Is this RSA algorithm?

[Storm Shadow]

you need to DL the yara sigs https://github.com/zerklabs/yarasigs
unpack all to lets say c:\yara . Then edit the
C:\Users\yourfolder\Downloads\ida\ida\plugins\IDAscope\idascope\config.py

line

 "inspection": {
        "default_semantics": "win-ring3"
        },
    "yara": {
        "yara_sigs": ["C:\\yara"]
        }
}

but Yara are for Malware sigs , the crypto search engine is in you picture also .

there are two options to perform crypto search.

I use it to search for s-boxes and other , on Powerpc targets so defently work with linux targets also.