaje = to save/keep a message

A learner might think of salvar, since English uses save, but in Spanish guardar is often the more natural everyday choice for this idea.

Cifrado means encrypted, coded, or encoded, depending on context.

In this sentence, mensaje cifrado means encrypted message.

It comes after the noun because in Spanish, adjectives usually come after the noun:

• mensaje cifrado
• carta importante
• archivo secreto

Also, cifrado agrees with mensaje, which is masculine singular:

• mensaje cifrado
• mensajes cifrados
• carta cifrada
• cartas cifradas

It is originally the past participle of cifrar (to encrypt / to encode), but here it is functioning like an adjective.

So grammatically, it behaves just like an adjective describing mensaje:

• el mensaje cifrado = the encrypted message

Spanish uses many past participles this way:

• la puerta cerrada = the closed door
• el documento firmado = the signed document
• el mensaje cifrado = the encrypted message

Por si acaso is a very common fixed expression meaning:

• just in case
• in case

It introduces the idea of taking a precaution.

So in this sentence, it means they are keeping the message as a precaution.

You can think of it as an idiomatic chunk. Learners often try to translate each word separately, but it’s better to learn por si acaso as one expression.

Other examples:

• Lleva agua por si acaso.
  Bring water just in case.
• Lo guardé por si acaso.
  I kept it just in case.

Because si without an accent means if.

• si = if
• sí = yes or oneself in some contexts

So:

• por si acaso = in case / just in case
• not por sí acaso

This is a very common spelling point for learners.

El is the definite article, meaning the.

Spanish uses articles more often than English in many contexts. Here it points to a specific message, not just any message.

• el mensaje cifrado = the encrypted message
• un mensaje cifrado = an encrypted message

If you changed it to un, the meaning would become less specific.

Yes, grammatically it could.

• Guardamos el mensaje cifrado por si acaso.
  suggests a specific encrypted message
• Guardamos un mensaje cifrado por si acaso.
  suggests an encrypted message, not necessarily one already known to the listener

So the difference is mainly specificity.

It actually can, depending on what comes next.

• por si often introduces a full clause:

  • Lo guardamos por si lo necesitamos.
    We kept it in case we need it.

• por si acaso is more of a complete expression meaning:

  • just in case

So in this sentence, por si acaso works on its own without needing another clause.

Yes. For learners of Latin American Spanish, por si acaso is the safest and most widely understood choice for just in case.

You may hear por acaso in some regions or varieties, but por si acaso is much more standard and broadly useful.

So if you are learning Spanish for Latin America, por si acaso is the expression to remember.

In most of Latin America, the c before i or e sounds like s.

So:

• cifrado sounds roughly like see-FRA-do
• acaso sounds roughly like a-KA-so

More specifically:

• ci = si
• ce = se
• ca, co, cu keep the hard k sound

So:

• cifrado → si-
• acaso → ka-

Yes, but the original order is the most neutral and natural.

Neutral order:

• Guardamos el mensaje cifrado por si acaso.

You might also hear:

• Por si acaso, guardamos el mensaje cifrado.

That version puts more focus on just in case.

Spanish word order is more flexible than English, but not every change sounds equally natural. The original sentence is a very standard way to say it.

Yes, in many modern contexts, especially with technology, encriptado is widely used and understood.

So both are possible:

• mensaje cifrado
• mensaje encriptado

However, some speakers and style guides prefer cifrado as the more traditional or precise term in Spanish.

For a learner, both are useful, but cifrado is an excellent word to know.

It could be either, depending on context.

• If talking about cybersecurity, apps, or communications, it probably means a digitally encrypted message
• In another context, it could mean a coded message in a more general sense

Spanish does not force that distinction here. The surrounding context would tell you which one is meant.