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I have been researching but I am clueless. I know that MD5 can have both numbers and letters but if I ever find a case where an MD5 has only numbers or only letters it breaks my script currently
512
MD5 (Message-Digest algorithm 5) is a widely used cryptographic hash function that results in a 128-bit hash value. The 128-bit (16-byte) MD5 hashes (also termed message digests) typically are represented as 32-digit hexadecimal numbers (for example, ec55d3e698d289f2afd663725127bace).
Each MD5 hash looks like 32 numbers and letters, but each digit is in hexadecimal and represents four bits. Since a single character represents eight bits (to form a byte), the total bit count of an MD5 hash is 128 bits.
MD5 and SHA hashes in raw form are binary, however their common representation is a hex-encoded string, which contains characters [a-fA-F0-9] . So if this is what you meant, then characters G-Z, g-z are "excluded". Another, less common, representation is Base64 encoding [0-9a-zA-Z+/].
MD5 yields hexadecimal digits (0-15 / 0-F), so they are four bits each. 128 / 4 = 32 characters.
List of few first strings that give only-digit md5 hash:
ximaz : 61529519452809720693702583126814
aalbke : 55203129974456751211900188750366
afnnsd : 49716523209578759475317816476053
aooalg : 68619150135523129199070648991237
bzbkme : 69805916917525281143075153085385
Here's one with only letters:
cbaabcdljdac : cadbfdfecdcdcdacdbbbfadbcccefabd
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