What is Encryption?
Encryption is the process of converting readable data into unreadable ciphertext using a mathematical algorithm and a secret key. Only someone with the correct key can reverse it and recover the original data, which makes encryption a foundation of protecting information confidentiality.
How does encryption work?
Encryption takes readable information, called plaintext, and uses a mathematical algorithm together with a secret key to scramble it into ciphertext that appears meaningless. The same algorithm, given the correct key, can reverse the process and recover the original data - this reversal is called decryption. The security of the system rests not on hiding the algorithm, which is usually public and well studied, but on keeping the key secret. Without the key, even an attacker who captures the ciphertext cannot read it.
Encryption is applied in two main situations. Data in transit is encrypted as it moves across networks, so anyone intercepting it sees only ciphertext. Data at rest is encrypted while stored, so a stolen device or compromised database does not expose the underlying information.
Why encryption matters
Sensitive data - passwords, payment details, personal information, health records - passes through and rests inside almost every application. If that data is stored or transmitted in plain form, a single breach exposes it entirely. Encryption ensures that intercepted or stolen data remains useless without the key, which limits the damage of a breach and is frequently a legal and compliance requirement. For users, it is the quiet mechanism that lets them trust an application with information they would never share openly.
What are the main types of encryption?
Encryption comes in a few fundamental forms:
- Symmetric encryption - one shared key both encrypts and decrypts; fast and used for bulk data.
- Asymmetric encryption - a public key encrypts and a private key decrypts; used to exchange keys securely.
- Encryption in transit - protects data moving across networks, typically with TLS.
- Encryption at rest - protects stored data on devices, databases and backups.
- Hashing - a one-way transformation used to store passwords; technically distinct but related.
Encryption best practices
Use established, well-tested algorithms rather than inventing your own, because cryptography is extraordinarily easy to get subtly wrong. Encrypt sensitive data both in transit and at rest, since protecting only one leaves a gap. Manage keys carefully - the strongest encryption is worthless if the key is stored insecurely beside the data it protects. Store passwords using a strong hashing function rather than reversible encryption, and keep cryptographic libraries up to date as standards evolve.
How PixelForce approaches encryption
At PixelForce, encryption is built in during Phase 2 - Development and maintained through Phase 3 - Post Launch Support, not bolted on afterwards. Our in-house Adelaide team encrypts sensitive data in transit and at rest as a default, relies on proven algorithms and managed key services rather than custom cryptography, and treats secure key handling as seriously as the encryption itself. This discipline is especially important in regulated and high-trust products such as health and fintech apps. The work sits within our broader enterprise mobile app development security practice, and it is part of building products users can safely trust with their data across the 100+ we have shipped.
Where this applies
The PixelForce services where Encryption matters most - explore how we put it to work in client products.
Frequently asked questions
Symmetric encryption uses a single shared key to both encrypt and decrypt data. It is fast and well suited to encrypting large amounts of data, but both parties must already share the key securely. Asymmetric encryption uses a public key to encrypt and a separate private key to decrypt, which solves the problem of exchanging keys safely. In practice, systems often combine them - asymmetric encryption to share a key, then symmetric encryption for the bulk data.
No. Encryption is reversible: with the correct key, ciphertext can be turned back into the original data. Hashing is one-way, producing a fixed-length value that cannot practically be reversed to recover the input. Encryption protects data you need to read again later, such as a stored message. Hashing suits situations where you only need to verify a value, such as checking a password without ever storing the password itself in readable form.
End-to-end encryption means data is encrypted on the sender's device and only decrypted on the recipient's device, so nobody in between - including the service provider carrying the message - can read it. This contrasts with encryption that protects data in transit but leaves the provider able to access it on their servers. End-to-end encryption offers the strongest confidentiality, which is why it is common in private messaging applications.
Strong, correctly implemented encryption is extremely difficult to break directly, so attackers usually target the weaker links instead - stealing the key, exploiting poor key management, or compromising a device before the data is encrypted or after it is decrypted. This is why secure key handling matters as much as the encryption algorithm itself. Using outdated algorithms or storing keys carelessly is what turns theoretically strong encryption into a practical vulnerability.
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