I was going through the OpenSSL cipher algorithms list. I found these two:


What does that exactly mean? What is the difference between EDE and EDE3? What are the key-size and blocksize of the algorithms?


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I checked https://www.openssl.org/docs/man1.0.2/man1/enc.html and found the following:

des-ede-cbc        Two key triple DES EDE in CBC mode
des-ede3-ofb       Three key triple DES EDE in OFB mode

So, EDE is two-key triple DES, and EDE3 is three-key triple DES. See https://crypto.stackexchange.com/questions/63449/what-is-the-keyspace-of-2-key-3des for the differences between two-key triple DES and three-key triple DES.

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