> For the complete documentation index, see [llms.txt](https://docs.editran.onesait.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.editran.onesait.com/documentacion-editran/ibm-editran-v5.3-cics-en/utilities-and-codes/appendix-d.-cryptography-system-in-onesait-editran/final-recommendations-for-cryptography.md). # Final recommendations for cryptography For all these reasons, it is recommended to use the exchange key management application for exchanges (interface and parameters) and also to use TRIPLE DES in the operational DES key (confidentiality) and RSA key in the exchange key (authentication), since this is clearly the most secure cryptographic system presented: * In editran, indicate (X and Y are the subsystems that are defined) ``` | CRYPTOGRAPHY (Y/N).......: S | | CRYPTOGRAPHIC VERSION......: 4 00 | | DATA ENCRYPTION ALGORITHM.: AES1 AUTHENTICATION ALGORITHM ...: RSA | | LOCAL SUBSYSTEM...........: X REMOTE SUBSYSTEM..........: Y | | LOCAL KEY: | | REMOTE KEY: | ``` If a table had to be prepared based on the security of the cryptographic system used, from lowest to highest, indicating the requirements:


Cryptography type	Requires DES	Requires RSA	Exchanged keys without exchange key management	Exchanged keys with exchange key management	Drawbacks
Version 3.00, DES authentication, TD3C confidentiality	X		X		DES exchange key in clear text
Version 3.00, DES authentication, TD3C confidentiality	X	X		X	It is better to exchange RSA keys
Version 3.00, RSA authentication, TD3C confidentiality	X	X	X		Better to use exchange key management
Version 3.00, RSA authentication, TD3C confidentiality	X	X		X
Version 4.00, RSA authentication, AES1 confidentiality	X	X	X		Better to use exchange key management
Version 4.00, RSA authentication, AES1 confidentiality	X	X		X	Better to use TD3C confidentiality
Version 4.00, RSA authentication, AES2 confidentiality	X	X	X		Better to use exchange key management
Version 4.00, RSA authentication, AES2 confidentiality	X	X		X	Better to use TD3C confidentiality
Version 4.00, RSA authentication, AES3 confidentiality	X	X	X		Better to use exchange key management
Version 4.00, RSA authentication, AES3 confidentiality	X	X		X

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