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11-05-2019 07:32 PM
Quoting from the docs for Define IPSec Crypto Profiles, it says
For the authentication algorithm, use SHA-256 or higher (SHA-384 or higher preferred for long-lived transactions). Do not use SHA-512, SHA-1, or MD5.
Whereas, going from most to least secure, it recommends the below order
Authentication—sha512, sha384, sha256, sha1, md5.
Can someone please help clarify what is right or wrong ? Thanks!
11-06-2019 05:28 AM
@devd_25 Anything from SHA256 and above is secure. To use SHA-512 or SHA-384, you need to have compatible servers and are not widely used. Other reasons include processing time. Following public links can add some more info
https://security.stackexchange.com/questions/165559/why-would-i-choose-sha-256-over-sha-512-for-a-ss...
https://automationrhapsody.com/md5-sha-1-sha-256-sha-512-speed-performance/
11-05-2019 11:48 PM
@devd_25 The second line shows what is supported on the firewall and the first what is recommended to use.
11-06-2019 05:28 AM
@devd_25 Anything from SHA256 and above is secure. To use SHA-512 or SHA-384, you need to have compatible servers and are not widely used. Other reasons include processing time. Following public links can add some more info
https://security.stackexchange.com/questions/165559/why-would-i-choose-sha-256-over-sha-512-for-a-ss...
https://automationrhapsody.com/md5-sha-1-sha-256-sha-512-speed-performance/
11-07-2019 12:24 AM
Hi @BatD , thats right. However, if you notice, first it says
Do not use SHA-512, SHA-1, or MD5.
Then, it recommends in the order of most to least secure starting with SHA-512, implying that SHA-512 is most secure. Hence, needed clarification on that. Might be a documentation error.
11-07-2019 12:32 AM
@devd_25 This is correct, SHA-512 is indeed the most secure, but not recommended for reasons mentioned by @Sai_Tumuluri - processing resources, comapability, etc.
11-08-2019 08:29 AM
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