DataTerminology.comNEW
Also known as: Cleartext
Unencrypted, readable information before encryption or after decryption.
DESCRIPTION
Plaintext is the original, intelligible data in a cryptographic context. It becomes ciphertext after encryption and is restored to plaintext through decryption. Correct handling of plaintext is critical for security, including secure memory practices, key management, and minimizing exposure. In secure systems, plaintext of sensitive data is kept transient and protected through encryption at rest and in transit. Developers and security engineers must avoid logging or caching plaintext credentials and personal data.
ALTERNATIVE DEFINITIONS
IETF RFC 4949 (Internet Security Glossary, Version 2)
plaintext: Data in clear form; not encrypted.
Concise emphasis that plaintext is data not in encrypted form.
NIST Computer Security Resource Center
Plaintext: Unencrypted information that is input to and output from a cryptographic algorithm.
Highlights plaintext as both input and output around cryptographic processing.
Wikipedia
In cryptography, plaintext is the message to which an algorithm is applied, which is transformed into ciphertext by encryption and back into plaintext by decryption.
Frames plaintext in the encryption–decryption lifecycle.
RELATED TERMS
Data Encryption Decryption Symmetric Encryption Asymmetric Encryption Cryptographic Key Symmetric Block Cipher Algorithms Stream Cipher Hash Function Key Management
COMPETING TERMS
KNOWLEDGE AREAS
Data Security Data Privacy & Compliance Infrastructure
TARGET AUDIENCE
Security Architect Cybersecurity Engineer Chief Information Security Officer Data Privacy Officer Software Developer
EXTERNAL SOURCES
- Wikipedia - Plaintext
- NIST CSRC - Authoritative glossary entry
- IETF - Internet Security Glossary definition
- OWASP - Guidance avoiding plaintext storage
TOP QUESTIONS
What is Plaintext in cryptography?
Plaintext is readable information before encryption or after decryption. It is the data that encryption algorithms transform into ciphertext.
Category: Definition
Why is handling Plaintext risky?
Exposure of plaintext leaks sensitive information. Logging, caching, or transmitting plaintext without protections can lead to breaches.
Category: Risks
How should Plaintext be protected in applications?
Encrypt at rest and in transit, avoid storing secrets in plaintext, and prevent plaintext in logs. Use secure memory practices and proper key management.
Category: Best practices
Is Plaintext the same as Cleartext?
Yes, the terms are often used interchangeably, both referring to unencrypted readable data.
Category: Misunderstanding
What is a common mistake with Plaintext in databases?
Storing passwords or tokens in plaintext instead of using salted hashing or encryption is a serious error.
Category: Mistakes
How does Plaintext relate to Ciphertext?
Plaintext is the original readable form; ciphertext is the encrypted form. Decryption converts ciphertext back to plaintext.
Category: Concepts
Which standards mention Plaintext?
IETF RFC 4949 and NIST glossaries define plaintext and its role in cryptographic processing.
Category: Standard
Can Plaintext be safely transmitted over networks?
Only if protected by secure protocols like TLS that encrypt data in transit. Otherwise, plaintext can be intercepted.
Category: Requirements
What tools help minimize Plaintext exposure?
Secrets managers (e.g., HashiCorp Vault), TLS, envelope encryption, and DLP tools reduce plaintext exposure.
Category: Tools