SHA-1 Hash of "foo"

SHA-1 Hash

0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33

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Hash result

All Hashes of "foo"

Algorithm	Hash
SHA-1	0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33
MD5	acbd18db4cc2f85cedef654fccc4a4d8
SHA-256	2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
SHA-512	f7fbba6e0636f890e56fbbf3283e524c6fa3204ae298382d624741d0dc6638326e282c41be5e4254d8820772c5518a2c5a8c0c7f7eda19594a7eb539453e1ed7

About SHA-1

SHA-1 produces a 160-bit digest, written as 40 hexadecimal characters. The same input always produces the same hash, while even a one-character change yields a completely different output. This page's hash is exactly 40 characters long, as expected for SHA-1.

Security: SHA-1 is deprecated — a practical collision was demonstrated in 2017 (the SHAttered attack). Avoid it for any new security use; migrate existing systems to SHA-256 or stronger. It is most appropriate for legacy compatibility only, not new security uses.

Can this hash be reversed?

Hashing is one-way — you cannot mathematically reverse a SHA-1 hash to recover its input. However, precomputed (rainbow) tables can simply look up the hashes of common inputs, so a common dictionary word like "foo" should never be used as a password. Strong passwords are long, random, and salted before hashing.

Frequently Asked Questions

What is the SHA-1 hash of "foo"?▾

The SHA-1 hash of "foo" is 0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33.

Is SHA-1 secure?▾

SHA-1 is deprecated — a practical collision was demonstrated in 2017 (the SHAttered attack). Avoid it for any new security use; migrate existing systems to SHA-256 or stronger.

How long is a SHA-1 hash?▾

A SHA-1 hash is 160-bit, which is 40 hexadecimal characters long.

Can a SHA-1 hash be reversed?▾

No. SHA-1 is a one-way function, so a hash cannot be mathematically reversed back to its input. However, hashes of common inputs can be looked up in precomputed (rainbow) tables — which is why a common word like "foo" should never be used as a password.