SECAI Core · phase 10 of 15 · noun

Encryption

Scrambling the characters used in a message so that the message can be seen but not understood or modified unless it can be deciphered. Encryption provides for a secure means of transmitting data and authenticating users. It is also used to store data securely.

The Explain card

Plain English
Encryption turns readable data into scrambled text using a key, so anyone without the key sees only noise. It protects data in transit, data at rest, and can help prove who you are talking to.
Example
An AI platform stores uploaded fine-tuning datasets encrypted with AES-256 in object storage. A leaked backup bucket then yields ciphertext, not customer records, because the key lives elsewhere.
Why it matters
Training data, prompts, and model weights are valuable targets. Encrypting them limits the blast radius of a breach and keeps eavesdroppers out of the API traffic between apps and models.
Hook
A locked diary in plain sight: everyone can see the book, only the key holder can read it.

Word knowledge

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

The gateway applies encryption to camera footage before sending it from the warehouse network to the cloud archive.

How it is built
  • en- prefix in, into, or cause to be
  • crypt root hidden
  • -ion suffix act, process, or result
Where it came from
Origin
English encrypt plus -ion; encrypt combines en- with crypt, ultimately from Greek kryptos, meaning hidden
Entered the language
1940s
What changed
The noun began in general cipher terminology and gained a specialized computing and telecommunications sense in the 1960s.
How it is spelled
Pattern
The Greek-derived root crypt keeps y between consonants.
Pattern
When -ion follows a base ending in t, the ending is spelled -tion.

Spelled like

  • cryptic
  • cryptography
  • decryption
  • description
Broken into chunks
  • en
    • encode
    • encase
  • crypt
    • cryptic
    • cryptogram
  • ion
    • creation
    • protection
What it sits beside

Same subject

  • cryptography
  • ciphertext
  • key
  • decryption

Same shape

  • decryption
  • encrypting
  • encrypted

symmetric-key algorithms

  • AES
  • ChaCha20

public-key algorithms

  • RSA
  • ElGamal

Where it sits in the deck

Phase 10: Identity, Access, and Cryptographic Foundations

Before examining threats to systems, establish the foundational security primitives — identity, authentication, authorisation, and the cryptography underpinning them.

Neighbours in this phase