HC-256
E845873
HC-256 is a high-speed stream cipher designed for software efficiency and strong security, selected as one of the eSTREAM project’s recommended algorithms.
All labels observed (1)
| Label | Occurrences |
|---|---|
| HC-256 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T10168171 — 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: HC-256 Context triple: [eSTREAM, recommendedCipher, HC-256]
-
A.
HC2
The HC2 is a British Royal Air Force variant of the CH-47 Chinook heavy-lift transport helicopter, adapted with specific avionics and equipment for UK operational requirements.
-
B.
HC-4
HC-4 is a model of Coast Guard aircraft used for maritime patrol, search and rescue, and related operational missions.
-
C.
HC3
HC3 is a specialized British Royal Air Force variant of the CH-47 Chinook heavy-lift transport helicopter, configured with advanced avionics and equipment for tactical and special operations.
-
D.
SHA-2
SHA-2 is a family of cryptographic hash functions widely used for data integrity, digital signatures, and security protocols on the internet.
-
E.
SHA-256
SHA-256 is a widely used cryptographic hash function from the SHA-2 family that produces a 256-bit hash value for securing data integrity and authentication.
- 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: HC-256 Target entity description: HC-256 is a high-speed stream cipher designed for software efficiency and strong security, selected as one of the eSTREAM project’s recommended algorithms.
-
A.
HC2
The HC2 is a British Royal Air Force variant of the CH-47 Chinook heavy-lift transport helicopter, adapted with specific avionics and equipment for UK operational requirements.
-
B.
HC-4
HC-4 is a model of Coast Guard aircraft used for maritime patrol, search and rescue, and related operational missions.
-
C.
HC3
HC3 is a specialized British Royal Air Force variant of the CH-47 Chinook heavy-lift transport helicopter, configured with advanced avionics and equipment for tactical and special operations.
-
D.
SHA-2
SHA-2 is a family of cryptographic hash functions widely used for data integrity, digital signatures, and security protocols on the internet.
-
E.
SHA-256
SHA-256 is a widely used cryptographic hash function from the SHA-2 family that produces a 256-bit hash value for securing data integrity and authentication.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
software-oriented cipher
ⓘ
stream cipher ⓘ symmetric-key algorithm ⓘ |
| belongsTo | eSTREAM portfolio ⓘ |
| categoryInESTREAM | software profile ⓘ |
| cipherType | synchronous stream cipher ⓘ |
| competesWith |
Grain
ⓘ
Rabbit ⓘ Salsa20 ⓘ Trivium ⓘ |
| designedFor |
high-speed software encryption
ⓘ
strong security ⓘ |
| designer | Hongjun Wu ⓘ |
| designGoal | simple operations for efficient software implementation ⓘ |
| designPeriod | eSTREAM era ⓘ |
| encryptionMode | XOR keystream with plaintext ⓘ |
| encryptionModel | keystream generator plus XOR ⓘ |
| fieldOfUse |
applied cryptography
ⓘ
information security ⓘ |
| implementationFocus | software on general-purpose CPUs ⓘ |
| IVSize | 256 bits ⓘ |
| keyReuseRequirement | IV must not repeat with same key ⓘ |
| keySetup | expands key and IV into internal state ⓘ |
| keySize | 256 bits ⓘ |
| operationDomain | binary data ⓘ |
| outputGeneration | nonlinear combination of table entries ⓘ |
| outputType | keystream bits ⓘ |
| performanceCharacteristic | high throughput in software ⓘ |
| periodProperty | very large internal state space ⓘ |
| primaryApplication |
high-throughput environments
ⓘ
software encryption ⓘ |
| project |
eCRYPT eSTREAM
ⓘ
linked to:
eSTREAM
|
| securityAssumption | hardness of distinguishing keystream from random ⓘ |
| securityGoal |
long period keystream
ⓘ
resistance to known cryptanalytic attacks ⓘ |
| selectedIn |
eSTREAM project
ⓘ
linked to:
eSTREAM
|
| standardizationStatus | eSTREAM recommended but not an ISO standard ⓘ |
| stateSize | large internal state ⓘ |
| statusInESTREAM | recommended cipher ⓘ |
| supportsIVLength | 256-bit IV ⓘ |
| supportsKeyLength | 256-bit key ⓘ |
| usesOperation |
32-bit word operations
ⓘ
bitwise XOR ⓘ bitwise shifts and rotations ⓘ modular addition ⓘ |
| usesStructure |
pseudorandom table updates
ⓘ
two large internal tables ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: HC-256 Description of subject: HC-256 is a high-speed stream cipher designed for software efficiency and strong security, selected as one of the eSTREAM project’s recommended algorithms.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.