Can two different strings have same MD5 hash?
Two files can have the same MD5 hash even if there are different. As the MD5 algorithm can take an infinity of input and give a limited number of output, it’s not impossible, even if the probability of collision is very low.
Can two different values have the same hash?
“Two files can have the same md5 hash only if their contents are exactly the same, even a single bit of variation would generate a completely different hash value.” – This is wrong.
Are MD5 values unique?
A hash code (MD5, SHA-1, SHA-256) is of a fixed length, so it cannot be unique for all possible inputs. But all such hash functions are carefully designed to minimize the likelihood of a collision (two distinct files with the same hash value).
Is it possible to have two different messages with same hash value if yes explain how you generate it?
MD5 is not used for such things, it is usually used as a checksum to determine if something has been changed (it’s just a hash). It would be very unlikely that the same data could be changed and produce the same MD5 checksum again.
Can MD5 be duplicated?
A good MD5 hash program will work in unison with the file size, type, and the last byte value. This is because it is common for various parameters of some files to be similar/ identical/ different (size, name etc) but the hash value will always be the same (provided these files are duplicates).
Are all MD5 hashes the same?
Yes, MD5 checksums are platform agnostic and will produce the same value every time on the same file/string/whatever. However, you may want to reconsider your scheme.
What is MD5 in PHP?
Definition and Usage. The md5() function calculates the MD5 hash of a string. The md5() function uses the RSA Data Security, Inc. MD5 Message-Digest Algorithm.
Can MD5 be broken?
The MD5 message-digest algorithm is a cryptographically broken but still widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities.
What should I use instead of MD5?
Probably the one most commonly used is SHA-256, which the National Institute of Standards and Technology (NIST) recommends using instead of MD5 or SHA-1. The SHA-256 algorithm returns hash value of 256-bits, or 64 hexadecimal digits.
Do different files always lead to different MD5 or SHA-1 hash codes?
No they don’t. If you think about it, sha1 output has 160 bits. There are more than 2^160 possible files, therefore there must be multiple (infinitely many) potential files that have the same hashes.