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The '''J1''' cipher, also known by its codename of '''''Nisan''''' (Arabic: نيسان, English: {{wpl|April}}), is a {{wpl|symmetric key}} {{wpl|block cipher}} with a key length of 242 bits and a block size of 36 bits. It was developed by Unit 28 (Cryptography) of the Riysian Air Force Intelligence Directorate (Mukhabarat) as a cipher for the encryption of military, government, and diplomatic teletype and later data networks. The algorithm was issued in 1974, but due to its sensitive nature, it was only declassified in 1998 after it had been superseded by more modern algorithms. It is notable for being the first fully electronic Riysian cipher, and for using a structure similar to an unbalanced Feistel network, considered highly complex in its time.
The '''J1''' cipher, also known by its code name of '''''Nisan''''' (Arabic: نيسان, English: {{wpl|April}}), is a {{wpl|symmetric key}} {{wpl|block cipher}} with a key length of 242 bits and a block size of 36 bits. It was developed by Unit 28 (Cryptography) of the Riysian Air Force Intelligence Directorate (Mukhabarat) as a cipher for the encryption of military, government, and diplomatic teletype and later data networks. The algorithm was issued in 1974, but due to its sensitive nature, it was only declassified in 1998, after it had been superseded by more modern algorithms. It is notable for being the first fully electronic Riysian cipher, and for using a structure similar to an unbalanced Feistel network, which was considered highly complex in its time.
 
==Description==
 
==Cryptanalysis==
 
==Technology/Hardware==
 


[[Category:Air Force Intelligence Directorate cryptography]]
[[Category:Air Force Intelligence Directorate cryptography]]

Revision as of 16:35, 22 May 2018

J1 (Nisan)
General
DesignersAir Force Intelligence Directorate Unit 28
First published1974 (standardized)
1998 (declassified)
Cipher detail
Key sizes242 bits
Block sizes36 bits
StructureUnbalanced Feistel network
Rounds127

The J1 cipher, also known by its code name of Nisan (Arabic: نيسان, English: April), is a symmetric key block cipher with a key length of 242 bits and a block size of 36 bits. It was developed by Unit 28 (Cryptography) of the Riysian Air Force Intelligence Directorate (Mukhabarat) as a cipher for the encryption of military, government, and diplomatic teletype and later data networks. The algorithm was issued in 1974, but due to its sensitive nature, it was only declassified in 1998, after it had been superseded by more modern algorithms. It is notable for being the first fully electronic Riysian cipher, and for using a structure similar to an unbalanced Feistel network, which was considered highly complex in its time.

Description

Cryptanalysis

Technology/Hardware