a cryptographic hash function with a 128-bit (16-byte) output, now deprecated

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Does recursive hashing weaken properties of a cryptographic hash algorithm?

Specific example of mine concerns the probability of collision, where I have two plain texts A and B that I want to hash using MD5. Given the cryptographic hash function H and the following: A' = ...
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oclHashcat error messag in Kali Linux

I am in the process of learning oclHashcat syntax. Currently, I am working on breaking a file of md5crypt strings with a dictionary file. The dictionary I am using is rockyou.txt from an installation ...