CAST5

E184258

Feistel network cipher block cipher symmetric-key algorithm

CAST5 is a symmetric-key block cipher widely used for encryption in security protocols and applications such as PGP.

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All labels observed (8)

Label	Occurrences
CAST-128	6
CAST5 canonical	3
CAST family of block ciphers	2
CAST-5	2
CAST block cipher family	1
CAST encryption algorithm	1
CAST family of ciphers	1
CAST-128 cipher	1

How this entity was disambiguated

This entity first appeared as the object of triple T1635054 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: CAST5
Context triple: [PGP, supportsAlgorithmType, CAST5]

A. RC5
RC5 is a symmetric-key block cipher designed by cryptographer Ronald L. Rivest, known for its simplicity, parameter flexibility, and use in various encryption applications.
B. Rijndael
Rijndael is a symmetric block cipher designed by Joan Daemen and Vincent Rijmen that was selected by NIST as the basis for the Advanced Encryption Standard (AES).
C. RC4 stream cipher
The RC4 stream cipher is a once-widely used symmetric key algorithm known for its simplicity and speed in software, but now considered insecure due to multiple discovered vulnerabilities.
D. RC6
RC6 is a symmetric block cipher designed as a candidate for the Advanced Encryption Standard (AES), known for its simplicity, efficiency, and parameterized structure.
E. SDES
SDES (Session Description Protocol Security Descriptions) is a key management mechanism used to negotiate and convey cryptographic parameters for securing media streams in real-time communication protocols.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: CAST5
Target entity description: CAST5 is a symmetric-key block cipher widely used for encryption in security protocols and applications such as PGP.

A. RC5
RC5 is a symmetric-key block cipher designed by cryptographer Ronald L. Rivest, known for its simplicity, parameter flexibility, and use in various encryption applications.
B. Rijndael
Rijndael is a symmetric block cipher designed by Joan Daemen and Vincent Rijmen that was selected by NIST as the basis for the Advanced Encryption Standard (AES).
C. RC4 stream cipher
The RC4 stream cipher is a once-widely used symmetric key algorithm known for its simplicity and speed in software, but now considered insecure due to multiple discovered vulnerabilities.
D. RC6
RC6 is a symmetric block cipher designed as a candidate for the Advanced Encryption Standard (AES), known for its simplicity, efficiency, and parameterized structure.
E. SDES
SDES (Session Description Protocol Security Descriptions) is a key management mechanism used to negotiate and convey cryptographic parameters for securing media streams in real-time communication protocols.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	Feistel network cipher ⓘ block cipher ⓘ symmetric-key algorithm ⓘ
alsoKnownAs	CAST encryption algorithm ⓘ linked to: CAST5 CAST-128 ⓘ linked to: CAST5
bitOperations	uses S-box substitutions ⓘ uses XOR ⓘ uses modular addition ⓘ
blockSize	64 bits ⓘ
cipherStructure	Feistel network ⓘ
countryOfOrigin	Canada ⓘ
designedBy	Carlisle Adams ⓘ Stafford Tavares ⓘ
designedByOrganization	Entrust Technologies ⓘ
designedFor	data encryption ⓘ
designedToResist	differential cryptanalysis ⓘ linear cryptanalysis ⓘ
hasSBoxes	true ⓘ
keySchedule	complex key-dependent subkeys ⓘ
keySize	128 bits ⓘ 40 bits ⓘ 80 bits ⓘ variable key size from 40 to 128 bits ⓘ
modeOfOperationSupport	CBC ⓘ CFB ⓘ ECB ⓘ linked to: European Central Bank OFB ⓘ
numberOfRounds	12 ⓘ 16 ⓘ
patentStatus	patents have expired ⓘ was patented ⓘ
primaryApplicationDomain	software encryption ⓘ
relativeAge	older-generation block cipher ⓘ
replacedByInNewSystems	AES ⓘ linked to: Advanced Encryption Standard
roundsDependOnKeySize	true ⓘ
sBoxCount	4 ⓘ
securityLevel	considered secure for many legacy applications ⓘ
specifiedIn	OpenPGP standard ⓘ linked to: RFC 4880
standardizedIn	RFC 2144 ⓘ
successorAlgorithm	CAST-256 ⓘ linked to: CAST6 CAST6 ⓘ
supports	confidentiality ⓘ
typicalImplementation	software-oriented design ⓘ
usedIn	GnuPG ⓘ linked to: GNU Privacy Guard OpenPGP ⓘ linked to: RFC 4880 PGP ⓘ security protocols ⓘ
yearDesigned	1996 ⓘ

How these facts were elicited

Referenced by (17)

Full triples — surface form annotated when it differs from this entity's canonical label.

PGP → supportsAlgorithmType → CAST5 ⓘ

CAST5 → alsoKnownAs → CAST-128 ⓘ

linked to: CAST5

CAST5 → alsoKnownAs → CAST encryption algorithm ⓘ

linked to: CAST5

Feistel network → usedBy → CAST-128 ⓘ

linked to: CAST5

S-box → usedInCipher → CAST-128 ⓘ

linked to: CAST5

Carlisle Adams → knownFor → CAST-128 cipher ⓘ

linked to: CAST5

Carlisle Adams → developed → CAST-128 ⓘ

linked to: CAST5

Carlisle Adams → notableConcept → CAST family of block ciphers ⓘ

linked to: CAST5

Stafford Tavares → knownFor → CAST block cipher family ⓘ

linked to: CAST5

Stafford Tavares → knownFor → CAST-128 ⓘ

linked to: CAST5

Stafford Tavares → coDesignerOf → CAST-128 ⓘ

linked to: CAST5

Stafford Tavares → coDesignerOf → CAST family of block ciphers ⓘ

linked to: CAST5

Stafford Tavares → coDesignerOf → CAST-5 ⓘ

linked to: CAST5

Stafford Tavares → knownFor → CAST-5 ⓘ

linked to: CAST5

CAST6 → hasPredecessor → CAST5 ⓘ

RFC 2144 → specifies → CAST5 ⓘ

RFC 2144 → relatedWork → CAST family of ciphers ⓘ

linked to: CAST5

All labels observed (8)

How this entity was disambiguated Show

Statements (48)

How these facts were elicited Show

Referenced by (17)

How this entity was disambiguated

How these facts were elicited