RC2
E113227
RC2 is a symmetric-key block cipher designed by cryptographer Ronald L. Rivest and widely used in early Internet security applications.
All labels observed (2)
| Label | Occurrences |
|---|---|
| RC2 canonical | 1 |
| Rivest Cipher 2 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T963993 — 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: RC2 Context triple: [Ronald L. Rivest, notableWork, RC2]
-
A.
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.
-
B.
Advanced Encryption Standard
Advanced Encryption Standard is a widely used symmetric block cipher standard that secures digital data in applications ranging from wireless networks to government communications.
-
C.
Spritz cipher
Spritz cipher is a modern stream cipher and hash function designed by Ronald Rivest and Jacob Schuldt as a more secure and flexible successor to RC4.
-
D.
Salsa20
Salsa20 is a high-speed stream cipher designed by Daniel J. Bernstein, widely used in modern cryptography for its strong security and efficient software performance.
-
E.
Rabin Square
Rabin Square is a major public plaza in central Tel Aviv, Israel, known as a focal point for political rallies, public events, and memorials, especially in connection with the legacy of Prime Minister Yitzhak Rabin.
- 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: RC2 Target entity description: RC2 is a symmetric-key block cipher designed by cryptographer Ronald L. Rivest and widely used in early Internet security applications.
-
A.
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.
-
B.
Advanced Encryption Standard
Advanced Encryption Standard is a widely used symmetric block cipher standard that secures digital data in applications ranging from wireless networks to government communications.
-
C.
Spritz cipher
Spritz cipher is a modern stream cipher and hash function designed by Ronald Rivest and Jacob Schuldt as a more secure and flexible successor to RC4.
-
D.
Salsa20
Salsa20 is a high-speed stream cipher designed by Daniel J. Bernstein, widely used in modern cryptography for its strong security and efficient software performance.
-
E.
Rabin Square
Rabin Square is a major public plaza in central Tel Aviv, Israel, known as a focal point for political rallies, public events, and memorials, especially in connection with the legacy of Prime Minister Yitzhak Rabin.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
block cipher
ⓘ
symmetric-key algorithm ⓘ |
| alsoKnownAs | ARC2 ⓘ |
| blockSize | 64 bits ⓘ |
| category | symmetric cryptography ⓘ |
| cipherStructure | Feistel network ⓘ |
| designedFor | software implementation ⓘ |
| designer | Ronald L. Rivest ⓘ |
| encryptionType | private-key encryption ⓘ |
| exportControlContext | designed to comply with U.S. export restrictions ⓘ |
| family |
RC5
ⓘ
surface form:
Rivest Ciphers
|
| field | cryptography ⓘ |
| followedBy |
RC4
ⓘ
RC5 ⓘ RC6 ⓘ |
| keyExpansion | complex key schedule with 128-entry table ⓘ |
| keySize |
128 bits
ⓘ
40 bits (export-restricted variant) ⓘ 64 bits ⓘ up to 128 bits ⓘ |
| leakedBy | anonymous Usenet posting ⓘ |
| leakYear | 1996 ⓘ |
| namedAfter |
RC2
self-linksurface differs
ⓘ
surface form:
Rivest Cipher 2
|
| operatesOn | 64-bit data blocks ⓘ |
| precededBy | RC1 ⓘ |
| published | 1996 ⓘ |
| recommendedUsage | avoid in new systems ⓘ |
| rounds | 18 ⓘ |
| standardizedIn | RFC 2268 ⓘ |
| status | considered obsolete ⓘ |
| supersededBy |
3DES
ⓘ
Advanced Encryption Standard ⓘ
surface form:
AES
|
| supportsVariableKeyLength | true ⓘ |
| usedFor |
Internet security protocols
ⓘ
data confidentiality ⓘ email encryption ⓘ |
| usedIn |
PKCS #12
ⓘ
S/MIME ⓘ early SSL implementations ⓘ early TLS implementations ⓘ |
| usesLookupTable | true ⓘ |
| usesVariableNumberOfRounds | true ⓘ |
| vulnerableTo |
brute-force attacks on short keys
ⓘ
related-key attacks ⓘ |
| wasInitiallyKeptSecret | true ⓘ |
| wasProprietary | true ⓘ |
| yearDesigned | 1987 ⓘ |
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: RC2 Description of subject: RC2 is a symmetric-key block cipher designed by cryptographer Ronald L. Rivest and widely used in early Internet security applications.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Rivest Cipher 2